Great Wall service chassis and body Manual — part 58
BR-28
7.
Tear down the parking brake arm;
Tear down the split pin with pliers to take apart the parking
brake arm.
8.
Take apart the brake pipeline from the wheel pump;
Tear down the brake pipeline and block the oil pipe with a clean
cork.
9.
Tear down the wheel brake pump;
Tear down the two bolts and the wheel-brake cylinder.
10. Tear down the following bolts and wheel-brake
cylinder parts:
(a)
Two piston rod;
(b)
Two dust cover
(c)
Two pistons
(d)
Two piston rubber bows
(e)
Spring.
Braking System
Rear Brake (Dr)
BR-29
Check and Repair the Rear Brake Parts
1.
Check and test the disassembled parts;
Check the disassembled parts to see whether there is abrasion,
rust or damage.
2.
Measure the inner diameter of brake drum;
Standard inner diameter)
254.0mm
Mix inner diameter: 256.0mm
3.
Measure the thickness of brake shoe liner;
Standard thickness
5.0mm
Min thickness
1.0mm
In case the thickness of brake shoe liner is less than the min
thickness or there is uneven abrasion, change the liner.
Remark: if one of the brake shoes is needed to change, all of the
brake shoes are required to change so that the even braking
performance is maintained.
4.
Measure the brake liner and the brake drum to see
whether they contact closely;
If there is poor contact between the brake liner and the brake
drum, repair the brake shoe with the grinding devices, or
change the brake shoe cluster.
Braking System
Rear Brake (Dr)
BR-30
Assembly of Rear Brake
remark: assemble the parts according to the
direction in the drawing;
left wheel
right wheel
forward
1.
Assemble the wheel-brake cylinder:
(a)
Coat moderate lithium soap base glycol grease on the
piston cup;
(b)
Assemble the wheel-brake cylinder:
Mount the two piston cups on two piston;
Encase the spring and two pistons in the wheel cylinder
body and
Mount the two dust covers
Remark: Assembly shall be conducted correctly according to
the direction shown in the drawing.
2. Mount the wheel-brake cylinder:
(a)
Use two bolts to fix the wheel-brake cylinder on the rear
bottom plate.
Coat moderate sealing glue (Glue 704) on the position where
the wheel-brake cylinder connects with the bottom plate.
Fastening torque
(1620)Nm
(c) Connect the brake pipeline on the wheel-brake cylinder.
Fastening torque
18Nm
3.
Coat the following parts with moderate lubricant that
resistant high temperature (do not pollute the friction
plates);
(a)
The upper plain of the hex convex platform where the
bottom plate connects the brake shoe;
(b)
Contact face of the brake shoe and the top lever of wheel
cylinder;
(c)
Contact face of the brake shoe with the support pin.
Braking System
Rear Brake (DR)
Assembly of Rear Brake
forward
BR-31
(d)
Adjusting bolts
(e)
Contact position where the clearance adjuster and the
brake shoe.
4.
Mount the parking brake drag arm;
Mount the new split pin with pliers to mount the parking brake
drag arm.
5.
Mount the rear brake shoe:
(a)
Mount the parking brake bracing wire on the parking
brake drag arm.
(b)
Mount the rear brake shoe in such way that its end is
inserted into the cylinder rod. Encase the pressure spring
drag rod in the brake bottom plate and the brake shoe
assembly in turn and then insert it in the pressure seat ,
pressure spring, pressure spring seat, finally rotate the
pressure spring in place with the pressure spring fork.
6.
Mount the parking brake pull plate and the front brake shoe:
(a)
Mount the pull plate and the spring.
(b)
Mount the front brake shoe, of which, the end is inserted
in the piston rod, and mount the pull plate. Insert the
pressure spring drag rod in the brake bottom plate and
brake shoe assembly in turn, then encase it in the pressure
spring seat, pressure spring and pressure spring, finally
rotate the pressure spring in place with the pressure
spring.
7.
Mount the tension spring;
Mount the tension spring with pliers.
Braking System
Rear Brake (DR)
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