CLK 350 Cabriolet (209.456) V6-3.5L (272.960) (2006)
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Brake Fluid: Initial Inspection and Diagnostic Overview
AH42.10-P-9406-02A Notes on externally invisible brake fluid loss
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 must therefore only be suctioned off when the brake booster is installed. Where there is less than 100 cm3 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 to May 94 with acceleration slip regulation (ASR) the connections of the pressure reservoir and the charging pump in the left
front wheelhouse should be checked for leaks. As from June 94 the charging pump is no longer applicable for ASR V. On model 129 with engine 119,
120 up to June 98 and models 140 and 210 with engine 119 and Electronic Stability Program (ESP), the connections of the charging pump and
charging piston unit in the left front wheelhouse should be checked for leaks.
