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Brake Fluid Loss

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2001 Mercedes-Benz SL500, 2001 Mercedes-Benz S55, 2001 Mercedes-Benz S500, 2001 Mercedes-Benz S430, and 2001 Mercedes-Benz ML430. However, it is still accessible from the selected car via links, so may be relevant.
  1. If brake fluid loss is not externally visible, remove brake master cylinder. See MASTER CYLINDER  under REMOVAL & INSTALLATION. Inspect brake booster for brake fluid. If brake fluid is not present, inspect all system hydraulic connections and repair as necessary. If brake fluid is present, remove brake fluid from brake booster and place into a measuring beaker.
  2. If brake fluid volume is .11 qts. (.10L) or less, brake booster can be reused. The rolling diaphragm in brake booster is resistant to brake fluid, but not the reaction disc and poppet valve in the control element. When volume of brake fluid in brake booster is .11 qts. (.10L) or less, the brake fluid cannot reach the reaction disc or poppet valve in an installed brake booster. If volume of brake fluid in brake booster is more than .11 qts. (.10L), the brake booster is damaged must be replaced. See BRAKE BOOSTER  under REMOVAL & INSTALLATION.
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