Many people know that brake discs and brake calipers are one of the most important automotive parts. But how many car owners know what is brake maintenance? And what do you need to do to pay attention to brake maintenance? Then the next small series introduces some common brake maintenance knowledge.
The purpose of the brakes is to slow down. Stepping on the brakes means wasting a little bit of gasoline. Therefore, it is recommended that the owner should reasonably control the speed of the vehicle while driving, and try to brake as much as possible to achieve a smooth start and smooth braking, and also achieve better fuel economy. Even if you are forced to step on the brakes, you should consider reducing the time and frequency of braking.
Generally, the engine has a deceleration effect. In the case of no emergency, it is necessary to make full use of the engine to decelerate: for example, there is a red light at a distance in the front, and there are few cars on the road. At this time, the throttle should be released to make the engine stagnate. Speed, instead of rushing to hang on the brakes; when downhill, the gear position of the transmission should be continuously reduced according to the length of the ramp and the speed of the vehicle, and the engine braking speed is used to keep the driving speed of the vehicle within a controllable range. It is not possible to step on the brake pedal for a long time downhill, which will cause the temperature of the brake system to rise sharply, which may cause the brake effect to drop or even the brake to fail.
In addition, the braking distance of the brakes with the gears is less than the neutral braking distance, which is especially important for high-speed or full-load vehicles.
In addition, the frequent use of emergency braking not only shortens the service life of the chassis components, but also increases the wear of the brake system and tires.
In a real maintenance brake system project, it is most important to check the brake fluid level regularly, at least once a month.
If the brake oil is always missing for a long period of time and it is always added, it basically indicates that the brake system is faulty and should be checked. From the color of the brake oil can also find some clues, the brake oil should not be too dark, and should not look like burnt, if it is, then there is a problem, but this will not happen often. Because the brake oil has water absorption characteristics, it will corrode the brake system without replacing it for a long time, which brings hidden danger to the vehicle.
Carefully wipe the dirt on the main cylinder before checking the brakes to prevent any dirt from falling into the storage tank. Remove the fasteners (usually the pins) and the cover. For cylinders without scale, keep the liquid level 6 mm from the top of the cylinder. If there is a scale, just keep the liquid level higher than the scale. If the master cylinder needs to be refueled, add heavy duty brake oil that meets DOT3 or DOT4 specifications. The brake fluid level is high and low, the higher the brake fluid level, the better the safety. In addition, because the brake fluid is highly corrosive, gloves should be worn during operation. Brake oil can also destroy the topcoat, so try to avoid the brake fluid on the paint.
Some considerations are also important during the inspection of the brake system. The first is not to inhale asbestos dust. Dust is raised when a dry brush or compressed air is used to remove dust and dirt from the brake system. Because it is extremely easy to contain asbestos fibers, it is easy to damage health. Dust and mud should be treated with an asbestos-only vacuum cleaner and should be dust-proof. If you do not have a vacuum cleaner, you should maintain a well ventilated area with a certified anti-virus respirator when servicing the brake assembly.
In addition to frequent attention to the brake fluid level, the inspection of the brake pads is also very important. Due to the long cycle of brake maintenance, many owners are easy to ignore. When the problem is found, the brake pads are often worn out. This has great security risks.
Brake maintenance and suspension maintenance are critical. First of all, the owner must pay attention to some details during the driving process. The hard-wearing brake pads have a faint sound when driving, because of the high content of metal powder and coarse particles. This is normal; however, if the sound is loud and the brakes feel very stiff when braking, It may be that the brake pads have been excessively consumed, and the bottom plate behind the brake pads is frictionally generated with the brake discs, which causes early wear of the brake discs and affects the braking effect. In severe cases, the brakes may also fail. In addition, due to inertia during braking, the center of gravity of the vehicle will move forward. The requirements for the front brake system are higher, the wear of the front brake shoe is faster than that of the rear brake shoe, and daily maintenance is required.
Generally speaking, for vehicles with a total mileage of less than 100,000 km, only the naked eye inspection is required for brake maintenance and suspension maintenance. The inspection items include: whether the remaining thickness of the friction layer of the brake pad of the disc brake is sufficient, based on 3 mm. Whether the surface of the disc brake is evenly worn; whether the shock is leaking oil; pressing the body can check whether the damping is normal; whether the brake is normal when driving. However, sometimes during maintenance, some repair shops will let the owner change the brake disc. This is still determined according to the degree of wear of the brake pads. When to replace it depends on whether the remaining thickness and wear are uniform, and the brake force is balanced. It does not mean that the brake disc needs to be replaced after changing the brake pads twice. Car owners need more attention when repairing.
In addition, professional maintenance requirements for the entire brake system include:
High temperature protection of brake pads: prevent corrosion of the brake system, prevent the brake pads from being killed by the high temperature surface, eliminate the squeal of the brake pads, maintain good lubrication durability, and need to withstand high temperature up to 1400oC or more containing ceramic components.
Lubrication and maintenance of brake cylinder: Lubricate the movable shaft and cup of the brake cylinder, keep the pump bushing soft, extend the service life of the pump, and use the fully synthetic brake cylinder lubricant.
Brake disc cleaning: Quickly clean the brake disc, brake drum and any parts of oil, dirt and friction dust; tire screw, brake disc and rim contact surface anti-rust lubrication; prevent corrosion, prevent screws and surfaces from being bitten by heat, easy to disassemble , need to withstand high temperature up to 1100oC or more containing aluminum products.
For the average car owner, their understanding of car maintenance is only a superficial level of oil change, body cleaning beauty and fault repair, but little is known about the brake system related to life's own safety, and did not attract enough attention. In fact, a good braking system is the guarantee of life. How big is the horsepower of the car? How fast it can drive is not the most important. It is a good car to be able to put the car.
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