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Old 10-08-2006, 09:19 AM
 
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brake proportion valves

my 73 nova proportion valve locked up my front wheels, looked for a replacement valve could not find any, could i use a adjustable valve like a tilton in place of my stock valve. Wormy.

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Old 10-08-2006, 09:35 AM
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IF your front and rear brakes are working, AND are sized correctly for your cars braking requirements,and you are having front wheel lockup then there is an issue with your combination valve.

If that 73 nova "proportioning valve" was intended for drum brakes then there is no metering valve and probably no rear proportioning valve and your fronts will lock up at low speeds.

If you have a disc front and a drum rear system then a proportioning valve for the rear will help, but you should get metering valve for the front also. ECI sells them.

Did you try classic industries?
Right here is a stock type proportioning valve for disc/drum.

What is your cars setup?

later, mikey
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Old 10-08-2006, 09:44 AM
 
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4 wheel drum brakes, brake booster, mastercylinder and the valve, valve has about 4 lines coming out of it, i had to remove the front line on the mastercylinder to get the car home, could it be my master cylinder, i have never had a proportion valve go bad just looking to upgrade if i cannot find a replacment Wormy.
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Old 10-08-2006, 09:55 AM
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Do the rears work at all? Was this a gradually worsening problem or did it just come on?
Did the feel of the pedal change when his problem came on?
Is there a broken return spring or something else mechanical going on in the fronts?

Did the differential pressure valve set to the front, and eliminate pressure to the rears?
Is your brake system light on? Does the brake system light still work?

When you bleed the system (with the front line on the master), do you get fluid at all bleeders?

Questions.
Mikey
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Old 10-08-2006, 10:11 AM
 
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happend all at once, still have rear brakes, pedal felt hard before i removed the front line on the master cylinder, when i removed the front line only a little fluid came out but. when front line is hooked up its like the front wheels are holding, car will barely push the front wheeles, like a line lock, all brake parts are new except valve and master, one of those things i have never had happen, a week or so before i did a little powerbraking dont think that would have hurt, car had great brakes before. Wormy.
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Old 10-08-2006, 10:38 AM
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It sounds like a combination of problems.
So then do the fronts lock up at all speeds, with normal effort at the pedal? And when you let off the pedal will the brakes retract, or does it stay locked?
Sometimes if a master cyl is not returning all the way the brakes will stay applied even when the pedal is let up.

If you have rear brakes with the line off then the differential pressure valve is ok or maybe has reset itself to the other side. Does the brake system light function? If it is on then you may have a non centered valve.

Did you disconnect the vacuum to the booster and see if it acts the same?

If you check the booster and valve out I would put a master in it just to rule it out as a potential problem, and I would check the pushrod depth before I installed the new one.

Bleed all the air out then see what you have.
Check your adjustment and shoes at the rears especially.

later, mikey
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Old 10-08-2006, 10:47 AM
 
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with line hooked up pedal is hard and front wheels are locked ,will change master cheap way to start i guess thanks Wormy.
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