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Brake Proportioning Valve

A bad brake proportioning valve may cause your vehicle to skid and make you lose control of your vehicle during hard braking. Don’t worry, CarParts.com can help you replace your damaged proportioning valve. We have a wide selection of high-quality brake proportioning valves built for different makes and models. Available in brass, aluminum, and aluminum and steel, our durable valves are made by the best manufacturers. Don’t wait until your brakes lock up. Maintain your vehicle’s safety and check out our products today.

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21998450 Brake Proportioning Valve - Direct Fit, Sold individually
Part Number: AC21998450
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$101.99
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Warranty : 24-months or unlimited mile AC Delco limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
15166885 Brake Proportioning Valve - Direct Fit, Sold individually
Part Number: AC15166885
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$92.99
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Warranty : 24-months or unlimited mile AC Delco limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
15835212 Brake Proportioning Valve - Direct Fit, Sold individually
Part Number: AC15835212
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$71.49
Product Details
Warranty : 24-months or unlimited mile AC Delco limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
19244448 Brake Proportioning Valve - Direct Fit, Sold individually
Part Number: AC19244448
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$46.49
Product Details
Warranty : 24-months or unlimited mile AC Delco limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
21998447 Brake Proportioning Valve - Direct Fit, Sold individually
Part Number: AC21998447
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$119.99
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Warranty : 24-months or unlimited mile AC Delco limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
21998448 Brake Proportioning Valve - Direct Fit, Sold individually
Part Number: AC21998448
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$121.99
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Warranty : 24-months or unlimited mile AC Delco limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
10-V18006 Brake Proportioning Valve - Natural, Aluminum, Direct Fit, Sold individually
Part Number: A110V18006
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$45.99
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Notes : RemanufacturedWarranty : 3-year or 36,000-mile A1 Cardone limited warrantyAnticipated Ship Out Time : 1-2 Business DaysQuantity Sold : Sold individually
13-PV001 Brake Proportioning Valve - Bronze, Brass, Direct Fit, Sold individually
Part Number: A113PV001
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$49.99
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Warranty : Lifetime A1 Cardone limited warrantyAnticipated Ship Out Time : 1-2 Business DaysQuantity Sold : Sold individually
905-906 Brake Proportioning Valve - Gray and silver/zinc-plated, Aluminum, Direct Fit, Sold individually
Part Number: RB905906
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$50.99
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Notes : Does not include switchWarranty : Lifetime Dorman limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
905-907 Brake Proportioning Valve - Gray and silver/zinc-plated, Aluminum and Steel, Direct Fit, Sold individually
Part Number: RB905907
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$49.99
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Notes : Does not include switchWarranty : Lifetime Dorman limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individuallyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Chromium, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

905-930 Brake Proportioning Valve - Direct Fit, Sold individually
Part Number: RB905930
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$35.49
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Warranty : Lifetime Dorman limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
905-952 Brake Proportioning Valve - Direct Fit, Sold individually
Part Number: RB905952
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$19.49
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Warranty : Lifetime Dorman limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
905-953 Brake Proportioning Valve - Direct Fit, Sold individually
Part Number: RB905953
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$30.99
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Warranty : Lifetime Dorman limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
905-955 Brake Proportioning Valve - Aluminum, Direct Fit, Sold individually
Part Number: RB905955
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$29.49
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Warranty : Lifetime Dorman limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
905-962 Brake Proportioning Valve - Direct Fit, Sold individually
Part Number: RB905962
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$47.49
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Warranty : Lifetime Dorman limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
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Brake Proportioning Valve Guides

Brake Proportioning Valve Buyer's Guide

Summary:

  • The brake proportioning valve is a part of the anti-lock braking system (ABS) that prevents the rear wheels from locking up during harsh braking conditions.

  • It is typically mounted to the vehicle’s master cylinder. In some cases, it can be found in the combination valve.

  • The brake proportioning valve limits the fluid pressure from a vehicle’s rear brake circuit and sends more braking pressure to its front brakes during a panic stop.

  • The valve only works during panic braking situations. When this happens, the build-up of fluid pressure from the master cylinder compresses the valve’s spring and moves a piston that closes the valve.

  • An aftermarket brake proportioning valve can cost you anywhere between $30 and $299, depending on your vehicle’s year, make, and model. It is usually sold individually.

How a brake works seems like a simple process. You might think that stepping on the brake pedal is all there is to it, however, there are various parts that work together to safely bring your vehicle to a complete stop. 

