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What is the working principle of the brake pump?

1 Answers

StBrantley

07/30/25 8:05am

The working principle of the brake pump is that when the brake is pressed, the piston inside the master brake cylinder is subjected to the thrust from the brake pedal, which then acts through the push rod. Depending on the vehicle type, it is divided into two types: air brake master cylinder and hydraulic brake master cylinder. The following is an introduction: 1. Hydraulic brake master cylinder: When the brake is pressed, the piston inside the master brake cylinder is subjected to the thrust from the brake pedal, which then acts through the push rod, transmitting the brake fluid through the pipes to the pistons of each brake slave cylinder. This then pushes the brake shoes to expand outward, causing the brake pads to rub against the inner surface of the brake drum, thereby achieving the braking effect. 2. Pneumatic brake master cylinder: The working principle of the pneumatic brake master cylinder is actually not much different from that of the hydraulic brake master cylinder, both serving as valves. The difference is that after braking, the hydraulic brake master cylinder controls the brake fluid to flow back into the reservoir. Vehicles using air brakes are usually equipped with several relatively large air storage tanks, and after braking, the air is directly discharged, which explains why the exhaust sound of large trucks is so loud.

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