Which pipe should be blocked when the brake cylinder is leaking air?

[McGabriel]

Blocking the intake pipe will stop the leakage, but without air intake, the brakes will fully lock up and the vehicle won't be able to move. You can locate the leaking brake cylinder's intake pipe, cut and block it, then use a wrench to remove the screw at the back of the brake cylinder to release the air brake. The other wheels can still operate and brake normally! A faulty car brake cylinder can result in poor braking performance or the tires "locking up," causing the brake discs to overheat. In severe cases, it may lead to tire explosion and unsafe driving conditions. In such situations, it's necessary to promptly replace a new brake cylinder rubber cup.