| Brakes - Part 2
Brakes Part 1: click
here
Question: Is it a must to have a proportioning
valve when using a manual 84 mustang master cylinder and rear
disc brakes?
Comments:
[IL] "If you are running discs in the
rear you don't need and valve. But I recommend the Wilwood
adjustable inline valve in the rear line so you can change the brake
bias."
[DW] "I'm running 4-wheel discs with the
84 m/c. I haven't found any need for the proportioning valve. If you
have cut your pedal, you will find a little more pedal travel than
you would like to have, but other than that, no problems."
[pp] "I could really be wrong on this but
don't you need some residual pressure in the lines of like 3-4lbs on
the rear discs so they react positively like the front discs???"
[EG] "There are two lines of thought.
1994 Cobra from a 4wd system. Others seem to be having good luck
with the 84 Jeep from a 2wd system.
The jeep is cheaper at about $20.00 rebuilt vs $85 for a new bendix
94 cobra unit.
Personally I bought the cobra unit. Do not
have it installed yet. Wayne swears by it. Inman and others swear by
the jeep. They are both 15/16 bore."
[SC] "Should I not shorten my brake pedal
if I use the 84 mustang master cylinder?"
[EG] "about 90% of all I ever read on the
brake subject says to shorten your brake pedal regardless of what
other setup you have. A few folks have reported that they had good
brakes with out it. I don't actually ever remember someone saying
their brakes were too sensitive."
[AL] "I remember reading somewhere that
residual valves were only needed if your MC was below any of your
brake lines. But I could be wrong.
I have disc all around a 84 MC with a
adjustable prop valve in the rear line. In my case I found more bias
to the rears helped then without it.
I'm told if you do a lot of racing on
different tracks it helps to be able to change to the varying
conditions track to track."
[Wade] "If you run power brakes, such as
with the hydrobooster, you do not need to modify the brake
pedal."
[SC] "I just got back from the junk yard.
will a master cylinder off a 87 jeep work. I got a very clean
aluminum master cylinder for almost nothing. it looks like it will
bolt right up but will this master cylinder not have the right size
bore?"
[EG] "The 84 jeep unit we have talked of
so many times is a huge, iron, ugly thing. And, it has the
connections on the correct side. If yours is pretty and aluminum,
you do not have the one. Will yours work?? what is the bore size?
What is the stroke and are the connections on the correct side??"
[SC] "It looks just like the 84 mustang
cylinder but its aluminum and a little bigger. The connections ARE
on the right side."
[EG] "I just checked and this 87 jeep
master cylinder is 15/16" and has the brake lines on the correct
side. Its a good bit bigger than the 84 mustang master cylinder but
its made of aluminum so its about the same weight. Now I just have
to make myself remove the master cylinder that's on the car now. I
just hate getting that brake fluid ever were, and bleeding that
brakes."
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