Brake drum usage
The vehicle running, the brake pedal after stepping on the bottom, can not immediately brake, brake role is weak, the car continues to slide, check the road surface, tire no drag, pressure marks. There are several reasons
Brake shoe friction piece used for too long, serious wear, or mountain driving, brake use frequently, friction produces high temperature, friction piece surface layer ablation aging, not timely repair.
(2) brake shoe friction piece in the riveting process, the quality is not good, rivet loose shake; Improper or not timely adjustment of brake clearance; What about the slow response of vacuum booster brake drum? The fault performance in the use of brake tread air phenomenon, it and the total pump lack shantou or brake system oil leakage similar, but it and the lack of oil, oil leakage and there is a difference, such as continuous re-step on the brake pedal, it has a very good braking effect. This kind of fault is quite dangerous, the reason is that every time the brake has to continuously step down the pedal several times, which will lead to excessive vacuum consumption, the phenomenon of no brake. Therefore, it must immediately start to eliminate, otherwise it is extremely detrimental to traffic safety. The main reason for this kind of fault is: (1) there is no regular inspection and adjustment of the brake system, resulting in brake shoe and brake drum clearance is too large.
(2) brake fluid is too dirty, dirty damage back oil valve sealing, mountain in the device's structure, the storage fluid part of the booster pump is limited, such as the gap between the shoe and drum is too large, there will be a foot brake can not make the shoe and brake drum contact, resulting in the phenomenon of several feet.
(3) according to the requirements, after the oil valve in the pipeline should maintain a certain residual pressure, in order to ensure that the next brake can play a timely role. If the dirt in the pipe is too much, will lead to the sealing of the return oil valve is damaged, resulting in the return oil is too much. The troubleshooting method is as follows:
(1) check and adjust the braking system according to the provisions. Commonly used inspection method is: the empty stroke of brake pedal should not
It is larger than 1/2 of the full travel. If it fails to meet this requirement, the clearance between brake drum and shoe shall be adjusted. The standard clearance shall be 0.3mm.
(2) such as too much dirt, should replace all brake fluid, brake fluid should be replaced before cleaning the whole car pipeline (with alcohol).
Brake drum into the gravel glume or rivet off, causing drum, piece surface grooves, poor contact, brake performance.
(3) brake shoe support pin sleeve hole wear, make shoe sink, clearance adjustment is difficult; Or brake shoe support adjustment CAM in
The corrosion inside the sleeve is stuck, which hinders the brake clearance adjustment and reduces the braking effect.
Brake drum bearing nut adjustment is too loose or too tight. If the vehicle is too loose, the vehicle will move and sway, and the contact between the friction disc and the brake drum is not good.
When the bearing is too tight, it will heat up, and the lubricating oil will become thin and drip onto the friction sheet, causing skidding and brake soft fatigue.
(5) the air compressor work is poor, so that the air pressure in the storage cylinder is insufficient, brake pipe leakage, brake valve and other places sealed loosely leakage; points
Pump leather bowl damaged; Air compressor string oil, so that a large number of oil, not into the brake pipeline, resulting in braking weakness.
6) brake pedal free travel is too large; Brake drum and disc gap adjustment is not comfortable, brake drum out of circle; Worm adjustment on brake arm
Improper, so that the brake pump push rod extends too much, compound brake valve balance spring retardation hair card, brake when the internal and external balance spring movement interference.