What is the solution for slow air brake return?
3 Answers
The solutions for slow air brake return are: 1. There is a nut and screw on the sub-pump. Normally, the screw is retracted inside, and you can use a wrench to tighten the nut; 2. If the rear brake pump and electronic handbrake are integrated, this situation may occur if the handbrake motor is faulty. Stepping on the brake causes the motor to vibrate and work, indicating that the motor is stuck or the plug wiring has poor contact; 3. You can go to a 4S shop and have professional automotive repair personnel inspect and repair it. The air brake method is mostly used in the handbrake systems of medium and large-sized vehicles. The handbrake system of such vehicles usually uses a strong spring to maintain a constant braking state. When the vehicle is to be driven, the driver releasing the handbrake is an inflation action. A certain air pressure must be reached to push open the spring, that is, to release the handbrake, before the vehicle can be driven.
I've driven many long-distance trips and encountered several instances where the spring brake was slow to release. This is usually due to issues in the air system, such as insufficient compressed air or a clogged valve. A slow release is quite dangerous because when you press the brake and then release it, if the brake disc doesn't return to its proper position, it may fail during the next braking attempt. I would first check the air pressure in the air tank—if it's below the normal operating range, it might need refilling. Then, I'd inspect the air lines for leaks by simply feeling around the connections for any escaping air. If there's a leak, it should be fixed immediately. If that doesn't solve the issue, the dryer might be clogged. Dust buildup can obstruct airflow, so removing and cleaning it thoroughly should help. Another common culprit is a fatigued return spring. Try applying some lubricant first; if that doesn't work, replace it. I've driven in snowy conditions where a slow release is even more dangerous, so don't delay—handle minor issues yourself and take more complex problems to a reliable repair shop. In any case, timely action can save a lot of trouble—safety comes first.
Slow retraction is really nerve-wracking. I have OCD and believe brakes must be responsive. If the air brake doesn't retract fully, braking becomes sluggish while driving, especially dangerous during downhill or sharp turns. The solution is simple: first check the entire air system to see if the pressure is sufficient—if not, replenish air and let the engine run for a few minutes before testing again. Then check for air leaks; if there's a hissing sound at pipe joints or valves, don't drive—temporarily seal with tape and drive to a repair shop. Spring issues are also common; gently push to see if it retracts quickly—if slow, apply some lubricant. I once experienced slow retraction on the highway and nearly had an accident. Since then, I've made it a habit to clean the air filter every quarter. Remember, the sooner you address this, the better—don't skimp on inspection time.
