Question about 1991 Buick Century

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Proportional valve for the brakes is defective. Where can I find one? No one locally has the part. Hershey, Pa 17033

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You may find one in the junk yard or the GM dealer can order one for you.you will need the vin# of the car to get the right one.

Posted on Oct 03, 2009

Testimonial: "Junkyards must of had a run on them, Dealer said they don't make them anymore."

  • joseph Oct 07, 2009

    maybe jegs.com can help.also check a diffrent dealer, sometimes the parts dept. is lazy or just don't know how to look it up, i just ordered a new one for my 1984 dodge allthough you need GM they are still around, another junk yard you can try is harrys u pull it,they are in west hazelton,pa.ph.#(570)459-9901 they are the largest junk yard on the east coast,hope this helps.joe.

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1 Answer

How do I check and/or find a brake proportional valve oem replacement part for a 1999 Lincoln Continental


proportional valves are designed to give the right amount of hydraulic pressure to the back brake to prevent them locking up with a resultant loss of control of the vehicle
replacement of calipers would only be need once to fix jammed or leaking pistons but the pads may have to be replaced more often.
if it only the front brakes that is the problem ,I suspect that the fault will be in the compensating ports of the master cylinder that is not releasing the fluid back into the reservoir and the resultant heat build up from the pads still in contact with the discs is building up brake pressure and so keeping the pads on the discs to the point where lock up is evident
failed proportioning valves will result in no brake action to the rear wheels or rear wheel lock up
If parts are not available from the manufacturer spares department, they should be still be available from reputable brake shops as car manufacturers do not make brake parts as such but rely on brake manufacturers to supply items to specifications
the unit will be repairable by an accredited shop and failing that would be available from the wreckers.

Aug 07, 2015 | 1999 Lincoln Continental

1 Answer

1991 PATHFINDER Does this car have a proportional valve and would this cause front calipers to lock up?


Need year make and model. In most newer vehicles the valve is located in the master cylinder. It will not normally lock up the front wheels. It usually controls one front and one rear wheel at a time in the event of a brake fluid loss. If front calipers are locking up you could have seized caliper pistons/slide assemblies. The flex hoses may be deterioated internally due to contaminated brake fluid or the master cylinder may be defective

Jul 09, 2015 | Cars & Trucks

1 Answer

Need to locate 1983 delta 88 proportioning valve


proportional valve located in the mastercylinder

Aug 30, 2012 | Cars & Trucks

1 Answer

1975 gm pick-up need to bleed the proportional valve


All bleeding is done at each caliper and wheel cylinder. The proportioning valve has no bleeder. The proportioning valve makes the front brakes engage before the rears do to prevent the rear brakes from causing a sideways skid.

Jul 21, 2011 | Chevrolet G10 Cars & Trucks

3 Answers

Have a 1993 dodge Caravan SE. Purchased it from a man which converted it from ABS to hydraulics. I didn't know it had brake problems till i got it running. He put on a 3 outlet 2 inlet proportional...


if something goes wrong with abs the brake system it reverts back to standard system!! If you can pump brake pedal up and hold it and start engine and it drops thats normal.You say low pedal if you go 15mph on road and check where pedal is when brakes apply.Power brakes will push aLMost to floor while stopped but while moveing you`ll almost go to slide or will go into slide if pedal is pushed to floor.Get on some gravel at 10 mph and hit brakes to a complete stop get out and check to see if all 4 tires slid or 2 front or only 2 rear. this will get you closer to problem good luck.

Jul 12, 2011 | 1993 Dodge Caravan

1 Answer

My brakes r leaking inbetween the two rear tires n its doesnt look like any proportional valve i ever seen


Grand Ams don't use a proportioning valve. The rear brake lines should split above the rear trailing axle and go to each wheel. They have rubber flex lines that attach to the metal brake lines, but I'm not sure what valve you are talking about, or exactly where.

Apr 11, 2011 | 2001 Pontiac Grand Am SE

1 Answer

Brakes look up occasionally. Changed the callipers. Changed the proportional valve assembly. Changed the rotars.


One possible cause. Make sure you have only used DOT3 Brake fkuid. DOT4 has a swelling agent that will cause serious troubles if used in a Toyota.

Sep 25, 2010 | 1999 Toyota Camry

1 Answer

Reason for rear brake lock up. Installed on new brake pads master cyliner & fluid


CHECK PROPORTIONAL VALVE NEXT TO MASTER CYLINDER,I HAVE SEEN THEM BLOCK FLUID GOING TO REAR BRAKES.

May 10, 2009 | Chevrolet C1500 Cars & Trucks

1 Answer

NO REAR BRAKES


I would check the proportional valve.

Jan 19, 2009 | 2002 Chevrolet Express

1 Answer

1998 bravada brake problem


If you have not replaced any brake lines or brake calipers, then It sounds like that the brake proportioning valve or the brake master cylinder if defective. If the the brake pedal goes to the floor, the master cylinder is at fault. If not, the proportion valve, which is part of the ABS valve body is defective. Have your local garage check these two components for possible problems.

Jan 11, 2009 | 1998 Oldsmobile Bravada

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