Great Wall service chassis and body Manual - part 55

BR-16

10. Mount the front wheel;

Screw up the fixing nut of wheel.

Fastening torque

(135
150)N
m

Disassembly of Wheel-brake Cylinder

1.

Take apart the brake pipeline.

(a)

Tear down the brake pipeline. And block the outlet with

a clean cork.

(b)

Tear down the brake oil pipe bracket from the wheel-

brake cylinder.

2.

Tear down the wheel-brake cylinder from the caliper

bracket.

Tear down the two hex bolts and the wheel-brake cylinder.

3.

Tear down the brake pad:

(a)

Two brake pad;

(b)

Two silent pad cluster;

(c)

Four brake pad lock plate.

Pump Disassembly of Wheel brake

1.

Take apart the following parts:

(a) Two sliding sleeve;

(b) Four sliding sleeve dust cover;

(c) Two sliding liner.

Braking System

 Front Brake (Dr)

BR-17

2.

Tear down the piston dust cover snapping ring and the

piston dust cover;

Tear down the piston dust cover snapping ring and the piston

dust cover with screwdriver.

3.

Tear down the piston from the wheel-brake cylinder:

(a)

Put a wooden plate between the piston and the caliper

body.

(b)

Tear down the piston from wheel-brake cylinder with the

compressed air.

Warning: Do not put your finger in front of the piston when

using the compressed air.

4.

Tear down the piston sealing ring from the caliper body.

Tear down the piston sealing ring with bent needle.

Notice: the tools used shall not be sharp so as not to

scrape the piston sealing ring.

Check the front brake parts

1.

Measure the thickness of brake pad liner;

Standard thickness

10.0mm

Min thickness

2.0mm

If the thickness is less than the min thickness or is unevenly

worn; change the brake pad.

2.

Measure thickness of brake disc

Standard thickness

25.0mm

Min thickness

23.0mm

If the brake disc is scraped, repair it, if the brake is serious

worn to the degree that its thickness is less than the min thickness,

brake disc requires to be changed

Braking System

 Front Brake (Dr)

BR-18

3.

Measure the bouncing value of the brake disc face;

Remark: verify the bearing is aligned correctly before

measuring.

The bouncing value of max face: 0.11mm

4.

Change the brake disc according to the requirements

(a)

Tear down the calipers body from the steering knuckle.

(b)

Tear down the hub and the brake disc (See Page SA-11).

(c)

Mount the new brake disc and screw up the connecting

bolts according to the specified torque.

Fastening torque

(60
79)N.m

(d)

Mount the hub and brake disc assembly (see page SA-12);

(e)

Mount the caliper bracket on the steering knuckle and

screw up the bolts according to the specified torque.

Fastening torque

(85
105)N.m

Cylinder Assembly of Wheel-brake

1.

Preparation

All parts shall be washed, dried and cleared away the alien

materials before the assembly. And coat moderate vacuum

silicon base grease on the work faces of sliding sleeve dust

cover, sliding sleeve and the sliding liner; and plaster the

moderate rubber lubricant on the work faces of piston, piston

dust cover and the rectangular sealing ring.

2.

Encase the piston sealing ring and piston in the caliper body;

(a)

Screw the vent screw in the vent hole of calipers.

Fastening torque

(8
13)N.m

(b)

Coat moderate rubber lubricant on the work face rectan-

gular sealing ring and encase the caliper body in groove.

(c)

Encase the piston in the caliper body.

3.

Encase the piston dust cover and the dust cover

snapping ring in the wheel-brake cylinder.

Braking System

 Front Brake (Dr)

BR-19

4.

Mount the sliding liner, sliding sleeve dust cover and

sliding sleeve.

(a)

Encase the sliding liner and sliding sleeve dust cover in

the wheel-brake cylinder.

(b)

Ensure the sliding sleeve dust cover in the ring groove of

wheel-brake cylinder hard.

(c)

Encase the sliding sleeve in the sliding sleeve dust cover.

(d)

Ensure the sliding sleeve dust cover in the ring groove of

sliding sleeve.

Mount of Brake Calipers

1.

Mount the brake pad;

2.

Mount the wheel-brake cylinder:

(a) Mount the wheel-brake cylinder;

(b) Mount and tighten the two assembling bolts (the bolts

shall be coated with the thread locking sealing agent).

Fastening torque

(38
50)N.m

3.

Connect the brake pipeline.

Connect the brake pipeline with the calipers.

Fastening torque

(21 
 2)N.m

4.

Observe the height of brake liquid level and, if

necessary, add in the brake liquid and exhaust the air

in braking system.

Notice: prevent the brake liquid from spraying on the

brake disc when exhausting air.

5.

Check to see whether there is leakage of brake liquid.

Braking System

 Front Brake (Dr)