Brake Proportioning Valves

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A P Racing Lever Type Proportioning Valve

A P Racing Lever Type Proportioning Valve

AP Racing brake proportioning valves are designed for use in competition vehicles where it is desired to reduce the brake line pressure to compensate for varying road / track conditions.Fitted inline this lever type valve gives the driver 7 adjustment positions which are indicated by a positive location of the lever, meaning that adjustments can be made quickly and easily even while driving.The lightweight and compact body includes 2 holes for mounting to a panel or bulkhead and features inlet and outlet ports with an M10 x 1 female thread.View more

$260.10

1 retailer

A P Racing Screw Type Proportioning Valve

A P Racing Screw Type Proportioning Valve

AP Racing brake proportioning valves are designed for use in competition vehicles where it is desired to reduce the brake line pressure to compensate for varying road / track conditions.Fitting in line the valve offers no restriction when screwed in fully, but reduces pressure by approximately 33 percent when fully opened. The screw operation of the valve allows for precise adjustment of the pressure anywhere between fully closed and open to give the best possible braking balance.The lightweight and compact body includes 2 holes for mounting to a panel or bulkhead and features inlet and outlet ports with an M10 x 1 female thread.View more

$229.07

1 retailer

A P Racing Twin Bore Lever Type Proportioning Valve

A P Racing Twin Bore Lever Type Proportioning Valve

AP Racing brake proportioning valves are designed for use in competition vehicles where it is desired to reduce the brake line pressure to compensate for varying road / track conditions.This twin bore valve has 2 inlet and 2 outlet ports which make it ideal for vehicles using the original master cylinder and twin brake lines, such as Group N. The valve offers 7 different pressure settings which are distinguished by a positive location of the lever, this means that quick adjustments can be made even while driving.The lightweight and compact body includes 2 holes for mounting to a panel or bulkhead and features inlet and outlet ports with an M10 x 1 female thread.View more

$448.23

1 retailer

Allstar Performance Screw Type Brake Bias Valve

Allstar Performance Screw Type Brake Bias Valve

This adjustable valve is designed to fit in the brake line and allows a reduction in brake pressure of up to 57% with a simple twist of a knob. It is perfect for altering the bias between the front and rear brakes meaning you can tailor the rear brake effort to suit differing road or track conditions.The inlet / outlet ports are 1/8 NPT. Adaptors are supplied to enable 3/16 copper brake pipe with a 3/8 UNF male fitting to be used.View more

$61.34

1 retailer

Longacre Brake Balance Gauges

Longacre Brake Balance Gauges

Longacre's brake balance gauges are ideal for cars fitted with a brake bias system. Instead of trying to find your optimum brake balance by endless laps around the track, you can now see and adjust them easily and quickly with no more guesswork! The lightweight aluminium panel has 2 pre wired 52mm liquid filled pressure gauges to show immediate reference of pressure bias. The pressure gauges read up to 1500 psi and are back lit. The kit includes all necessary fittings and bleeders.Dimensions7" x 3 5/8" (178 x 92mm)Gauge Diameter – 2 1/2" View more

$101.41

1 retailer

OBP Brake Bias Valve – Screw Adjustment

OBP Brake Bias Valve – Screw Adjustment

This bias valve is designed to fit in the rear brake line and enables pressure adjustment to alter the balance between front and rear brake effort with the twist of a knob. This is beneficial for changes in road / track surfaces and conditions. Inlet / outlet ports: 3/8" UNFView more

$67.05

1 retailer

Tilton Lever Type Proportioning Valve – -3 AN Ports

Tilton Lever Type Proportioning Valve – -3 AN Ports

Brake proportioning valves enable the driver to adjust the line pressure to the front or rear wheels. This allows the braking force to be tailored to the style of driving or track /road surface conditions.This lever type valve from Tilton fits in the brake line and allows for 7 different adjustments. Each adjustment is indicated with a positive location on the lever to allow precise adjustments, even while driving.The lightweight and compact body has 2 through holes to allow mounting onto a panel and has an option of either -3 AN (3/8 UNF) or M10 x 1 inlet and outlet ports. The -3 AN version is supplied with adaptors to accept 3/16 inverted flare copper brake pipe.View more

