The function of the rear brake disc of the car
The rear brake disc is the core component of the rear wheel braking system. Its main function is to generate braking force through friction with the brake pads, causing the vehicle to decelerate or stop, and assisting in maintaining the balance and stability of the vehicle during braking.
Providing rear wheel braking force: When the driver steps on the brake pedal, the brake caliper will clamp the rotating rear brake disc, converting the vehicle's kinetic energy into heat through friction, thereby achieving the deceleration or stopping of the rear wheels.
Ensuring braking stability: The rear brake disc assists the front brake disc during braking, balancing the braking force distribution between the front and rear wheels, preventing the vehicle from swaying at the rear or losing control, especially crucial on emergency braking or on slippery roads.
Maintaining stability in a specific driving state: During reversing, downhill driving, or parking, the rear brake disc helps maintain the vehicle's posture stability, enhancing overall safety.
Faults in the rear brake disc of a car may cause uneven braking, vehicle shaking, abnormal noises, and even brake failure, posing serious safety hazards. According to recent authoritative public information, the common causes and corresponding solutions are as follows:
Main fault causes:
Uneven wear of brake pads or poor quality of brake pads: Leading to deep grooves or steps forming on the surface of the brake disc, especially when not fully worn or using non-original parts .
Deformation or thermal attenuation of the brake disc: Frequent hard braking, long continuous braking causing uneven heating of the disc, resulting in warping deformation. A deformation of more than 0.05mm requires replacement .
Brake booster failure: Stuck piston or corroded guide pin causing continuous friction of one side's brake pad, resulting in abnormal high temperature, blackening, or accelerated wear .
Uneven brake system pressure: Blocked oil pipes, bubbles, or length differences causing imbalance in the left and right braking forces .
Electronic parking brake or positioning issues (such as Fanghe Baoba 5 and other models): Stuck electronic parking brake motor, four-wheel alignment deviation (such as abnormal camber angle) can also accelerate the abnormal wear of the rear brake disc .
The brake disc cannot rotate or locks up: May be caused by insufficient lubrication, excessive wear of the brake pads, stuck booster, or incorrect bearing installation .
Typical symptoms:
Vehicle shaking or deviation during braking
Rhythmic vibration of the brake pedal feedback
Abnormal heating in the rear wheel area (touching feels hot)
Abnormal noise (such as sharp sounds, scraping sounds)
Brake fault light turns on
Suggested handling steps:
Stop immediately for inspection: If there are obvious braking abnormalities, stop driving to avoid further damage.
Initial self-check:
Check the brake fluid level is normal;
Confirm the handbrake is fully released;
Observe if there is smoke, burnt smell, or abnormal high temperature in the rear wheel area .
Professional repair:
Disassemble and inspect the rear braking system, measure the thickness and flatness of the brake disc;
Replace the worn-out brake disc and brake pads (suggested to use original or high-quality parts);
Clean and lubricate the guide pin of the booster, and replace the booster assembly if necessary;
Perform four-wheel alignment calibration .
Brake system warm-up and maintenance:
Replace and perform about 200 kilometers of gentle warm-up;
Check the thickness of brake pads every 10,000 kilometers (below 3mm requires replacement), and check the brake fluid every 5,000 kilometers .
Safety reminder: The braking system directly relates to driving safety. Any abnormalities should be handled by a professional repair institution as soon as possible, and do not delay. You can make an appointment for inspection at a 4S store or a professional chain repair shop.
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