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Do You Need to Bleed the Entire Brake System When Replacing a Brake Caliper?

1 Answers

OOwen

07/30/25 7:50am

No, bleeding the entire system is not necessary. The working principle of the brake master cylinder is that when the brake pedal is pressed, the piston inside the master cylinder is pushed by the brake pedal, and then the push rod comes into play. Here are the relevant introductions: Hydraulic Brake Master Cylinder: The hydraulic brake master cylinder transmits brake fluid through the brake lines to the pistons of each brake caliper, causing the brake pads to create friction with the inner surface of the brake drum, thereby achieving the braking effect. Pneumatic Brake Master Cylinder: The working principle of the pneumatic brake master cylinder is to act as a valve. The difference is that after braking, the hydraulic master cylinder controls the brake fluid to flow back to the reservoir. Vehicles equipped with air brakes usually have large air storage tanks, and after braking, the air is directly discharged. This explains why the exhaust sound of large trucks is so loud.

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