Symptoms of a Bad or Failing Proportioning/Combination Valve

Our certified mechanics come to you · Backed by our 12-month, 12,000-mile warranty · Get a fair and transparent estimate upfront

GET A QUOTE Backed by 12-month, 12,000-mile guarantee
Red-stars EXCELLENT RATING ON

Cost of Replacing a Bad or Failing Proportioning/Combination Valve

If your rear brakes are locking up, especially on wet surfaces, you should have a mechanic inspect the proportioning/combination valve. Our certified technicians can come to you and diagnose the problem. You will receive a $30 credit towards any follow-up repairs that result from the diagnostic. Following are example prices for Proportioning / Combination Valve Replacement. Click on the button below to get an upfront quote for your car.

Cars Estimate Parts Cost Labor Cost Savings Average Dealer Price
2013 Toyota Prius $464 $372.95 $91.00 9% $512.70
2003 Dodge Ram 1500 $615 $524.12 $91.00 7% $663.87
2003 Nissan Altima $502 $411.37 $91.00 8% $551.12
2014 BMW 740Li xDrive $413 $307.67 $105.00 11% $468.92
2007 Lexus SC430 $438 $325.81 $112.00 12% $497.81
2006 Porsche Boxster $453 $354.54 $98.00 10% $505.04
GET A QUOTE FOR YOUR CAR

How to Diagnose a Bad or Failing Proportioning/Combination Valve?

proportioning combination valve

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.

Locks
valves
brake system

Fast and easy Proportioning / Combination Valve Replacement service at your home or office.

GET A QUOTE FOR YOUR CAR
Backed by 12-month, 12,000-mile guarantee

More related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP)...

Related questions

Q: Power locking,and unlocking with remote does not work

Hello there, you have several different issues going on with your 2006 Acura MDX. When the window regulator is replaced there is a window reset procedure that must be done, this tells the regulator when the window is fully closed,...

Q: Car leaking oil, oil blows out of dip stick tube

If you had excessive blowby from worn rings and all, then you would have excessive smoking and oil consumption through the engine. It almost sounds like your PCV (positive crankcase ventilation) system is not feeding blowby gasses back to the...

Q: Burning Smell and Squeaking Wheel 2007 Honda Civic

Hello - the smell and "hot" symptoms you describe suggest your rear brake is dragging on that rear wheel. This could be an emergency brake cable which is not releasing, or a frozen brake cylinder or caliper. I recommend a...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com