BMW 34336786629 Brake Master Cylinder

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Brake fluid is highly corrosive and dangerous to the environment, so it must be disposed of properly. Begin by removing the heater bulkhead and partition wall near the reservoir. When working at the brake fluid reservoir located at the left rear of the engine compartment, detach the brake fluid level sensor connector and remove the reservoir cap. Use a clean syringe to empty the brake fluid reservoir. For manual transmission vehicles, disconnect the clutch brake master cylinder supply line from the fluid reservoir, being prepared to catch any dripping fluid, and secure the supply line in a vertical position to prevent excessive fluid loss. Plug open brake fluid lines and ducts to prevent leakage and contamination. Remove the brake fluid reservoir by pulling it vertically out of the brake master cylinder, then disconnect the brake master cylinder brake lines and plug them to prevent contamination. Remove the brake master cylinder mounting nuts and take out the cylinder. During reinstallation, ensure that all nuts, fluid couplings, thread bores, and mating surfaces are clean. Mount the brake master cylinder to the brake booster using a new sealing O-ring and new self-locking nuts, then connect the brake fluid lines to the brake master cylinder and reinstall the fluid reservoir with new sealing grommets. It is important to align the brake master cylinder pushrod and booster pushrod, and avoid over-torquing the brake master cylinder mounting nuts to prevent damage to the brake booster and ensure proper vacuum build-up. Reconnect the clutch fluid supply hose if applicable, and complete the installation in reverse order of removal. Finally, top up with fresh brake fluid and bleed the entire brake system.