$139.48

1 retailer

Tilton Lever Type Proportioning Valve – M10 x 1 Ports

Tilton Lever Type Proportioning Valve – M10 x 1 Ports

Brake proportioning valves enable the driver to adjust the line pressure to the front or rear wheels. This allows the braking force to be tailored to the style of driving or track /road surface conditions.This lever type valve from Tilton fits in the brake line and allows for 7 different adjustments. Each adjustment is indicated with a positive location on the lever to allow precise adjustments, even while driving.The lightweight and compact body has 2 through holes to allow mounting onto a panel and has an option of either -3 AN (3/8 UNF) or M10 x 1 inlet and outlet ports. The -3 AN version is supplied with adaptors to accept 3/16 inverted flare copper brake pipe.View more

$139.48

1 retailer

Tilton Proportioning Valve Repair Kit

Tilton Proportioning Valve Repair Kit

This repair kit includes all seals required to recondition a Tilton brake proportioning valve (bias valve). It is suitable for both the screw type and the lever type valves.View more

$25.60

1 retailer

Understanding Brake Proportioning Valves

Your car’s braking system is extremely complex and intricate. There is more to automobile braking systems than rotors and callipers. The proportioning valve is one of the most important aspects of a vehicle’s braking system. Understanding how the proportioning valve works is vital to finding out when to have it checked by a technician.

How a Proportioning Valve Works

The proportioning valve connects your master cylinder to the entire braking system. This valve helps to optimise the brake balance, also known as the front-to-rear bias. The valve is a spring-loaded element that responds by building up the pressure when the driver steps on the brake pedal. This valve has a plunger that releases the brake fluid to the calibrated range. In retrospect, the spring is compressed, prompting the plunger to block the brake fluid from passing through. By controlling the release of the brake fluid, the valves ensure the even distribution of pressure in the front and rear of the car. As such, the valve is quite reliable when it comes to ensuring optimum braking performance.

Preventing Brake Lock-up

The valve helps to control the brake balance. Since the rear brakes usually receive too much load during rapid deceleration, controlling the pressure is vital. If the proportioning valve is not functioning, the rear brakes are likely to lock up during deceleration. As such, a properly working proportioning valve is instrumental if you want to be safe during the instances of heavy braking.

Types of Proportioning Valves

Some brake proportioning valves are mounted on the master cylinder. After mounting them on the cylinder, the mechanic will attach them to the fluid ports located near the brake lines. The load-sensing valves have levers attaching them to the suspension system since they are located on the frame at the rear side of the vehicle. The third type of proportioning valves is mounted on the combination valve. These valves are part of the pressure differential switch and the metering valve. You will find these valves under the master cylinder. If your vehicle has drum brakes on the rear side, you need to regulate the pressure as too much loading can cause the brakes to lock. The proportioning valves reduce the amount of loading that goes to the drum brakes to prevent this eventuality.

ABS Systems

The new vehicles come with the electronic proportion technologies. Anti-lock braking systems serve the same purpose as the proportion valves. The ABS depends on an algorithm that calculates the slip ratio on each of the four tires based on the information from the speed wheel sensors. An ABS regulates the braking power, depending on the nature and curves on the road, as well as the condition of the tyres. With these systems, an algorithm calculates the slip ratio of all four tyres based on wheel speed sensors. The proportioning valves will modify the ABS, depending on the information from the brake line sensors.

Causes of Valve Failure

The proportioning valve can fail in different ways. Besides locking up the rear wheels, the proportionate valves might cause the car to nose-dive when you apply the brakes. In other instances, the emergency brakes might fail, meaning that the car will not stop fast enough when you apply the brakes suddenly. The modifications that you make on your car will have an impact on the brake balance. For example, the modifications that reduce the weight on the front axle, as well as those that increase the loading on the rear axle can affect the brake balance. Raising the vehicle will also affect the centre of gravity, causing the brakes to lose their balance.

How to Diagnose the Problem

As soon as you notice that the rear wheels are locking up, you need to verify that the proportioning valves have a problem. You need to find an empty parking lot where you can test the emergency brakes. You should speed up and make some rapid stops. Once you press the brake heavily, the rear wheels will lock up while the front wheels turn normally. The replacement of the proportionate valves will affect the brake bias.

Repairing the Braking System

Repairs that involve replacing the brake proportioning valves should be left to professionals. The reason is that you might mess up other parts of the brake. Since brakes are some of the most sensitive parts of the car, you do not want to skimp on the professional help. A professional mechanic will not only test the brakes and identify the problem, but such a professional will also insist on genuine parts. In addition, the mechanic will have some specialised tools that help to diagnose the failures that you cannot notice easily. Since the proportionate valves vary widely, a professional will identify the right type when it comes to replacement. Only a competent mechanic has the knowledge and tools required to restore the brake bias.