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Buy Brake Proportioning Valve Online

Also known as: Brake force distributor, Brake Force Distributor, Brake Load Valve

OEM & aftermarket brake proportioning valve from top brands — compare prices, check fitment, order with free delivery

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Shop 381 brake proportioning valve from 20 trusted brands including LPR, ATE, BOSCH. Compare prices, check vehicle compatibility, and get free delivery on orders over £99.

Brake Proportioning Valve for the top car models

Alfa Romeo133

Brake Proportioning Valve buying guide — what to know before you buy

The brake proportioning valve (load-sensing valve) reduces hydraulic pressure to the rear brakes to prevent premature rear-wheel lock-up under heavy braking. It adjusts the front-to-rear brake bias based on vehicle loading. A faulty valve causes rear-wheel lock-up or insufficient rear braking force, compromising safety and stability.

Proportioning valve failure symptoms

A malfunctioning proportioning valve alters the brake balance, which is particularly dangerous in wet or slippery conditions.

Rear wheels lock up prematurely under moderate braking
Vehicle nose-dives excessively — insufficient rear braking force
ABS activates at the rear much sooner than expected
Rear brakes feel either too aggressive or too weak compared to the front
Uneven brake pad wear between front and rear

Valve replacement

The proportioning valve is typically mounted on the rear axle or body with a link to the suspension to sense vehicle load.

Identify the valve location — usually on the rear axle beam or body, with a spring link
Check the sensing spring and lever for correct adjustment before condemning the valve
Bleed the rear brakes after replacement to remove trapped air
Verify brake balance with a road test on a safe, dry surface

Frequently Asked Questions

Are brake proportioning valve and brake force distributor the same thing?

Yes. "Brake Proportioning Valve" and "Brake force distributor" refer to the same car part. Other common names include Brake force distributor, Brake Force Distributor, Brake Load Valve. The part is the same regardless of which name is used.

What does the brake proportioning valve do?

It reduces hydraulic pressure to the rear brakes to prevent rear lock-up. Rear brakes need less pressure because weight transfers forward under braking, reducing rear tyre grip.

Can a faulty proportioning valve cause rear wheel lock-up?

Yes. A valve stuck in the open position sends full line pressure to the rear brakes, causing them to lock before the fronts, which can cause the vehicle to spin.

Do modern cars have proportioning valves?

Many modern cars with ABS rely on the ABS system to manage front-to-rear bias electronically. Older vehicles and some commercial vehicles use mechanical proportioning valves.

How do I adjust the brake proportioning valve?

The adjustment is typically set by the sensing spring link length. Follow the manufacturer's procedure to adjust the lever arm position relative to the rear axle height.