Symptoms of a Bad or Failing Proportioning/Combination Valve

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The proportioning valve, also called the combination valve, is located in the disc braking system. It is responsible for controlling the braking pressure between the front and rear brakes. Equal brake force cannot be applied to all of the wheels on the car at the same time because the rear wheels will lock up. Vehicles with drum brakes in the rear have much lower pressure for the drum brakes than the front disc brakes. This is why the proportioning valve only lets a particular amount of pressure through to the rear brakes. If you suspect there is an issue with your proportioning valve, check for the following symptom:

Rear wheels lock up

Since the proportioning valve decreases the pressure sent to the rear brakes, the main symptom the valve is going bad is the rear wheels locking up when the brakes are applied. Furthermore, the wheels will lock up more easily on wet surfaces. The rear brakes may feel touchy when applied even gently. As soon as you notice the rear wheels locking up, contact a professional mechanic to have your proportioning/combination valve replaced.

How to check the problem

If you suspect you have a problem with the proportioning valve and want to test it on your own, there is a way to safely do this. Find an empty parking lot and have someone come with you so they can watch the back brakes. With the person safely away from the vehicle, drive the car and make a few medium to hard stops. Make sure to press the brake several times to simulate an emergency stop. If the rear wheels lock up and the front wheels turn normally, there is an issue with the proportioning valve. This test should be performed with extreme caution.

Best left to the professionals

Repairing and replacing the proportioning/conditioning valve is best left to the professionals because you are dealing with the braking system. While you can test the problem on your own, it is a good idea to have a professional mechanic fix the problem. Specialized tools are used by technicians to accurately diagnose failures that may not otherwise be noticed. The brakes are an essential part of your vehicle, and if you need to use them in an emergency, it is important they work correctly.

As soon as you notice your rear wheels are locking up, especially on wet surfaces, have your brake system checked by a qualified mechanic. The proportioning/conditioning valve is an important part of the braking system, so as soon as you see the symptom above, use caution if you have to drive the vehicle. YourMechanic makes getting repairs to your proportioning / combination valve easy by coming to your home or office to diagnose or fix issues. You can book a service online 24/7. YourMechanic’s qualified technicians are also available for any questions that may arise.


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Recent Proportioning / Combination Valve Replacement reviews

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YourMechanic Proportioning / Combination Valve Replacement Service

Average Rating

4.9/5

Number of Reviews

123,238

Rating Summary
114,935
4,663
932
641
2,067
114,935
4,663
932
641
2,067

Joel

19 years of experience
744 reviews
Joel
19 years of experience
Kia Spectra - Proportioning / Combination Valve - Jacksonville, Florida
Very positive experience. Identified the correct problem quickly. I had to make a follow up appointment because the part had to be ordered. Joel arrived promptly both appointments. Very professional. There were no hidden charges. Made an unexpected car problem less stressful.
Acura RSX - Valve Cover Gasket - Jacksonville, Florida

Jose

15 years of experience
433 reviews
Jose
15 years of experience
Honda CR-V - Power door locks are not working - Portland, Oregon
Jose was a great guy who came on time , detailed on time , fixed on time and went on time :). Outside of the fix , he also suggested and spoke about my car in detail. I'd definitely recommend him
Ford Taurus - Serpentine/Drive Belt - Portland, Oregon
Joses was punctual friendly knew his business and I would recommend him to anybody and I will be booking him in the future this is a great service.

Jose

8 years of experience
285 reviews
Jose
8 years of experience
Kia Sedona - Alternator Repair - Tampa, Florida
Great job.
Cadillac Eldorado - Pre-purchase Car Inspection - Land O' Lakes, Florida
Very knowledgeable and pleasant to work with - a real pro

Oscar

22 years of experience
72 reviews
Oscar
22 years of experience
Dodge Ram 1500 - Proportioning / Combination Valve - Columbia, Maryland
Oscar was great person and very knowledgeable mechanic..

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