1966 Disc Brake Conversion Questions

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Fryer1979

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As a new MOPAR owner/builder, my experiences in building these cars just aren't up to par yet. So that leaves me with a few questioms maybe you more experienced fellers can help me with. The main question I have at the moment is convertimg the front dru,s on my 66GT to discs. I know there are probably a handfull of aftermarket kits available, but I'm a bit on a budget and I prefer to build things using parts from other cars. I frequemt local salvage yards quite a bit, so I am wondering if there are vehicles I can be keepimg an eye out for to get parts I need to convert? What other vehicles will work, and what parts do I need to find? My buddy and I have discussed using and adapting the full discs from a 4 wheel disc pt cruiser, and we may try that route...I just want to see if you all know of something else out there I can find that might work better. Thanks guys!
 
The big question is whether or not you want to keep your 5 on 4" bolt circle wheels. If you do, there are a couple of options. One option would be to find a '66 to '72 A body with front disc brakes and get the spindles, calipers, and rotors from it. These are getting scarce, parts are hard to find, and they tend to be a little pricey. The other option is to get a Scarebird conversion kit. There are kits to convert either 9" drums or 10" drums. What you get in the basic kit is a set of caliper brackets that bolt to your drum spindles and a parts list/instruction sheet. You will need to press the hubs out of your existing drums and bolt the brackets to your spindles. You will need to come up with a pair of Celebrity calipers, Cadillac brake hoses, and a set of Toyota Previa rotors. The rotors need to be redrilled for the 5 on 4" bolt pattern. The Scarebird kit goes for around $150 and has all the special parts you will need to make this work and some pretty good instructions. Either of these brake setups will also require 14" wheels, a proportioning valve, and a dual disc/drum master cylinder.

If you can find a '73-'76 A body with disc brakes in a local yard, grab the upper control arms, spindles, rotors, lower ball joints, and calipers. These will swap directly onto your '66 and give you good braking. You can also get the spindles, calipers, and rotors from an F,M,J body (Aspen, Volare, Diplomat) but these will require the upper control arms from a '73-'76 A body as well as the lower ball joints and brake hoses. Both of these swaps will require 14" wheels, a proportioning valve, a dual master cylinder, and have a 5 on 4.5" bolt circle.

I'm sure I left something out, but it is getting late here in Southern Siberia and this will cover the basics. Good luck with your build.
 
As mentioned, the Scarebird approach is easiest and probably cheapest. If you go with the 73+ swap, you will also need to change your rear-end to 5x4.5 ($$$), or carry 2 spare tires. For more money, you can purchase everything from Scarebird, but cheaper to source at your local store or JY. Other kits start ~$700 (Wilwood, SSBC, ...). Some require 15" wheels. Many people run front disks with a manual MC ~7/8"D. For cheap power brakes, lookup my post using a booster/MC from a 98 Breeze.
 
I did the swap from a 73 Dart Swinger 904/318 car I bought for $500.I even used the 904/7 1/4 driveshaft when I installed the 8 3/4 in my 66 Dart(now a Dana60).See if you can find a complete donor car for all your needs.
 
If you're not worried about the bolt pattern you can grab all the brake stuff off of an F/M/J body from the local wrecking yard. Just take the spindles on out, you get the spindles, caliper brackets, calipers, and rotors (if they're any good). The 10.87" brake set up came on F/M/J bodies all the way up to 1989. You'd still need lower ball joints for a '73-76 A body, and either '73-'76 upper control arms, or Dr. Diff's ball joint adapter sleeves. I'd guess that you could get the master cylinder and brake distribution block from the same donor.

Check your local parts houses for their core prices, sometimes its cheaper and easier to just pay the core charges for the calipers, unless you find a pair that you're willing to run as is. Around here the core charge is pretty much the same as the price at the yard, so I just buy new calipers for peace of mind. Same on the rotors, unless you find a really clean pair at the yard its easier just to buy new stuff. Then you just need the spindles, caliper brackets, and distribution block from the yard, and just source the calipers, rotors and m/c locally or online. RockAuto has pretty good prices on most of that stuff.

