2nd Step: Bleeding (secondary circuit)

Bleeding of the secondary circuit is only necessary if the hydraulic unit has been replaced and, after bleeding in the normal way (primary circuit), the brake pedal travel is excessive.

First bleed brakes as usual (primary circuit). Only then can you carry out bleeding of the secondary circuit with the Piwis Tester. The process is menu-driven. You must observe the specified sequence rear left, front left, front right, rear right.

To bleed the secondary circuit, the bleeding device remains connected to the brake fluid reservoir. Bleeding pressure is approx. 2.0 bar.

Throughout the entire bleeding process, the brake pedal must be operated cyclically (hold depressed for 2 to 3 seconds, then release slowly). After operating pedal for the last time, hold the brake pedal down and close bleeder valve.