Procedures

AR25.20-P-0070P Bleeding Clutch Actuation
- Transmission 716.6





























Workshop equipment/MB testers

Where brake fluid loss is not visible, it should be checked whether brake fluid has entered the brake booster through a leaking secondary seal in the tandem master brake cylinder: In this case the tandem master brake cylinder has to be removed and any ingressed brake fluid drained off and emptied into a measuring cup.

If there are more than 100 cm3 of brake fluid in the brake booster, the brake booster must be replaced.

The power diaphragm in the brake booster is resistant to brake fluid, but not the reaction disk and the poppet valve in the master control unit. Brake fluid should therefore only be drawn off when the brake booster is installed. Where there is less than 100 cm brake fluid in the brake booster for an installed brake booster, brake fluid will be unable to reach the reaction disk or the poppet valve.

On models 129, 140 up to May 94 with ASR the connections of the pressure reservoir and charging pump in the front left wheelhouse should be checked for signs of leaks. As from June 94 the charging pump is no longer applicable for ASR V.

On model 129 with engines 119, 120 up to June 98, models 140 and 210 with engine 119 with ESP, the connections of the charging pump and charging piston unit in the front left wheelhouse should be checked for leaks.