There are a TON of threads on this conversion. In fact, if you REALLY want to narrow things down, just search my posts for "disk brake swap". I think I've commented on threads like this at least a few dozen times... :wink:
 

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I'd go the 73-76 disc set up. Did the same swap on my dad's 64 Valiant with no modification at all for less than $500. I could not belive how big of a difference the braking power was between disc and drum in that car.
 
Note the scarebird option requires 14 x 5.5 wheels.....14 x 4.5 wheels rub on the calipers.
 
66 and up disk changeover stuff. You can even use your old 65 LBJ's if you drill out the 1/2 bolt hole to 9/16. Spindle, rotors and calipers, dual M/C and your almost done. Just a prop/combo valve and some brake fittings.
 
Awesome guys, thanks a lot for all of the information. I'm sorry if my question has been asked and answered several times over. I read through several pages of passed threads and didn't find one specifically asking or answering my question, and since my time I can be online is severly limited (no internet or computer at home), I figured I would just post a new thread. All of the info provided is exactly what I needed, so now I know what to look for in the yards. I know all of the interchanges for Fords and Chevys pretty well, but just wasn't too familiar with MOPARs yet. So thanks again for all the time and information! :supz: :D
 
And by the time you do all that you could have bought the kit with all the parts included and been done! For just about the same price with all new parts, new rotors and simply put correct fit first time no muss no fuss! Done it on my 65 formula s and love every time I hit the brakes! Dual master cylinder now and 14 inch wheels front and back! Simple and safe! Dont mess with what makes the car stop and be safe on the road!!!

65 Cudalover!
 
And by the time you do all that you could have bought the kit with all the parts included and been done! For just about the same price with all new parts, new rotors and simply put correct fit first time no muss no fuss! Done it on my 65 formula s and love every time I hit the brakes! Dual master cylinder now and 14 inch wheels front and back! Simple and safe! Dont mess with what makes the car stop and be safe on the road!!!

65 Cudalover!

I'm not to happy with the kit's(wildwoods, can't say about the others). we got a wildwood complete kit for a 65 plymouth B body. all was great when it was new. but my friend does happen to like driving his cars. so 10k later he's got to replace the pads and rotors???
He calls and finds out that it's almost as expensive to replace the rotors an pads as it is to change over to a scarebird setup. 2 guesses what he did. now after 28k on the scarebird conversion he's going to change the rotors,pads and calipers for about 125.00. (smaller rotors and calipers but it stops just as good)I did tell you he likes to drive the car didn't I? he's went on the last 3 power tours and just plian likes driving that big B body.

I went the scarebird way on my dart but haven't got it on the road yet and it'll be a driver too!
 
And by the time you do all that you could have bought the kit with all the parts included and been done! For just about the same price with all new parts, new rotors and simply put correct fit first time no muss no fuss! Done it on my 65 formula s and love every time I hit the brakes! Dual master cylinder now and 14 inch wheels front and back! Simple and safe! Dont mess with what makes the car stop and be safe on the road!!!

65 Cudalover!

What do ya do if ya don't have cubic dollars? Some of us have to use our brains instead of our wallets.
 
What do ya do if ya don't have cubic dollars? Some of us have to use our brains instead of our wallets.

well by the time you buy spindles from a parts car; and try and round up all the parts needed to do the conversion, you'll end up with mostly new anyway so why not go with scarebird? you can have a complete new over the counter brake setup for under $500 and well under that if you price around
 
well by the time you buy spindles from a parts car; and try and round up all the parts needed to do the conversion, you'll end up with mostly new anyway so why not go with scarebird? you can have a complete new over the counter brake setup for under $500 and well under that if you price around

the newest design works on 9 or 10 inch spindles just by flipping sides. I'm not sure if they still have the 14 problem size. I have 14 inch rallies on mine but don't remember the width.
Actually you can use your existing spindles. that's what made me choose scarebird in the first place I had the hubs redrilled to 5 on 4.5 (or you could redrill the rotors to 5 on4.0 to use the existing tires and rims)so I could use the new rotors without having to redrill them every time I had to put new rotors on. 6 of 1, half dozen of the other your choice.

