What does a vacuum-assisted braking system mean?
1 Answers
Vacuum boosters are a type of brake booster used to assist braking. More details about the vacuum-assisted braking system are as follows: 1. Starting the engine: When the engine is in the intake stroke, the vacuum in the intake manifold is greater than that in the rear chamber of the vacuum booster. At this time, the vacuum damping valve opens, and the engine draws air from the rear chamber into the engine through the intake manifold via the vacuum damping valve. When the vacuum in the rear chamber exceeds that in the intake manifold, the vacuum damping valve closes, creating a vacuum and negative pressure in the rear chamber. 2. Pressing the brake pedal: The one-way valve inside the vacuum booster closes, and the pressure relief valve opens. Air enters the front chamber of the vacuum booster through the pressure relief valve, creating positive pressure. Since the pressure in the front chamber is greater than that in the rear chamber, a pressure difference is generated. Under the positive pressure of the front chamber, the diaphragm is pushed toward the rear chamber, overcoming the return spring force of the pressure plate to push the brake master cylinder's push rod, which in turn moves the first-stage piston of the brake master cylinder, generating vacuum assistance. 3. Releasing the brake pedal: The one-way valve inside the vacuum booster opens, and the pressure relief valve closes. Air from the front chamber flows into the rear chamber through the one-way valve, equalizing the pressure in both chambers. The pressure plate and diaphragm return to their original positions under the action of the pressure plate return spring.
