Re 2 Bleeding the ABD circuit

Preparation: Bleed brakes in conventional manner (for master cylinder circuits, refer to p. 47-12 ...13).

The bleeder device remains connected (switched on) when the ABD circuit is bled. In addition, the booster circuit must be depressurized. Bleeding pressure: approx. 1.5 to 2.0 bar. Overflow hose (vent) is blocked with hose clamp at brake fluid reservoir.

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

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

Switch off ignition and disconnect System Tester.

Switch off and disconnect bleeder device. Remove hose clamp from overflow hose (vent).

Fill pressure accumulator completely by reconnecting the electrical connector.

Open rear right bleeder valve (use red pient bottle).

Correct brake fluid level after the pump unit has switched off. Never top up beyond the "Max. mark".

Press Start button on System Tester. This causes specific functions in the hydraulic unit to be started (return pump, switchoff valve and switchover valve are triggered).

Bleed until bubble-free brake fluid escapes. Also depress brake pedal (pump at pedal) across the entire pedal travel (to the stop) during the entire bleeding process (at least 10 times).

Caution: Double the pumping cycles on high-mileage vehicles or older vehicles but use only half the brake master cylinder stroke in these cases (to avoid damage to the master cylinder, i.e. primary cups).

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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