The function of the rear brake pad assembly of the car
The rear brake pad assembly is a crucial component in the vehicle's braking system, and its main functions are as follows:
- Provide braking force: When the brake pedal is depressed, the rear brake pads come into contact with the brake disc (or brake drum) through the friction material, generating frictional force to slow down or stop the vehicle.
- Balance the braking force of the entire vehicle: Working in coordination with the front brake pads, it distributes the braking force of the front and rear wheels reasonably to prevent the vehicle from losing control during braking (such as nodding or swerving), thereby enhancing braking stability.
- Assist in parking braking: In the rear wheels with drum brakes, the rear brake pads also often serve as the actuating component of the handbrake (parking brake), achieving parking fixation through the tensioning of a steel cable.
- Protect other braking components: By absorbing and converting kinetic energy into heat energy, it reduces the direct impact on the brake disc, caliper, and other components, thereby extending the lifespan of the entire braking system.
- Enhance driving safety: A well-maintained rear brake pad ensures that the vehicle remains controllable during emergency braking, reducing the risk of accidents.
The rear brake pads are typically composed of three parts: a steel plate (backing plate), a bonded insulation layer, and a friction block. The friction block directly participates in the braking process, while the insulation layer prevents heat from being transmitted to other components.
Note: Although rear brake pads wear out relatively slowly (generally replaced after 6-100,000 kilometers), they are greatly affected by driving habits, road conditions, etc., and require regular inspection.
Damage to the rear brake pad assembly is a serious issue that seriously affects driving safety. It must be dealt with immediately. According to authoritative public information, the following are key information and response suggestions:
Common manifestations of rear brake pad damage:
- Abnormal braking noise: such as sharp sounds, friction sounds, or metal scraping sounds .
- Longer braking distance: after braking, the vehicle slows down slowly, and deeper pedal depression is required to stop .
- Vibration of the brake pedal or steering wheel: indicates that the brake disc may be uneven or the brake pads are worn unevenly .
- Abnormal smell of burning .
- Significant reduction in braking effect: in severe cases, it may cause "unable to brake" or failure .
- Risk of continuing to drive
If the rear brake pads have "run out" or are severely damaged, it may lead to:
- Significant reduction in braking efficiency, increasing the risk of rear-end collisions and other accidents .
- Direct wear of the brake disc, resulting in more expensive repairs (replacing the brake disc is much more costly than the brake pads) .
- Damage to other components of the braking system, such as calipers, master cylinders, etc. .
Suggested handling steps:
- Immediately stop driving : If there are obvious brake failure or abnormal noise, do not continue driving .
- Contact professional repair institutions :
It is recommended to go to a regular auto repair shop or 4S store for inspection and replacement.
You can search for nearby certified repair points through Autohome or Yiche.com.
- Replacement requirements:
- Replace in pairs : It is recommended to replace the brake pads of both the left and right rear wheels simultaneously to ensure balanced braking force .
- Check related components : Check if the brake disc, brake caliper, brake oil pipe, etc. are damaged simultaneously .
- Self-replacement precautions (only for experienced individuals):
Special tools (such as piston returners) are required;
For electronic handbrake models, it is necessary to use a diagnostic computer to retract the caliper piston;
After installation, perform a test brake and confirm that the torque is up to standard .
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