Great Wall service chassis and body Manual — part 56
BR-20
Front Brake
Element figure
spring gasket12
123
separation pads
silent pad
brake pad
brake caliper
brake pad snapping ring
guide pin lock spring
sealing ring
guide pin
dust cover steel gripping hoop
piston dust cover
piston
brake disc
: fastening torque
N
M
Change of Brake pad
Remark: In case there is a continuous screaming from the front
wheel when braking the vehicle during driving, check the
alarm pad for friction limit for brake pad. If there is friction
trace on the alarm pad with the brake disc, change the brake pad
1.
Disassemble the front wheel;
2.
Check the thickness of friction material of brake pad.
Check the thickness of friction material of brake pad, if it fails
to be within the specified range, change the brake pad.
Min thickness
2.0mm
SF
Braking System
Front Brake(SF)
BR-21
3.
Disassemble the following parts:
(a)
Guide pin snapping spring;
(b)
Two guide pins;
(c)
Brake pad snapping ring
(d)
Two brake pads;
(e)
Two silent pads; and
(f)
Two separation pads
4.
Measure the thickness of brake disc.
(See BR-24)
5.
Measure the radial swinging of the brake disc.
(see page BR-24)
6.
Mount on the new brake pad;
(a)
Draw out a little brake liquid from the liquid container.
(b)
Press in the piston with the hammer lever and similar tool.
Remark: Only one brake pad of the same wheel can be changed
in one time so as to prevent the piston on the other face ejecting
out.
(c)
Mount two silent pads and two separation pads on the
new brake pad.
Remark: coat the brake oil for disc on the inner silent
pads.
(d)
Mount the brake pad with the worn limit alarm pad on the
inner side, while the other brake pad on the outer side.
Note: Pollution of oil stain or coat is not allowed on the
work faces of brake pad or brake disc.
7.
Mount the brake pad snapping spring;
Brake pad snapping spring shall be mounted at the lower
position;
Braking System
Front Brake(SF)
BR-22
8.
Mount the two guide pins;
9.
Mount the guide pin snapping spring
Disassembly of Wheel brake Pump
1.
Disassemble the front wheel;í
2.
Disassemble the brake pipeline;
Tear down the brake pipeline with a container containing the
brake liquid.
3.
Disassemble the wheel-brake cylinder.
Tear down the two hex bolts and the wheel-brake cylinder.
4.
Disassemble the following parts:
(a)
Guide pin snapping spring;
(b)
Two guide pins;í
(c)
Brake pad snapping spring;
(d)
Two brake pads;
(e)
Two silent pads and
(f)
Two separation pads.
Braking System
Front Brake(SF)
BR-23
Wheel-brake cylinder disassembly:
1.
Tear down the dust cover steel gripping hoop and the
dust cover.
Tear down the dust cover steel gripping hoops and piston dust
covers of the four wheel-brake cylinders with the screwdriver.
2.
Tear down the piston from the wheel-brake cylinder:
(a)
Prepare a wooden block with the dimensions as shown in
the drawing (which is used to support the piston)
(b)
Put the wooden block between the pistons and insert one
brake pad on one side of the wooden block.
(c)
Tear down the four pistons from the wheel-brake cylin-
der by using the compressed air.
Warning: do not put your fingers in front of the piston
when using the compressed air.
3.
Tear down the piston sealing ring.
Tear down the four piston sealing ring from the wheel-brake
cylinder with the screwdriver.
Check the front brake parts
1. Measure the thickness of brake pad liner;
Standard thickness
9.0mm
Min thickness
2.0mm
In case the liner is less than the min thickness or the liner is
worn unevenly, change the brake pad.
Braking System
Front Brake(SF)
mm
mm
mm
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