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Air brake system brake drag phenomenon causes and troubleshooting

Apr,21,2022 << Return list

Air brake system brake drag phenomenon causes and troubleshooting

(1) Braking drag of the air brake system

① The car is difficult to start and cannot drive;
 ②After the car runs for a certain mileage, the brake drum heats up and the sliding distance is shortened.
 ③ Other reasons, such as loose hub bearing, loose axle casing, etc.

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(2) Causes of brake drag of the air brake system

①The brake pedal has no free travel;
 ②The brake lever is issued or the return spring is too soft, so that the brake pedal cannot be returned;
 ③ The opening of the exhaust valve in the brake regulating valve is too small, or its return spring is too soft, disassembled or the rubber valve seat is aging and swelled;
 ④ The brake air chamber diaphragm (piston) return spring is fatigued, broken or the elasticity is too small;
 ⑤ The brake camshaft is short of oil, corroded or stuck in its bearing hole;
 ⑥ The brake shoe and the support pin are corroded or the return spring is too soft or broken;
 ⑦ Improper adjustment of the brake clearance, after the brake is released, the brake shoe friction plate and the brake drum still partially rub;

(3) Diagnosis and elimination of brake drag of air brake system

The vehicle is first road tested, and the brakes are intentionally applied during the road test. After driving for a certain distance, stop the vehicle to check the temperature of each wheel brake drum.
 ①If it is found that the brake drum is hot, and the brake regulating valve exhausts slowly or does not exhaust when the brake pedal is lifted, it is mostly the fault of the brake regulating valve and the brake operating mechanism.
 a. Depress and lift the brake pedal and observe the return of the brake pedal. If the brake pedal cannot be completely returned, it means that the brake lever is issued or the pedal shaft is poorly lubricated, and it should be repaired or lubricated; b. Check the brake Whether the free stroke of the pedal meets the requirements, if the free stroke is too small, it means that the opening of the exhaust valve of the brake regulating valve is too small and should be adjusted;

b. Check whether the free travel of the brake pedal meets the requirements. If the free travel is too small, it means that the opening of the exhaust valve of the brake regulating valve is too small and should be adjusted; c. Depress the brake pedal and lift it up quickly, check the system Exhaust sound from the control valve. If braking

③ If the above inspections are normal, the wheel brakes should be removed for further inspection.

Remove the brake drum of the wheel brake and check the return of the brake shoes. If the brake shoe returns slowly or does not return, check whether the spring force of the brake shoe return spring is weakened, whether the lubrication between the brake shoe and the support pin is poor, and whether the brake camshaft is poorly lubricated. If so, it should be replaced or lubricated.

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