AH42.10-P-9406-02V Notes on Externally Invisible Brake Fluid Loss

AH42.10-P-9406-02V Notes on externally invisible brake fluid loss
- with Adaptive Brake (ABR) [model 211, 219]

In the case of brake fluid loss which is not visible, it should be checked whether brake fluid has entered the brake booster through a leaking secondary seal in the master brake cylinder:

^ Remove tandem master brake cylinder
^ Draw off any brake fluid which has entered and empty into a measuring beaker.

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 poppet valve in the master control unit. Brake fluid must therefore only be suctioned off when the brake booster is installed. With a quantity of up to 100 cm3 no brake fluid can get to the reaction disk or poppet valve when the brake booster is installed.