What is a car vacuum booster
The automotive vacuum booster is a device that uses vacuum (negative pressure) to amplify the force applied by the driver to the brake pedal. It is mainly used to assist manual operation and reduce the driving burden.
Structure and Position
The vacuum booster is usually located between the brake pedal and the brake master cylinder, and is combined with the master cylinder as a component for easy installation. A part of the master cylinder will penetrate into the booster housing, forming a hydraulic pipeline connection.
Working principle
The vacuum generated through the engine intake manifold forms a pressure difference, which drives the diaphragm to move and amplifies the force applied by manually stepping on the pedal. The specific process includes:
When the engine is running, the vacuum in the intake manifold is introduced into the servo air chamber of the booster.
The diaphragm moves under the action of pressure difference, and the thrust generated by human force and vacuum is superimposed by the push rod.
The amplified thrust directly acts on the master cylinder piston to achieve the braking effect.
Function and Role
It is mainly used in the auxiliary braking system to reduce the force required by the driver to step on the pedal and enhance the ease of handling. This device only functions during braking and is a core component of the servo braking system.
When a car vacuum booster is damaged, the main symptoms are increased brake pedal travel, significantly weakened braking force, brake vibration and abnormal noise, and the instrument warning light coming on and other key symptoms.
Youdaoplaceholder0 main fault manifestations
Youdaoplaceholder0 The brake pedal travel becomes longer and the force is heavier .
When the brake pedal is depressed, the stroke increases significantly and greater force is required. This is a typical feature of vacuum assist failure.
Youdaoplaceholder0 braking force significantly decreases .
Even if you press the pedal hard, the vehicle still has difficulty decelerating in time and may completely fail during emergency braking.
Youdaoplaceholder0 Brake jitter and abnormal noise .
Unstable system pressure can cause abnormal friction of brake discs and pads, manifested as pedal vibration or accompanied by sharp hissing sounds.
Youdaoplaceholder0 instrument warning prompt .
Some vehicles will indicate an abnormal booster through the brake system fault light.
Youdaoplaceholder0 oil leakage and abnormal pedal return .
Oil leakage at the external connection of the booster, slow or no return of the brake pedal to its original position, may be accompanied by unstable engine idling.
Youdaoplaceholder0 typical cause of failure
Youdaoplaceholder0 Seal aging : Long-term high temperature or lack of maintenance causes the sealing ring to harden and crack.
Youdaoplaceholder0 vacuum tube leakage : If the vacuum pipeline connected to the engine is damaged, it will lose its power-assisting effect.
Youdaoplaceholder0 Internal component wear : Diaphragm rupture or spring failure directly affects the assist function.
Youdaoplaceholder0 Countermeasures proposal
Youdaoplaceholder0 Immediately check the brake fluid level : a low fluid level may increase the load on the booster.
Youdaoplaceholder0 Test the sealing performance of the vacuum pipeline : Use a vacuum gauge to check if the pipeline is leaking.
Youdaoplaceholder0 Priority replacement of assembly parts : Vacuum boosters are usually not repairable and need to be replaced as a whole to ensure reliability.
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