What is the reason for the BMW 523 rear wheel cylinder not retracting?

1 Answers
DeSimon
09/02/25 6:20am
BMW 523 rear wheel cylinder not retracting reasons: Not changing the brake fluid for a long time, causing internal rust in the brake wheel cylinder, fixing screws outside the brake wheel cylinder and suspension, then applying grease, finally installing the vehicle, and polishing with fine sandpaper. Brake system: The brake system consists of a master cylinder and wheel cylinders. Simply put, the master cylinder is where the brake fluid is stored, with oil outlet and inlet ports. When the brake pedal is pressed, the fluid in the master cylinder flows through the pipes to the wheel cylinders. When the wheel cylinders are pressurized, they push the brake pads, causing them to rub against the brake drum, thereby achieving braking. Precautions for replacing brake wheel cylinders: Before replacing the wheel cylinder, completely disassemble the new wheel cylinder, clean it with carburetor cleaner, then apply medical Vaseline for installation, followed by bleeding the air. It is also best to replace the brake fluid with new one, so the brake cylinder is less prone to rust.
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