| 摘要 |
The system comprises a brake cylinder with incorporated spring brake (1) , associated with each wheel of at least one axle of the vehicle and having a first and a second inlet for pressurized air (1a, 1b) , to actuate pneumatic braking when both inlets (1a, 1b) are under pressure, spring braking when the second inlet (1b) is discharged, and the release of spring braking when the second inlet (1b) is supplied once more with pressurized air; a valve (6) for controlling the braking of a trailer; a parking and emergency braking manual control valve (4) , a service braking control pedal valve (3) ; and a control valve unit (7) including a relay valve (8; 108) .
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