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