Structure and Operation
D760.H03E-001.H1907 73
Method for Releasing Spring Brake
Please refer to the specific configurations of your vehicle.
Where the vehicle cannot be released from parking brake and cannot start, it
may be caused by the pressure drop of spring brake air chamber, which makes the
spring brake operate automatically. In such case, check the pipeline system or valves
for air leakage first; and timely eliminate the leakage, if any. If the elimination is not
possible, please contact a Technical Service Center (Station) authorized by DONG-
FENG COMMERCIAL VEHICLE CO.,LTD..
Methods to release dual diaphragm type spring brake air chamber
1. Remove release screw from the bracket,
open the rubber dust cap at the rear part of
air chamber, insert the hook end of release
screw into air chamber spring cavity and
rotate to a degree, and confirm the tray is
hooked;
2. Install washer and nut, rotate the nut with
hand, and rotate the nut till the screw is out
by about 40mm with a wrench. The spring
braking is then released.
WARNING:
1.Manual release of parking brake of spring brake air chamber is limited
to emergency only. Running the vehicle without parking brake is quite
dangerous and may result in injury.
2.Ensure that the vehicle will not slide automatically before taking the
above steps! The vehicle will lose parking braking function
temporarily after the above steps are taken!
3.Afterwards you must find out the reason for insufficient spring brake
air pressure for prompt repair. After troubleshooting, be sure to
remove the release screw from air chamber spring cavity to restore
the parking braking function. And refit the release screw to the bracket
and tighten it for next use.
Piston type spring brake air chamber
1. Manual bolt
2. Nut
3. Washer
4. Dustproof plug
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