I paid 18.00 per caliper(napa)............ ................36.00 you can get at any parts store
28.00 per rotor.(advanced auto)...........................56.00 "you can get at any parts store
the adapter plates............................................109.00 scarebird
front hoses 19.00 per side(advanced auto)...........38.00 "you can get at any parts store
master cylinder (rock auto)(advanced auto)...........13.00 "you can get at any parts store
proportioning valve (used)...................................5.00 "on this site"
1 new brake line 8.00 for MC(advanced auto) .........8.00 "you can get at any parts store
rear rubber hose 27.00(advanced auto) ................27.00 "you can get at any parts store
pads non ceramic 13.00(advanced auto)...............13.00 "you can get at any parts store
rear cylinders 10.50(advanced auto).....................21.00 "you can get at any parts store

I'm right about 326.00 for all new. except spindles which are original
ahh forgot the redrilling of the hub that did cost me 40.00 to get them done and 22.50 for 2 inch long 1/2-20 studs.
soooo
326 +40+22.50 = 388.50 for a conversion I can go to any parts store and repair.

oh yeah I forgot to mention that once you get the adapter plates you can get the rest of the stuff at your on pace or budget so 109.00 initial cost(Might have gone up to 115.00)
and the rest as you have money.
 
So 66Dvert you paid just as much or more than I did for a simple kit and still need or needed to replace the brake lines which cost how much more? I replaced all the brake lines also as to be safe and now driving a car with a dual master cylinder system needs seperate front and rear brake lines. Correct? One can do it either way, but in todays world I would rather do it right the first time than have to do it again and spend the money twice. Not here to argue or say you are incorrect, we all have different ability and ideology, I am a keep it simple stupid person so I like a kit to help ME do it right the first time! Just my own opinion! KISS methodology specialist aqui! Oh Mi Habla espanol por trabajen con mis amigos tambien!

65Cudalover
 
So 66Dvert you paid just as much or more than I did for a simple kit and still need or needed to replace the brake lines which cost how much more? I replaced all the brake lines also as to be safe and now driving a car with a dual master cylinder system needs seperate front and rear brake lines. Correct? One can do it either way, but in todays world I would rather do it right the first time than have to do it again and spend the money twice. Not here to argue or say you are incorrect, we all have different ability and ideology, I am a keep it simple stupid person so I like a kit to help ME do it right the first time! Just my own opinion! KISS methodology specialist aqui! Oh Mi Habla espanol por trabajen con mis amigos tambien!

65Cudalover

not to start a pissing match. or piss off anyone. if "ya gots" the checkbook and want it go for it. I've been wrenching for over 45 years so I went the other way.
I was disappointed with the wildwood setup and quality on my friends 65 that I put on for him. over a grand for the kit. and the summit kit for his camaro was cheap @ 459.00. (still worried about his rotors and pads though). it had cheap bolts I had to upgrade all the connecting hardware to grade 8. works ok, but it's a trailer queen. less that 1500 miles on it in 3 years.
but if that what you like to do go for it.
and I'm not having to do it a second time. it'll be right the first time but take a little longer because of the money budget.

I went the scarebird route due to not having a large budget every month to get parts with. and I'm not to worried about all mopar parts only. My theory is if I have a mopar car and engine with toyota/chevy/yugo whatever parts on it that works and is safe or makes it stop or go better I'm all for it since I know I can get the parts (maybe not yugo parts) almost anywhere.
of course you are not mopar only with a kit either.

