What are the rear brake pads of a car
Youdaoplaceholder0 The rear brake pads of a car are key components located on the rear wheels and responsible for braking. They are an important part of the braking system and are mainly composed of friction materials. They generate braking force through friction to achieve deceleration or stopping.
Function and Structure
The rear brake pads are fixed on the brake disc and come into contact with it through friction pads, using friction to slow down the vehicle. Its structure usually consists of steel plates, insulation layers and friction material layers, and the design focuses on high-temperature resistance and wear resistance.
The difference from the front brake pads
The load on the rear brake pads is smaller, and their replacement cycle is usually longer than that of the front brake pads. The front brake pads wear out faster as they bear more braking force and need to be inspected more frequently.
Working principle
When braking, the brake calipers press the brake pads against the brake discs. The heat generated by friction will change the coefficient of friction (μ), affecting the braking force. The rear brake pads need to adapt to temperature changes to ensure braking balance.
Daily maintenance suggestions
Regularly check the thickness of the brake pads (usually if they are less than 3mm, they need to be replaced), abnormal noises or a decline in braking effect to avoid safety hazards caused by wear.
The working principle of the rear brake pads of a car is to convert the kinetic energy of the vehicle into thermal energy through friction, thereby achieving deceleration or stopping. The core of it is to generate braking force through the friction between brake pads and brake discs (or drums), and at the same time, it needs to be combined with a hydraulic system to transmit pressure and dissipate heat to ensure braking effect.
Core role
Deceleration and stop: The kinetic energy of the vehicle is converted into thermal energy through friction, reducing the vehicle speed until it stops.
Anti-rolling: When the vehicle is stationary (such as in the parking brake), the rear brake pads can assist in fixing the vehicle body to prevent it from sliding.
Working principle
Youdaoplaceholder0 friction braking
The brake pads come into contact with the rotating brake discs and generate braking force through friction. During the friction process, kinetic energy is converted into thermal energy, causing the vehicle to slow down.
Youdaoplaceholder0 hydraulic transmission
When the driver steps on the brake pedal, the master cylinder converts force into hydraulic pressure, which is transmitted to the calipers on the rear wheels through brake fluid, pushing the brake pads to clamp the brake discs.
Youdaoplaceholder0 heat dissipation and failure prevention
The braking system should have good heat dissipation capacity to prevent hydraulic failure or brake fade (reduced braking force) caused by high temperatures.
Precautions
Youdaoplaceholder0 anti-locking : If the braking force is too large, the tires may lock up, causing dynamic friction to replace static friction, reducing friction and affecting steering. The ABS system can automatically adjust to avoid this problem.
Youdaoplaceholder0 Material selection : The material of brake pads should take into account both friction performance and high-temperature resistance. Different road conditions (such as ice and snow, dry roads) should be matched with corresponding grip.
The malfunction of the rear brake pads of a car may be caused by brake pad wear, failure of brake system components or improper adjustment . It is necessary to investigate and handle it based on specific symptoms.
Common types of faults
Youdaoplaceholder0 the brake does not return to position
Phenomenon: The brake pedal fails to rebound or rebounds slowly after being pressed.
Cause: The sub-pump piston is stained or the return spring has failed.
Solution: Clean the piston, replace the spring, and empty the air in the brake line.
Youdaoplaceholder0 brakes become soft/fail
Phenomenon: The brake pedal travel becomes longer or the braking force is insufficient.
Reasons: Insufficient brake fluid, deteriorated fluid quality, air intake in the brake line, wear of brake pads/discs.
Solution: Check the level and quality of the brake fluid. Replace the fluid or components if necessary.
Youdaoplaceholder0 Abnormal brake noise
Phenomenon: A sharp metallic friction sound is emitted when braking.
Reasons: The brake pads have become thinner, the brake discs have rusted or foreign objects have been embedded.
Solution: Replace the severely worn brake pads or grind the brake discs.
Youdaoplaceholder0 brake deviation/springback
Phenomenon: When braking, the vehicle body deviates from the direction or there is a bouncing sensation on the pedal.
Cause: Uneven braking force on the left and right sides, deformation of the brake disc or vacuum pump failure.
Solution: Check the flatness of the brake disc, adjust the braking force balance or replace the vacuum pump.
Troubleshooting and maintenance suggestions
Youdaoplaceholder0 Regular inspection : Check the thickness of the brake pads every 20,000 kilometers (normal thickness ≥5mm), and the brake discs should be replaced if the wear depth is ≤2mm.
Youdaoplaceholder0 Replacement standard : Brake pads should be replaced when they wear down to one-third of the remaining friction material. Grooves or deformations on the brake discs should be replaced simultaneously.
Youdaoplaceholder0 drum brake repair : The brake drum needs to be disassembled, the piston cleaned and new brake pads installed. Pay attention to adjusting the tension of the return spring.
preventive measure
Avoid frequent sudden braking and keep the brake fluid clean.
The braking system should be professionally inspected at least once a year.
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