Audi 90 Quattro Proportioning / Combination Valve Replacement at your home or office.

Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing.

Estimate price near me

Service Location

Customer Ratings

(2,399)

Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

Customer Ratings

(2,399)

Proportioning / Combination Valve Replacement Service

How much does a Proportioning / Combination Valve Replacement cost?

On average, the cost for a Audi 90 Quattro Proportioning / Combination Valve Replacement is $456 with $361 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
1988 Audi 90 QuattroL5-2.3LService typeProportioning / Combination Valve ReplacementEstimate$836.01Shop/Dealer Price$1033.77 - $1587.66
1993 Audi 90 QuattroV6-2.8LService typeProportioning / Combination Valve ReplacementEstimate$816.01Shop/Dealer Price$1013.80 - $1567.71
1991 Audi 90 QuattroL5-2.3LService typeProportioning / Combination Valve ReplacementEstimate$816.01Shop/Dealer Price$1013.80 - $1567.71
1990 Audi 90 QuattroL5-2.3LService typeProportioning / Combination Valve ReplacementEstimate$816.01Shop/Dealer Price$1013.76 - $1567.64
1992 Audi 90 QuattroL5-2.3LService typeProportioning / Combination Valve ReplacementEstimate$816.01Shop/Dealer Price$1013.82 - $1567.76
1994 Audi 90 QuattroV6-2.8LService typeProportioning / Combination Valve ReplacementEstimate$816.01Shop/Dealer Price$1013.80 - $1567.71
1989 Audi 90 QuattroL5-2.3LService typeProportioning / Combination Valve ReplacementEstimate$821.01Shop/Dealer Price$1018.56 - $1572.29
1995 Audi 90 QuattroV6-2.8LService typeProportioning / Combination Valve ReplacementEstimate$821.01Shop/Dealer Price$1019.21 - $1573.43
Show example Audi 90 Quattro Proportioning / Combination Valve Replacement prices

What is the Proportioning / Combination Valve all about?

Your braking system relies on hydraulic pressure to operate. When you depress the brake pedal, brake fluid is pushed through the system to the wheels. Fluid pressure is responsible for actuating both disc brake calipers, as well as drum brakes. However, there are numerous components in line between the brake pedal and the brakes themselves, including the combination valve.

The combination valve is responsible for metering fluid to disc brakes, as well as fulfilling tasks done by both the pressure differential switch and proportioning valve (which is responsible for reducing the fluid pressure in the lines leading to the rear drum brakes). This is necessary because of how brakes work in terms of lockup – the more weight there is on a wheel, the more force can be applied without locking up the brakes. In rear drum brakes, the weight on the wheel is comparatively small (the weight of the engine on the front wheels is considerable).

Keep in mind:

  • In modern cars that employ combination valves, replacing the entire valve body is necessary if the proportioning valve fails.
  • There is no way to check operation on this type of valve unless it has failed completely.
  • The valve may have failed due to many reasons, including debris in the brake fluid.

How it's done:

  • The defective proportioning combination valve brake lines are disconnected
  • The defective proportioning combination valve is removed from the vehicle
  • The new proportioning combination valve is installed and the brake lines are connected to valve
  • The brake system is bled and purged of air in the system and the brake fluid is refilled
  • The vehicle is road tested for proper brake operation

Our recommendation:

Follow your automaker’s recommendations on brake system service to ensure that the fluid remains in good condition and free of debris. Have your braking system maintained by our expert mechanics to ensure that any potential problems are caught as soon as possible. Driving with a failing proportioning valve puts you at increased risk.

What common symptoms indicate you may need to replace the Proportioning / Combination Valve?

  • Rear brakes lock up easily, particularly on wet pavement

How important is this service?

While it is still possible to drive with a failed or failing proportioning valve, it’s not recommended because it decreases your safety while increasing the risk of being involved in an accident because your rear brakes lock up under even light loads. Have the entire combination valve assembly replaced immediately.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee


Meet some of our expert Audi mechanics

Real customer reviews from Audi owners like you.

Excellent Rating

(2,399)

Rating Summary
2,226
85
19
12
57
2,226
85
19
12
57

Matthew

12 years of experience
183 reviews
Matthew
12 years of experience
Audi S5 V6-3.0L Turbo - Pre-purchase Car Inspection - Indianapolis, Indiana
Matthew gave me a call as soon as he completed the inspection to verbally let me know about the condition of the car I intended on purchasing, and took the time to answer any questions I had. He promptly responded to a few follow-up questions that I had after I reviewed the report (which was incredibly thorough and helpful). His detailed comments gave me the confidence to move forward with the purchase. Thanks, Matthew!

Andrew

11 years of experience
849 reviews
Andrew
11 years of experience
Audi A5 Quattro L4-2.0L Turbo - Brake Pads Replacement (Front) - Kansas City, Kansas
Showed up on time and got the job done quickly.

Edmar

22 years of experience
246 reviews
Edmar
22 years of experience
Audi A6 Quattro V6-3.2L - Check Engine Light is on - Lewisville, Texas
Great

Chris

22 years of experience
2235 reviews
Chris
22 years of experience
Audi Q5 L4-2.0L Turbo - Brake Pads Replacement (Front, Rear) - Trabuco Canyon, California
Chris was great about getting the right parts & getting the job done.

Excellent Rating

(2,399)

Rating Summary
2,226
85
19
12
57
2,226
85
19
12
57
Number of Audi services completed
26389+
services done by our mechanics
TOTAL NUMBER OF EXPERT Audi MECHANICS
700+
experts on our platform

Recent articles & questions

Symptoms of a Bad or Failing Carburetor
Common signs include reduced engine performance, black smoke coming from the exhaust, backfiring, overheating, or hard starting.
P2240 OBD-II Trouble Code: O2 Sensor Positive Current Control Circuit/Open Bank 2 Sensor 1
P2240 P2240 trouble code definition O2 Sensor Positive Current Control Circuit/Open Bank 2 Sensor 1 What the P2240 code means P2240 is an OBD-II generic code for the engine control module (ECM) detecting the air-fuel (A/F) ratio sensor signal is...
P0607 OBD-II Trouble Code: Control Module Performance
P0607 P0607 code definition The P0607 trouble code marks a performance problem with the control module. This code is often related to the P0602, P0603, P0604, P0605 (https://www.yourmechanic.com/article/p0605-obd-ii-trouble-code-p0605-internal-control-module-rom-error-module-identification-defined-by-sae-j1979-by-blake), and P0606 (https://www.yourmechanic.com/article/p0606-obd-ii-trouble-code-pcm-processor-fault-by-jamahl-walker) trouble codes. What the P0607 code means P0607 is...

How do I navigate through the Uplevel Message Center?

Your truck has a helpful tool called the Uplevel Message Center. This message center logs many of your vehicle's functions and displays them for you to use. There are many features to see in the Uplevel Message Center. To navigate...

I might be having transmission issues but then i think it could be a engine problem.

Hello, From what you describe it appears that whatever problem your vehicle may be experiencing has caused it to go into limp mode. Limp mode is a precautionary mode where the power and speed of the vehicle are severely limited....

Performance Restricted Warning and Check Engine Light - 2004 Jaguar XK8

Hello. The engine knock sensor is retarding the ignition timing to match what the lower octane fuel can support in terms of “timing advance.” There is nothing to worry about. The engine computer is just operating the engine so as...

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 (855) 347-2779 · hi@yourmechanic.com