What is the rear brake disc of a car
The rear brake disc of a car is the core component of the braking system. It is usually made of alloy steel or cast iron and is fixed to the rear wheel to rotate with the wheel. When braking, the brake caliper clamps the brake disc to generate friction, achieving deceleration or stopping.
Main functions
Assist the front brake disc to maintain braking balance and prevent the tail from swinging during emergency braking.
Improve heat dissipation efficiency, reduce weight and enhance braking effect through air duct design (such as the SAIC Maxus V80 model).
Structural features
Metal disc: Common heat dissipation holes on the surface, it has both weight reduction and heat dissipation functions.
Cast iron material: Thin-walled design is prone to porosity defects, and the casting process must be strictly controlled.
The association with other components
Compared with drum brakes, disc brakes dissipate heat faster and are easier to maintain, but they need to be combined with a high oil pressure system to enhance braking force.
The main function of the rear brake disc of a car is to provide braking force to the rear wheels, helping the vehicle slow down, stop or maintain a stable speed when driving downhill, while ensuring driving safety.
Braking function
The rear brake disc is clamped by the brake caliper to generate friction, thereby achieving braking control of the rear wheels. Its functions include
Forced deceleration or stopping: Work in conjunction with the front wheel brakes to jointly slow down the vehicle's speed.
Stable parking: When pulling the handbrake, the rear brake disc prevents the vehicle from rolling back.
Downhill speed control: Maintain stability during downhill driving through continuous friction.
Stability and safety
The rear brake disc assists the front wheels in braking during the braking process, balances the distribution of braking force, prevents the rear of the vehicle from swaying, and especially enhances handling stability during emergency braking or on slippery roads.
Heat dissipation and durability
The rear brake discs usually adopt a ventilation design (with air ducts), which dissipates heat through air convection, reducing the risk of overheating during continuous braking and preventing brake fade.
Faults in the rear brake discs of a car may be caused by brake pad wear, brake disc deformation, brake fluid leakage or caliper failure, etc. Maintenance should be carried out based on specific symptoms.
Common causes of faults
Youdaoplaceholder0 Brake pad wear : Long-term use causes the brake pads to become thinner or wear unevenly, and new brake pads need to be replaced.
Youdaoplaceholder0 Brake disc deformation/rust : Uneven or rusted surface of the brake disc will affect the braking effect. Minor rust can be treated by physical rust removal, while severe rust requires replacement.
Youdaoplaceholder0 Brake fluid problem : Brake fluid leakage or insufficiency can lead to a decrease in braking force. It is necessary to check the brake fluid lines and replenish or replace them.
Youdaoplaceholder0 caliper failure : Damage or jamming of the caliper distributor may cause the brake pads to fail to return to their original position. The calipers need to be inspected or replaced.
Maintenance suggestions
Youdaoplaceholder0 Check the thickness of the brake pads : if it is less than 3mm, replace them immediately.
Youdaoplaceholder0 Clean brake discs : After rain or when there is a lot of dust, use a special cleaner to remove rust and dirt.
Youdaoplaceholder0 Professional inspection : If the brake discs are severely deformed or the calipers are faulty, it is recommended to have them inspected at a 4S store or a professional repair point.
preventive measure
Regularly maintain the braking system and check the condition of the brake pads and brake discs every 20,000 kilometers.
Avoid prolonged sudden braking or continuous braking when going downhill to reduce high-temperature oxidation.
Try to avoid parking for a long time after driving in the rain to prevent the brake discs from rusting.
When the brake disc is damaged, the vehicle will exhibit various abnormal phenomena, mainly including decreased braking performance, abnormal noise, shaking, abnormal appearance and brake deviation , etc. The following is a detailed description of the specific symptoms:
Abnormal braking performance
Youdaoplaceholder0 Extended braking distance or weak braking : The driver needs to press the brake pedal deeper to achieve the original braking effect, feeling that the vehicle "cannot stop". This is usually due to severe wear of the brake disc or an uneven surface, resulting in a decrease in friction.
Youdaoplaceholder0 Abnormal feedback of the brake pedal : The pedal may rebound and push against the foot, or the stroke may become longer and the force uneven. This is mostly caused by deformation or uneven wear of the brake disc.
When braking, a sharp metallic friction sound is emitted, especially when the brake is lightly pressed. This is often a direct signal that the brake disc has worn to its limit or grooves have appeared on its surface.
When braking at high speed, if the steering wheel or the vehicle body shows obvious shaking, it is mostly due to the deformation of the brake disc caused by high temperature or uneven wear, resulting in unbalanced force during braking.
If any of the above phenomena occur, it is recommended to promptly check the thickness of the brake disc (measured with a vernier caliper to ensure it is not less than the minimum thickness indicated in the vehicle manual) and its appearance to prevent safety accidents caused by brake disc failure.
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