Further to 2 Bleeding the lock cylinders and pressure lines

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These instructions apply only if:

the longitudinal or transverse lock cylinder has been replaced the hydraulic system was opened after the valve block (solenoid valves for longitudinal and transverse locks)

it is suspected that the bleeding condition of the lock control (lock actuating) is not optimum. Explanation:

Checking of the bleeding condition in the workshop is too time-consuming or not possible. For this reason, perform bleeding again if in doubt.

If the pump assembly, pressure accumulator or the valve block has been replaced or removed, these instructions are not sufficient. Other work must be performed previously. Description as from Page 47-6.

The underbody cladding must be dismantled at the rear for the following steps. For space reasons, undo or also dismantle the assembly under-protection if necessary. In addition, the battery should be in well-charged condition.


Fill the fluid reservoir with new brake fluid up to the top edge.

Connect the system tester 9288 to the diagnosis socket (right in the passenger foot-well) with the connecting cable 9288/1.

- Switch on ignition and tester. Select vehicle type and then the system PDAS. Go into the drive link menu.

Select the item "Bleeding" in the drive link menu. Open the bleeder valve on the transverse lock cylinder and remove brake fluid after pressing the start key indicated by the tester.

Continue bleeding until brake fluid free of air bubbles emerges (max. 300 cm3). Press the stop key and close the bleeder valve.

Change to pressure reduction position with the tester.

Fill with the new brake fluid (depending on quantity removed).

- Then operate the solenoid valve again with the system tester 9288 (in the drive link menu / item "Bleeding") and also remove brake fluid at the bleeder valve of the longitudinal lock cylinder until the fluid is free of air bubbles (remove max. 300 cm3).

Disconnect the system tester and correct the brake fluid level (refer to Page 47-4). Do not fill over the "max. marking" under any circumstances.

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