| Brake hair bite phenomenon: lift the brake pedal, the brake valve exhaust is slow or does not exhaust, not the immediate lifting of the brake, or exhaust, although fast, but there is still a braking effect, causing traffic difficulties or unable to start car .
The original vehicle:
1 without the brake pedal free travel.
(2) brake pads to adjust the exhaust valve too thin, the return spring is too soft, broken or swollen rubber seat aging.
3 brake valve tappet corrosion.
4 brake pedal to the brake position between the transmission arm parts card.
5 brake camshaft bracket bushing with corrosion card.
6 and friction brake drum shoe clearance is too small.
7 brake shoe anchor pin return spring rust dirt or too soft, broken.
8 axle tube with rear axle or wheel bearing wear caused by loose with the Department.
9 brake chamber diaphragm deformation aging, single-layer film or a brake hose rupture muster aging airflow. Diagnosis: Lift the exhaust brake when the brake pedal is slow or does not exhaust, mostly brake failure, the performance of the wheel brake drums are hot.
If the exhaust sound scared or made to exhaust and brake bite, usually made of individual wheel braking bite, try the wheels touch the brake drum temperature the higher is the faulty wheel.
1 to determine if the brake is faulty, you should first check the brake pedal free travel. If free travel is too small or not, should be adjusted. If free travel is normal, can loosen the exhaust valve test. For better, for the exhaust valve shims too thin. Still no improvement, you can check the exhaust valve return spring and plastic seats were above normal, you should check whether the brake lifter rust dirt and brake rods are active and flexible delivery.
(2) individual round hair bite, you can lift the brake pedal, the brake chamber observed putting the case back to the place. If the back bit back bit slow or not, should check the brake camshaft bracket set has lost its lubrication or a different axis through the large card. If properly set up the wheel check the gap, and the space, changing the wheels fall, the Department of wheel or axle bearing Songkuang casing and rear axle with the loose. If the gap is normal, can check the brake chamber diaphragm and the return spring is a problem.
Automotive air brake system fault diagnosis
First, the brake not working or failure phenomena: braking, the braking effect of the wheel well or can not afford a braking effect.
Reasons: 1. Air Compressor bad, leaving the air pressure within the pump reservoir low or no gas. Air compressor belt may be too loose or broken exhaust valve leakage air compressor, air compressor exhaust valve spring is too soft or broken piston or piston ring leak.
2 tracheal rupture or loose fittings.
3 brake or brake chamber diaphragm membrane rupture.
4 brake pedal free travel is too large.
5 brake arm worm adjusted properly, the brake chamber putting out too much.
6 friction plates and brake drum friction plate clearance is too large or there is oil.
Diagnosis and exclusion:
1, such as pressure gauge indicates the number of 0 to depress the brake pedal, put the gas loose from time to time if the sound is clear barometer is faulty, replace the barometer. If there is no sound deflated, check the air compressor belt and stored by the air compressor to pump a case of the trachea.
(2) Following the above checks, in good condition, such as the barometer indicates the number is low, the fault in the air compressor, exhaust valve or cylinder should be checked within the state of technology, to be repaired.
3, such as barometer indicates pressure values up to standard, can depress the pedal, the brake valve to check whether the leak between the wheels of the Department. If there is no leakage at, check and adjust brake pedal free travel shoe lining and brake drum clearance. |