and cost's almost as much as the Kits,sort of.(wanna tell me where you got a kit for 330 or so?heck 380 woulld be killer too!) I can sell em all day long at that price! summits was the cheapest that I saw starting at 459.00. (yep you had to buy lines there too!,so add cost) but that was for a chevy(camaro kit, see above statement about kit). as for doing it right , if you look at the kits you'll see that the adapter looks like a scarebird adapter. rotors are rotors,unless you want bling or huge (really on a small a body?) I can haul the 65 plymouth B Body with a built 440@3500lbsor so down from 120 in nothing flat using scarebirds with the 11 inch previa rotors and celebrity calipers and pads and it stops straight MULTIPLE times. anything bigger for an mildly modded small block or big block is just bragging.
Calipers. well yeah I didn't get dual pucks like the wildwoods. but a few million chevy's out there with the same calipers can't be that unsafe or wrong, can it? yeah I know chevy and previa parts, but where did wildwood and summit get their rotors and caliper design from? chevy!
rubber hoses I'll put new on any car I drive. just cause.

proportioning valve? I got a disc/drum one for a small A body so it has the correct bias. I also have set up adjustable valves(a little touchy to adjust right) and either work good.
dual master cylinder ummm if memory serves me right you had a single pot on the 65 didn't ya? so you had to change to a dual also in the kit(wildwood did have the extra line but for a grand it better have). I just have a choice of how hard I want the pedal to be. big or small bore.(no choice in the kit) same with the rear wheel cylinders. I wanted safe and was able to choose the rears to suit the car's actions.(dang you didn't get that in the kit did ya. let me remove the prices for the rear rubber and wheel cylinders) remember safety first! so take away 45-50 or so for the rear rubber hose and wheel cylinders and I'm in the lower 300 mark. there isn't a kit out there that you can get for lower 300 mark. even scarebirds kit costs more @ 495.00 complete.

yeah I ordered new lines but didn't need to since the lines had been replaced by the previous owner with SS lines(those go on the wife's dart, I get regular steel lines that I coated with clear)
actually when I added the dual pot MC all I did was remove the existing distribution block and put in the new(used) prop valve and added a short line(looped) from the master cylinder to it. (done deal!) total cost of 23 inch line $8.00. I'll eat that extra cost all day long. even if you do an adjustable prop valve you only need a short one to run from the new master cylinder to the prop valve that's connected to your rear line. maybe a 32 incher looped to fit cost maybe $12.00 or so.

the kit that would fit mine cost $746.00 on sale from $849.00 that extra 280(330 or so if you don't add in rear wheel stuff) or so can go into other parts. only converts to 5 on 4.5 so you DON'T have a choice to stay small bolt pattern. oh yeah you STILL gotta order replacement rotors/pads from summit and I have not been able to price out them yet(found em $133.00 VS $28.00 (mine)for rotors SBBC, not found the pads yet). that means wait time and the car's going to be sidelined until you get the parts from them.

BUT I can go to a parts store and get replacement parts anywhere in the US pretty much for all the parts for the scarebird setup. again since I'm going to be driving this car as much as I can and it will go on a power tour or 2 along with a couple of 1200 mile trips from Florida to Michigan and then to Oklahoma,Texas and Vegas I want an easily repairable car.
just my take on the situation. I like the KISS solution also.
pro's for me were
1. I didn't have to change my spindles or upper control arms (did put on new front suspension just cause it OLD!)
2. can use with 9 or 10 inch drum brakes.
3. I can go to any parts store and get replacement parts CHEAPER
4. choice of SBP or LBP.(drill hub's for LBP once or rotors each time for SBP when replacing rotors)
5. choice of stopping performance (hard pedal,soft pedal,ceramic pads , larger or smaller bore rear wheel cylinders ect..)
6. can be bought in stages when money is available.
7. the newer adapter and pieces fit inside a factory steel rim. my stock 14's SBP would have just barely(yeah really close as in paper clearance width) cleared them if I had stayed SBP
Con's
against it for me were
1. I had to drill my hub for the large bolt pattern front and rear. total cost for drilling hubs and axles was 97.50. $40 for the front and $57.50 for the rear.
2. I had to file off a little casting from the calipers(only one side for some reason the other cleared).

win/win for my situation. others may vary
again if you have the money for a kit go for it, if you want a kit go for it. if you want huge calipers and rotors go for it. but as for safe and right either way works and works well.
 
