What are the rear brake friction pads (for one vehicle) of the car?
"Car rear brake friction pads (one car set)" refers to a complete set of friction pad components used in the rear wheel braking system of a car. It usually consists of one pad for each of the left and right rear wheels, collectively called "a pair" or "one car set".
Key points
Name explanation:
"Rear brake friction pads" refer to the rear wheel brake pads, which are the key components in the car braking system that directly contact the brake disc and achieve deceleration through friction.
"One car set" is a common term used in the industry or on e-commerce platforms, meaning a complete set of friction pad components that are suitable for the braking system of the vehicle's front and rear wheels. However, depending on the context and industry conventions, "one car set" sometimes specifically refers to a pair (2 pads) for the rear wheels only, and this needs to be confirmed based on the product details.
Actual meaning (based on current time and authoritative information):
In most cases, "rear brake friction pads (one car set)" refers to a pair (2 pads) for the rear wheels, rather than four pads for both the front and rear wheels.
If you need to replace all the brake pads, you should clearly purchase a set of four pads (front and rear) for a total.
Key features:
It belongs to a safety consumable and needs to be checked regularly;
Common materials include semi-metallic, ceramic, and organic non-asbestos, etc.;
Replacement suggestion: Replace immediately if the thickness is less than 3mm or if there is a metallic friction noise;
The service life is generally 3–100,000 kilometers, depending on driving habits and road conditions.
Purchase suggestions:
优先选择 products certified by the national standard GB 5763；
Recommended brands include Bosch and Ferodo， etc.；
When replacing， both the left and right rear wheels should be replaced simultaneously to ensure balanced braking force. If you see the description "one vehicle payment" on an e-commerce platform (such as Taobao or JD), it is recommended to check the "compatible vehicle models" and "quantity included" on the product detail page to confirm whether it is only 2 pieces for the rear wheels.
The rear brake friction pads (commonly referred to as "one pair for one vehicle", meaning two pads for each rear wheel) are a crucial safety component in the car's braking system. Their functions mainly include the following aspects:
Assisting in deceleration and stopping: When the brake pedal is depressed, the rear brake friction pads come into contact with the brake disc (or brake drum) and generate friction, converting vehicle kinetic energy into heat energy, assisting in deceleration or achieving complete stop. Especially on downhill sections, they can reduce the burden on the front brakes and prevent them from overheating and failing.
Maintaining vehicle braking stability: The front and rear braking systems distribute braking force proportionally. The rear brake friction pads participate in balancing the vehicle's posture, preventing "nodding" or excessive steering during sudden braking.
Supporting the parking (handbrake) function: Whether it is a mechanical or electronic handbrake, it ultimately applies braking force through the rear brake friction pads to prevent the vehicle from sliding down the slope.
Protecting other braking components: In some designs, the rear brake will share part of the braking force, thereby reducing the wear on the front brake disc and extending the overall system lifespan.
Maintenance Tips: Although the rear brake friction pads wear slower than the front ones, it is recommended to check the thickness every 10,000 kilometers. If it is below 4 millimeters, it should be replaced promptly; after installation, it is necessary to run for 200-300 kilometers for "break-in", avoiding sudden braking to ensure stable performance.
If the rear brake friction pads (the "one pair for one vehicle" should be "one side" or "rear") fail, it usually means that the brake pads on the rear wheels have an abnormality. According to authoritative public information, the main reasons are as follows:
Common Causes
Excessive brake pad wear: This is the most common reason. When the thickness of the brake pad wears down to the limit (usually less than 3 millimeters), the embedded alarm wire will come into contact with the brake disc or break, triggering the instrument alarm.
Low brake fluid level: Insufficient brake fluid will affect the transmission of braking force and may also trigger an alarm.
Sensor failure: Damage to the brake pad wear sensor or abnormal signal will cause a false alarm.
Circuit problems: Loose wiring, short circuits, or oxidation of connectors may interfere with signal transmission.
Incorrect installation: Incorrect installation of the brake pads during replacement can lead to abnormal gaps or poor contact.
Other brake system component failures: Such as brake booster, ABS sensor, or master cylinder failure, may also indirectly trigger an alarm.
Recommendations for Handling
Stop immediately for inspection: If the alarm light is on, stop safely at a safe location and observe for any abnormal sounds, longer braking distance, or abnormal pedal.
Do not continue long-distance driving: The braking system is crucial for driving safety. Operating the vehicle with a faulty braking system may lead to serious accidents.
Visit a professional repair facility: It is recommended to have a diagnosis at a 4S store or a reputable repair shop. Use professional equipment to read the fault codes and check the thickness of the brake pads, sensor status, and hydraulic system.
Replace promptly: If it is confirmed that the brake pads have exceeded the limit of wear, replace them in pairs (both rear wheels on the same side should be replaced simultaneously), and it is recommended to replace the alarm wire.
Note: After replacing the brake pads, it is necessary to grind for about 200 kilometers to achieve the best braking effect. During this period, avoid sudden braking.
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