When the hand brake valve set "parking brake" position, the hand brake valve continued to leak from the exhaust port, generally speaking, is the valve closed intake valve and valve seat is not tight, or between the valve and valve seat has a foreign body, or damage caused by intake valve seals. With a repair kit to replace the intake valve seals can be solved.
When the parking brake, hand brake valve leakage does not produce other fault. However, when the hand brake handle " drive" position, the hand brake valve leakage, will produce cars ( in ) rear wheel " pa tight ' ' fault. This usually is due to hand brake valve stem and valve contact closure caused by lax. Obviously caused the exhaust port closure may be due to lax seal damage, or due to valve stem 7 and 10 are separated between the foreign body or oil caused by the exhaust port closed. Disassembling and cleaning or replacing the intake valve seals, failure can be ruled out.
The hand brake pneumatic cylinder too long
Before starting the car, the first main brake cylinder should be sufficient air pressure. Warning lights, buzzer stops known that the main brake ( front brake cylinder and ( in ) rear brake pump ) has sufficient pressure, this time if the hand brake release to " drive" position, the hand brake low pressure warning light, the hand brake cylinder pressure is insufficient, the spring brake chamber is not completely brake release. So when the car forced off, ( in ) after the bridge will produce braking " pa tight " phenomenon. So take a warning light goes out can only start after the car.
Under normal circumstances, the main brake cylinder after sufficient gas ( the main brake low pressure warning light goes out ), a hand brake cylinder sufficient, ( hand brake low pressure warning lights ). If the inflation time is too long ( hand brake low pressure warning lamp delay off ), then across the ( in ) the rear brake circuit and the gate valve between the hand brake circuit ( or relief valve ) a problem. Valve is a one-way valve, when the ( in ) the rear brake circuit pressure up to 6.5 bar to open when the valve should be quick to hand brake pneumatic circuit. If the pressure is adjusted too high to be stuck (or frozen ) does not open, will result in long hand brake pneumatic circuit failure. Check and adjust the valve can be troubleshooting.
Spring energy storage compartment leak
Spring energy storage chamber piston seal damage, injury, chamber cylinder strain and so on, will cause the sub-room leak. Because of ( in ) after each axle wheel brake spring energy storage chamber are pneumatic Unicom, so long as there is a sub-room leak, it will cause a pressure drop in the bottom of each compartment, it leads to a moving ( in ) rear wheel " pa tight" result. In such failures, you need to leak off the brake compartment maintenance. Removing and installing the spring brake chamber must be carried out in the press, to ensure the safety of.
Hand brake valve leakage relay
When the car in the parking brake condition, the following action valve leak, the car will not cause trouble, which is obviously brake valve of the intake valve seal damage or foreign matter or impurities between the valve and valve seat, the valve closed lax. In this paper.
When the car is in running state, the relay valve continued to leak from the exhaust port, exhaust valve and piston apparently not tightly closed, at this time will spring brake energy storage sub-chamber pressure is insufficient, fault resulting in brake "pa tight. ".
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