What is a rear brake pump for a car
The rear brake pump of a car is a core component of the vehicle's braking system, mainly divided into two types: the master cylinder and the slave cylinder.
Brake master cylinder
It is located at the master cylinder position of the braking system, responsible for converting the mechanical energy of the driver stepping on the pedal into hydraulic energy, and sending the brake fluid pressure to the slave cylinder through components such as the push rod and piston. Master pumps are divided into single-chamber and double-chamber structures and are commonly found in small cars and some agricultural vehicles.
Brake caliper
Installed near the wheels, it pushes the piston to move through hydraulic or pneumatic pressure, pushing the brake pads to rub against the brake discs or drums to generate braking force. For instance, the rear brake caliper of SAIC Maxus D90 achieves braking through hydraulic principles. The pistons inside it move under the action of high-pressure oil pushed by the master cylinder, pushing the brake pads to come into contact with the brake drums.
The two work in coordination. The master pump provides the pressure source, while the slave pumps perform the specific braking actions. It is necessary to regularly check the quality of the oil and the sealing of the oil pipes on a daily basis to ensure the safety and reliability of the braking system.
The main function of the rear brake pump (sub-pump) of a car is to transfer hydraulic pressure to the rear brake pads to achieve braking. When the driver steps on the brake pedal, the hydraulic pressure generated by the master cylinder is transmitted to the slave cylinders through the brake fluid, pushing the piston to move. This causes the brake pads to come into contact with the brake discs and generate friction, thereby reducing the vehicle speed or stopping the vehicle.
Specific functions
Youdaoplaceholder0 Hydraulic transmission : The hydraulic pressure generated by the master cylinder is distributed to the rear wheel slave cylinders to achieve synchronous braking of the front and rear wheels.
Youdaoplaceholder0 Pressure amplification : Through the hydraulic system, the force applied by the foot pedal is amplified to make braking smoother and more powerful.
Youdaoplaceholder0 Independent control : Each sub-pump independently controls the braking intensity of the corresponding wheel, adapting to different road conditions.
Common Faults
If abnormal brake pedal travel, difficulty in returning brake pads to their original position or oil leakage occurs, it is necessary to check the sealing of the caliper piston or faults in the hydraulic system.
The main manifestations of faults in the rear brake pump of a car are abnormal brake pedals, oil leakage, unusual noises and brake failure, etc. Timely maintenance or replacement is required.
Common fault manifestations
Youdaoplaceholder0 Pedal abnormality : When the brake is pressed, the pedal is either too soft or too hard, with abnormal rebound, and even a feeling of bouncing or sinking occurs.
Youdaoplaceholder0 Oil leakage phenomenon : Oil seeps from the connection between the sub-pump and the oil pipe, resulting in a decline in braking effect.
Youdaoplaceholder0 brake failure : Reduced brake sensitivity, extended braking distance, and in severe cases, complete failure.
Youdaoplaceholder0 Abnormal noise and deviation : Sharp abnormal noise occurs when braking, and the steering wheel obviously shifts to one side.
Youdaoplaceholder0 does not return to position : The pedal cannot rebound normally after the brake is pressed.
Cause of malfunction
Youdaoplaceholder0 Oil quality issue : Deterioration or impurities in the brake fluid can cause blockage of the oil pipes, increase the pressure of the master pump, and accelerate the aging of components.
Youdaoplaceholder0 Component wear : Aging of seals and wear of pistons and cylinder blocks lead to poor sealing.
Youdaoplaceholder0 usage habit : Frequent sudden braking accelerates fatigue damage to internal components.
Youdaoplaceholder0 Design defect : Some models have inherent design issues with fuel pipes or valves.
Handling suggestions
Immediately go to a 4S store or a professional repair point to replace the faulty caliper and check the quality of the brake fluid and the condition of the oil pipes. It is necessary to regularly check the quality of the oil on a daily basis and avoid high-intensity operations such as sudden braking.
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