Subscribed and rated this great info ,, Thank you EVERYONE
 
I happened to get a copy of Muscle car review from my mechanic at the golf course, who happens to be a drag racer/old car lover. He runs a very fast 8 second chevy but works on many mopars also! He handed me this magazine and there on the back I see the kit I used for both my brakes and front end restoration! It comes from PST Performance Suspension Technology WWW.p-s-t.com check them out! Simple all the parts you need, help and it works great! Done it twice like I said before on my 66 and now my 65 Cudas! They also got leaf spring kits other goodies you might need and were very helpful when I needed them the first time on my 66! It may cost a little more for new parts, but do it once and do it right, then never do it again, drive it and enjoy it! Mopar or No Car!

65CudaLover Gregg
 
I happened to get a copy of Muscle car review from my mechanic at the golf course, who happens to be a drag racer/old car lover. He runs a very fast 8 second chevy but works on many mopars also! He handed me this magazine and there on the back I see the kit I used for both my brakes and front end restoration! It comes from PST Performance Suspension Technology WWW.p-s-t.com check them out! Simple all the parts you need, help and it works great! Done it twice like I said before on my 66 and now my 65 Cudas! They also got leaf spring kits other goodies you might need and were very helpful when I needed them the first time on my 66! It may cost a little more for new parts, but do it once and do it right, then never do it again, drive it and enjoy it! Mopar or No Car!

65CudaLover Gregg
I was on the P-S-T web site for a while searching for the cheapest kit that would convert to disc without changing spindles or just convert any way and work, would you post a part number for the kit you used? I couldn't find any kit less than 599 (that was for rear wheel disc conversion). most kits for the mopars ran between 999.00 and up. so I'm curious as to what part number you got for 3-400 or so. I have a friend thats going to do a conversion on his 69 charger and he's interested in this kit you found. oh and I did use all new parts Except the proportioning valve. that was used but a new one would have cost 35.00 from summit or jegs.
 
It's not hard to source the parts for the later Mopar swap. An hour or less in the yard gets you everything you need off an F/J/M body except for the UCA's and lower ball joints. If you buy new rotors, calipers, and hoses even faster, since you don't need to pull those parts.

Heck, you can go on RockAuto and source the master cylinder, rotors, calipers, and hoses. Using their current prices for '73-'76 A body disk brake parts...

M/C- $11.23
Rotors- $36.79 each
Calipers- $39.28 (includes a $20 core) each
hoses- $5.88 each
pads (semi-metallic)- 7.12
lower ball joint- 17.20 (each)

So that's $223.77+ shipping. Last set of spindles and caliper brackets I got from the yard were $60. Throw in the brake block, we'll even call that $20. So now you're at $303.77. Buy a set of ball joint sleeves from Dr. Diff and re-use your UCA's, $50.

So, $353.77 + shipping from RockAuto. Everything but the spindles and the brake block were ordered new, and you've got Mopar LBP brakes, just like the factory. No chevy parts, no extra machining, everything can be had from the local Napa in a pinch. I don't understand why you'd want to buy a kit to put chevy parts on your Mopar when you can get the Mopar parts for the same price, and that's using all NEW parts except for the spindles and brake block. Find decent parts in the yard and you can start subtracting costs.

AND, if you get really lucky and find a B/R/M body out there, you can have 11.75" rotors, same price for everything. Or, spend an extra $100 and order the 11 3/4 caliper brackets from Dr. Diff new.
 
Also, replacing the spindles and UCA forces most people to change out worn and damaged bushings and ball joints.
 
It's not hard to source the parts for the later Mopar swap. An hour or less in the yard gets you everything you need off an F/J/M body except for the UCA's and lower ball joints. If you buy new rotors, calipers, and hoses even faster, since you don't need to pull those parts.

Heck, you can go on RockAuto and source the master cylinder, rotors, calipers, and hoses. Using their current prices for '73-'76 A body disk brake parts...

