Menu: Bleed (ABS/ABD 5)

Important notes

The Bleed menu is not available (not required) on solo ABS Systems. This menu is used to bleed the ABD secondary circuit in the hydraulic unit on vehicles fitted with ABD. Caution: This additional bleeding operation is only required after conventional bleeding and only when the hydraulic unit has been replaced or removed and refitted. Bleeding the secondary circuit may also be required in the case of excessive pedal travel, provided that the system has been bled correctly before.

Bleeding the ABD circuit

- Preparatory operations: Bleed brakes in conventional manner.

- Leave the bleeding device connected (switched on) to bleed the ABD circuit. Bleeding pressure approx. 1.5...2.O bar. Overflow hose (for venting) on expansion tank is clamped off with a hose clamp.

- Connect System Tester 9288 to diagnostic socket. Switch ignition on. Select "Bleed" menu.

- Open rear right bleeder valve (Use bottle to catch fluid).

- Press start button on System Tester. This causes specific functions in hydraulic unit to be activated (Return pump, ASV valve and switchover valve are activated). Bleed system until the escaping brake fluid is bubble free. Also actuate (pump) the brake pedal during the entire bleeding process at least 10 times across the full pedal stroke (to the pedal stop). Caution: On high-mileage or older vehicles, double the pump cycles and use only half the brake master cylinder stroke (to avoid damage to brake master cylinder / primary cup).

- Close rear right bleeder valve. Then press stop button on System Tester immediately.

- Switch off ignition and disconnect System Tester.

- Switch off and disconnect bleeding device. Top up brake fluid if required.