An important part of your vehicle’s braking system is the brake proportioning valve. It is a safety component that plays an integral role in preventing rear wheel lock-up and providing stability during panic braking situations. 

If this part is damaged, accidents may occur due to loss of vehicle control and may result in costly repairs. Here’s a guide to know more about the brake proportioning valve and when to replace it. 

What Is a Brake Proportioning Valve?

The brake proportioning valve is a part of the anti-lock braking system (ABS) that prevents the rear wheels from locking up during harsh braking conditions. It is commonly found in vehicles equipped with front disc and rear drum brakes. 

Where Is the Brake Proportioning Valve Located?

The brake proportioning valve is typically mounted on the vehicle’s master cylinder. In some cases, it can be found on the combination valve.

What Does a Brake Proportioning Valve Do?

The brake proportioning valve limits the fluid pressure from a vehicle’s rear brake circuit and sends more braking pressure to its front brakes during a panic stop. This is because the front brakes receive greater weight transfer than rear brakes, thus requiring more braking effort. The valve balances the vehicle’s brake pressure and prevents its rear wheels from locking up. 

Brake Proportioning Valve: How Does It Work?

To fully understand how a brake proportioning valve works, it is important to know how your vehicle’s braking system functions.

Brakes convert a vehicle’s kinetic energy to heat, creating friction between the wheel and the disc or drum brake to reduce the car’s speed and eventually stop it from moving. This is made possible as you step on the brake pedal, which triggers a mechanism that releases hydraulic fluid into each wheel cylinder. 

A brake proportioning valve only works during panic braking situations. When this happens, the build-up of fluid pressure from the master cylinder compresses the valve’s spring and moves a piston that closes the valve. Once the valve is closed, fluid will no longer flow to the rear brakes.

Types of Braking Systems 

There are four types of braking systems: hydraulic, mechanical, electromagnetic, and servo.

Hydraulic 

A hydraulic braking system uses brake fluid, cylinders, and friction to activate a vehicle’s brake pads. This type generates a greater braking force than the mechanical braking system.

Mechanical 

This type of braking system is typically found in early-model vehicles. It uses mechanical components, such as cylindrical rods, fulcrums, and springs, to apply brake force to the vehicle’s brake drum or disc rotor. 

Electromagnetic

This braking system features a frictionless braking mechanism by relying on a magnetic flux to create an opposing force against wheel rotation. 

Servo

The servo braking system, also known as vacuum-assisted braking, uses a vacuum produced by a vehicle’s inlet manifold to apply brake force. 

Do I Need a Brake Proportioning Valve?

Aside from preventing rear wheel lock-ups, installing a brake proportioning valve helps you control brake balance and provides stability during heavy braking. 

If your vehicle has front wheel disc brakes and rear wheel drum brakes, a brake proportioning valve is needed for your braking system to operate properly.

What Happens During a Lock-Up? 

If your vehicle’s brakes lock up, the tires will lose traction and no longer spin, causing the vehicle to skid. This is due to the brakes’ internal friction being greater than the friction between the tires and the road.

Types of Brake Proportioning Valves

There are three types of brake proportioning valves: fixed, adjustable, and lever-type.

Fixed Proportioning Valve

This is a non-adjustable valve that is typically used in stock applications and slightly modified vehicles. 

Adjustable Proportioning Valve

This type of valve uses a knob in adjusting brakes. It is commonly used in performance vehicles or those equipped with an aftermarket braking system to adjust brake pressure. 

Lever Proportioning Valve

This type allows you to adjust a specific wheel’s brake line pressure using a lever instead of a knob.

What Causes a Brake Proportioning Valve to Fail?

A brake proportioning valve may fail due to a corroded cap screw. This may prevent the piston from moving during a panic braking situation due to water and contaminants blocking the valve.

How Much Will a Replacement Brake Proportioning Valve Cost?

An aftermarket brake proportioning valve can cost you anywhere between $30 and $299, depending on your vehicle’s year, make, and model. It is usually sold individually. 

Finding the Right Fit 

Finding the right brake proportioning valve for your ride is easier with CarParts.com. Simply enter your vehicle’s year, make, and model in our website’s vehicle selector to narrow down the results to compatible brake valves guaranteed to fit your car.

Helpful Automotive Resources

Brake Proportioning Valve Problems
Brake Proportioning Valve ProblemsIn this article, we’ll talk about a critical part of many braking systems⁠—the proportioning valve. Read on to find out what it is and what problems your vehicle may experience if it fails. The brake proportioning valve is a spring-loaded device that improves brake balance by reducing rear brake pressure during
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