Quick brake question

[DBasher]

I picked up a m/c and booster set up from CPP, it's set up for disc/drum. I'm now looking at putting an Explorer rear end in that has disc brakes, is this an issue?
The CPP kit has a proportioning valve so I'm ASSuming it will work....don't want to assume with the brakes though.


Dan

[Apogee]

Originally Posted by DBasher

I picked up a m/c and booster set up from CPP, it's set up for disc/drum. I'm now looking at putting an Explorer rear end in that has disc brakes, is this an issue?
The CPP kit has a proportioning valve so I'm ASSuming it will work....don't want to assume with the brakes though.


Dan

Part number? If you have the disc/drum combination valve with the fixed proportioning valve, then you'll want to swap that out for a disc/disc unit, otherwise your rear brakes will be greatly underutilized. Disc brakes require more pressure than drums, so while the disc/drum combination valves will work in a disc/disc application, it just means that you won't achieve adequate pressure to the rear calipers to make them function like they should, making your front brakes do almost all of the work.

Tobin
KORE3

[Ron Sutton]

Tobin,

Does that mean the CPP proportioning valve for a disc/drum set-up reduces the brake line pressure significantly to the rear brakes?

Do the factory proportioning valves for disc/drum set-ups do the same ?

[DBasher]

Thanks Tobin,
I have P# 5760BB2-9 which is the disc/drum set up. It has a fixed proportioning valve on it, pull it off and install an adjustable and I'm good to go?


Dan

[DBasher]

So I just found the info I needed. Looks like all I need to do is pull a lil plug out of the valve at the rear brake line and I'm hot to trot!

Woot woot!
Thanks again Tobin

Dan

[Apogee]

Originally Posted by Ron Sutton

Tobin,

Does that mean the CPP proportioning valve for a disc/drum set-up reduces the brake line pressure significantly to the rear brakes?

Do the factory proportioning valves for disc/drum set-ups do the same ?

The CPP #5760BB2-9 appears to be a reproduction of the 1971-1977 GM disc/drum combination valve, so the functionality should be comparable to the OE GM units they're designed to mimic. Due to the mechanical servo action of drums, they require proportionally less pressure to produce progressively higher brake torques, so the slope of the pressure rise after the knee point is shallower as determined by the shape of the armature inside the prop valve versus a disc/disc unit.

Tobin
KORE3

[Ron Sutton]

Thanks Tobin !