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Why is the brake still engaged when the air brake is released?

2 Answers

HavenDella

07/24/25 9:06am

This situation is caused by the one-way check valve of the brake vacuum pump being stuck. The only solution is to replace the check valve assembly to eliminate the fault. If it's a drum brake, take it to a repair shop and disassemble it to check if the brake pads are worn.

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StVanessa

08/11/25 4:33am

I've been driving large trucks for many years and have encountered several situations where the parking brake remained engaged after releasing the air brake. Last time on the highway, after releasing the brake, the truck just wouldn't move, making me break out in a cold sweat from anxiety. Later, I found a place to stop and checked the air pressure gauge, only to discover insufficient air pressure due to an aging air line that was leaking. Luckily, I got it repaired in time to avoid an accident. It's important to develop the habit of checking the air pressure before driving, listening for any air leaks while operating the vehicle, and performing regular maintenance on the air brake system, especially the air lines and connectors. Remember, the air brake system relies on air pressure to release the brakes. If the pressure is too low or there's a leak, even the best truck can easily have unintended braking. Don't let it compromise driving safety. Although this issue might seem minor, don't overlook it. If an accident happens, regret will come too late.

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