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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.
A malfunctioning proportioning valve alters the brake balance, which is particularly dangerous in wet or slippery conditions.
The proportioning valve is typically mounted on the rear axle or body with a link to the suspension to sense vehicle load.
Commonly searched OE numbers fitting Brake Proportioning Valve from the TecDoc catalogue.
Common original equipment numbers linked to stocked alternatives.