1, the hand brake valve leakage

When the hand brake valve set "parking brake" position, the hand brake valvecontinued to leak from the exhaust port, generally speaking is the intake valve and valve seat valve closure lax, or between the valve and valve seat, there are foreign bodies or the intake valve seals damage caused by. Solve the repair kit to replace the intake valve seals can be.

When the parking brake, hand brake valve leakage will not produce other fault.However, when the hand brake lever set "drive" position, the hand brake valve leakage, will be generated when the automobile runs (in) rear wheel "pa tight '' fault.Cairo solar term door body said this usually is due to hand brake valve stem andvalve contact closure caused by lax. Apparently 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 lax. Disassembling and cleaning or replacing the intake valve seals, failure can be ruled out.

2, the hand brake pneumatic cylinder too long

Before starting the car, the first main brake cylinder should be sufficient air pressure.Warning light is off, the buzzer stops known that the main brake (front brake cylinder and (in) the rear brake pump) has sufficient pressure, this time if the hand brake release to "drive" position, the hand brake low pressure warning lamp lit, it indicateslack of hand brake cylinder pressure, the spring brake chamber is not completely the 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.

Cairo solar term door body said that under normal circumstances, after the mainbrake cylinder sufficient gas (main brake low pressure warning light goes out), a hand brake cylinder is enough, (hand brake low pressure warning light goes out). If the inflation time is too long (hand brake low pressure warning lamp delay off), then across the (in) between the rear brake circuit and the hand brake circuit valve (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. Dismantle and check and adjust the valve can be troubleshooting.

3, spring energy storage sub room leak

Spring energy storage chamber piston ring damage, strain, strain and other sub chamber cylinder, will cause the sub room leak. Because of (in) after each springreservoir bridge wheel can brake chamber are pneumatic Unicom solar term door body, Carol said as long as there is a sub room leak, it will cause a pressure drop in various sub chamber end, 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, in order to ensure the safety of.