Rear disc on A-body

[famous bob]

Here is why I run rear discs. Because I have only owned 67-69 darts.

So right off the bat you need to swap to the big bolt pattern.

Now you need brakes with the BBP. So at that point if you need new brake why not go with discs?

Better look, better function, simpler, modern, etc, etc

View attachment 1714945746

Won`t turn sideways on u when the guy in front of u stops in the middle of the road watching a very attractive girl in a mini dress, with her cheeks hanging out. I saw her and was looking also, then noticed he was stopped in front of me, Panic stop, JUST CLEARED HIM ABOUT AN 1". I have them all around on this fish. Do it if u can, won`t be sorry. The barracuda I was driving at the time was brand new, 1968-tinker air force base, and the back end did come around sideways w/ drum brakes.

 

[72Duster440]

New cars come with rear discs for a reason and it isn't bling.

Now spending the extra on cross drilled and slotted rotors..yeah, perhaps bling!

Most likely due to government mandates of having ABS. Sure is a lot easier to control with a caliper than a drum.

 

[roccodart440]

Most likely due to government mandates of having ABS. Sure is a lot easier to control with a caliper than a drum.

That makes a lot of sense. plus safer, no brake fade, consistent braking , less parts, simpler maintenance and repair etc.

 

[72Duster440]

I swapped them into mine, I like how they work, but I just picked up a smaller bore master, the one that came with my front SSBC kit is over 1"

 

[roccodart440]

I swapped them into mine, I like how they work, but I just picked up a smaller bore master, the one that came with my front SSBC kit is over 1"

I went 7/8"

"poor man's power brakes"

 

[72Duster440]

I got the aluminum one from Doctor diff, I think it's 15/16"

 

[Ottmundr]

New cars come with rear discs for a reason and it isn't bling.

Now spending the extra on cross drilled and slotted rotors..yeah, perhaps bling!

I don't know about the cross drilling because it reduces surface area for braking. I don't know the average percentage of square inches lost under the pad vs the surface area gained for cooling.

Regarding slotting the disks, I would not do it. You create stress risers. Bad idea on a street driven car because the braking components are not checked often.

 

[roccodart440]

I don't know about the cross drilling because it reduces surface area for braking. I don't know the average percentage of square inches lost under the pad vs the surface area gained for cooling.

Regarding slotting the disks, I would not do it. You create stress risers. Bad idea on a street driven car because the braking components are not checked often.

Mine are slotted and cross drilled. We'll see. Bill Reilly seems to think they are ok. Crossdrilling can't be an issue as they use them on HP racing applications.

 

[Ottmundr]

Mine are slotted and cross drilled. We'll see. Bill Reilly seems to think they are ok. Crossdrilling can't be an issue as they use them on HP racing applications.

I suspect that cross drilling rotors is more beneficial than harmful for racing applications, especially on road race applications where one would be on them for shorter periods but more frequently. They would probably provide better cooling by increasing surface area for
convective cooling.

I bet if you graph the Temps on the brakes on a race car vs a street car, the curves would be significantly different.