M/C- $11.23
Rotors- $36.79 each
Calipers- $39.28 (includes a $20 core) each
hoses- $5.88 each
pads (semi-metallic)- 7.12
lower ball joint- 17.20 (each)

So that's $223.77+ shipping. Last set of spindles and caliper brackets I got from the yard were $60. Throw in the brake block, we'll even call that $20. So now you're at $303.77. Buy a set of ball joint sleeves from Dr. Diff and re-use your UCA's, $50.

So, $353.77 + shipping from RockAuto. Everything but the spindles and the brake block were ordered new, and you've got Mopar LBP brakes, just like the factory. No chevy parts, no extra machining, everything can be had from the local Napa in a pinch. I don't understand why you'd want to buy a kit to put chevy parts on your Mopar when you can get the Mopar parts for the same price, and that's using all NEW parts except for the spindles and brake block. Find decent parts in the yard and you can start subtracting costs.

AND, if you get really lucky and find a B/R/M body out there, you can have 11.75" rotors, same price for everything. Or, spend an extra $100 and order the 11 3/4 caliper brackets from Dr. Diff new.

I searched for a set pf Upper control arms and spindles at darn near every yard in my area. seem like they scrapped all the older models and only had FWD card or later models and if they had them they were 120.00+ . I even went on here and looked. 150-250 USED for a setup that I'd have to add new upper ball joints new calipers and rotors hoses and brakes hoses and lines just didn't seem cost effective to me. also if I go with the later spindles it widens up my wheel track width. bout a 1/2 inch or so. I'm stuffing int he biggest tires front and rear so that limited that idea due to me knowing that I'm not going to bend in the front fender to get tires to fit. total cost would have been Wayyyyy more than the 380 or so I have in an all new from the spindles out. At least by the cost of the used parts I'd be putting on,spindles,caliper brabket and BBJ uca. just to use stock parts that are getting harder to find new or used.

yes I did replace all my bushings(offset all the way around on the UCA) and ball joints and tie rod ends but that was something I'd do any way on an older car I planned on driving the heck out of.

it all Boils down to money for me. if I can get the bolt pattern I want (5 on 4.5) and keep the front track I want. using any kind of part that is new and safe and fit correctly I'll do it. I really won't put a chevy engine/trans in a mopar , of course I'd stuff a hemi(if I had one) in anything. but as for steering components,suspension and braking components they made by "moog,TRW Monroe. ect.."(or other parts companies) and "moog" doesn't give a crap what car they go on to to make stop-turn or soften potholes they make a part that does a certain thing the ordering company wants. that's just like saying the chrome plating company put "chevy chrome on my mopar". or that holley is a "ford" holley why did you put it on your mopar? or your turn signal flasher fits a toyota too! "quick yank it out or it'll contaminate my car" or :the list goes on and on.

I'm good with you wanting to put only mopar parts on you mopar.

But in my area and on the web those parts are priced as gold.(again the money thing) but you now have options and yes one of them is a P-S-T kit or just suspensions and many others.
Another way is how I went (scarebird). it fit's and works and I only had to do 1 machining process that I was going to do anyway(5 on 4.5 bolt pattern on the hub $40.00) and it's basically about what you(or me or the other guy) wants to pay and put on their car.
 
As you state it is a personal choice and whatever makes one happy! But I will say one last thing you put your time money and love into your hot rod, Mopar, antique restoration! To have the motor run hot and go fast is one thing not so hard, but to make the old baby stop is another, on todays roads, with todays drivers, it is reality to be able to stop on a dime! If the car can go zero to sixty quick it needs to stop just as quick! So spending a little more on a good kit to make it stop right is what it takes I will do it every time! Again it is my opinion! I had my 66 cuda munched by a fool pulling out of his driveway on my way home from Great Lakes Dragway one rainy Sunday afternoon, minding my own business going slow, he creamed my baby! I will never forget it and never do anything to allow another fool to hit me again, or not spend a lttle more to make sure my end is top of the line! It is simple to be safe on todays roads, not simple to protect oneself from fools on todays roads!!!! See them everyday!!! JMO again!

65CudaLover Go Fast Stop Fast!!! Mopar or No Car!!!
 
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