Disc Brake Master Swap & P valve Question
Thanks for the post. Yes, swapping upper arms, spindles etc. Actually, just took the whole suspension off the '73, going to rebuild it and then bolt everything on to the '71. That way I know what I've got if I need parts later on.
The '73 has its proportioning valve on it so I can use that. I just wondered, as the '71 is a disc drum car already, if I needed to make the swap. It is the disc already that throws me a bit and gets me wondering. Manual master cylinder is for the existing disc drum set so wonder if it has the same proportioning valve that will work with the updated discs and drums?
Hope I'm making sense.
If I can use the existing master cylinder and valving (is something different on the '71 disc drum cars as far as system there?) then that will save me some work. If not then I'll have to get into seeing what it entails to bolt on the '73 master with booster onto the '71 with the '73's proportioning valve.
Thanks for all the help.
Cheers
Let me see if I can help clear up a couple things.
First of all any disc brake master cylinder from 1967-1978 will work.
A disc brake m/c has one big pod and one small pod.
So yes your disc master will work fine.
In 1979 a new aluminum m/c was introduced,but was mounted with two studs instead of four.Using this m/c is possible,but will require an adapter bracket from Mopar Performance.This m/c is a favorite of many,lightweight with great performance.
Avoid rebuilts! There is no single item which,when rebuilt,has such a poor reliability record as master cylinders.
On the valving:
Going from 9" brakes to 10" brakes you should not have lock up problems.If you were to go from 10" to 9",then you could.
On a side note:
If your rear brakes locked up a old trick would be to install rear wheel cylinders of a smaller diameter.Many Chrysler cars of the late 1960's and early 1970's used a 15/16" rear wheel cylinder.Using a 7/8" wheel cylinder would help balance brake proportioning.
I say run it how it is.
If you dont like the performance of the back brakes then install the 73 proportioning valve,or install a adjustable proportioning valve for the rears.You should be fine!!!!!!!
John
