73 ford bronco brakes/proportioning valves

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pachita - 11 Jul 2005 01:09 GMT

I put front disc brakes on and left the drums on back, replaced master
cyclinder and bled system and the brake pedal still goes to the floor!
Need help,, don't understand how to use the proportioning valve that we
got with the brakes....the directions says can't put between the master
cylinder and block with switch....help me!!

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Michael - 11 Jul 2005 22:47 GMT

>I put front disc brakes on and left the drums on back, replaced master
> cyclinder and bled system and the brake pedal still goes to the floor!
> Need help,, don't understand how to use the proportioning valve that we
> got with the brakes....the directions says can't put between the master
> cylinder and block with switch....help me!!

The new master cylinder should have come with a couple of plastic threaded
fittings and short pieces of rubber hose to bench bleed the master cylinder
before connecting it to the system. If you didn't do this, try it and then
bleed the whole system again, beginning with the wheel farthest from the
master cylinder. The proportioning valve controls the line pressure
distribution front to rear. The vehicle most likely had one originally, but
with front discs, you will need to replace it with the one from the kit. The
two should look very similar, unless the new one is adjustable. In that case
it will have a knob.

mike

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pachita - 13 Jul 2005 18:54 GMT

i have recently read about a "combination valve" that is supposed to be
used with a residual valve. I don t think those are going to be
adjustable...but we will re bench bleed the system and then bleed the
system..

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Rob - 14 Jul 2005 06:21 GMT

> I put front disc brakes on and left the drums on back, replaced master
> cyclinder and bled system and the brake pedal still goes to the floor!
> Need help,, don't understand how to use the proportioning valve that we
> got with the brakes....the directions says can't put between the master
> cylinder and block with switch....help me!!

why not save youself the trouble and go to the wreckers and get yourself
the brake system from a 1974-1979 f 150 ? even newer ones before the
advent of antilock brakes ... take notes on how it was installed and put
it in the same way. ps dont take the brake lines.... buy new ones they
are cheap

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