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Bleeding a dual-brake system

Bleeding a dual-brake system Servo Brake pedal Master cylinder Reservoir Dual system bleed sequence 4 3 1 2 Because the two circuits are separate, bleeding is two separate operations. Start with the wheel nearest to the master cylinder in each case.

The front and rear brakes of a dual-brake system have separate hydraulic circuits.

The configuration can vary depending on the manufacturer.

The brake pipes also pass through a balance unit which limits pressure to the rear brakes to prevent the back wheels locking when the weight of the car is thrown forwards during braking.

On some cars, the rear brakes cannot be bled if the weight is taken off the wheels, and the job must be carried out with the car on the ground.