Great Wall service chassis and body Manual - part 57

BR-24

2.

Measure the thickness of brake disc;

Standard thickness

20.0mm

Min thickness

18.0mm

If the brake pad is scraped, repair it; where the abrasion is

serious and its thickness is smaller than the min thickness,

change the brake disc.

3.

Measure the bounding value of the brake disc face;

Remark: the bearing is required to be verified in the suitable

adjustment before measuring.

Max face bouncing value: 0.11mm;

4.

Change the brake disc according to the requirement:

(a)

Tear down the hub and the brake disc. (see the paragraph

of front wheel hub)

(b)

Mount the new brake disc and screw up the connecting

bolts as the specified torque.

(c)

Mount the hub and brake disc assembly. (see the para-

graph of front wheel hub).

Fastening torque

(75 
 5)N
m

(d)

Mount the caliper bracket on the steering knuckle and

screw up the bolts according to the specified torque.

Fastening torque

123N
m.

Assembly of Brake-wheel pump

1.

Preparation

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

materials, and coat moderate rubber lubricant on the work

faces of piston, piston dust cover and rectangular sealing ring.

2.

Encase the piston sealing ring in the caliper body

Braking System

 Front Brake(SF)

BR-25

3.

Encase the piston in the caliper body.

4.

Encase the piston dust cover, dust cover steel-

gripping hoop in the caliper body.

Mount of Brake Calipers

1.

Mount the brake caliper and screw up the two

mounting bolts.

Fastening torque

123N
m

2.

Mount the brake pads;

3.

Connecting the brake pipeline;

Use the open spanner to connect the pipeline.

Fastening torque

(21 
 1)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: avoid the brake liquid of spraying on the brake disc

when exhausting the air.

5.

Check to see whether there is leakage of brake liquid.

Braking System

 Front Brake(SF)

BR-26

Rear brake

Element figure

wheel-brake cylinder cluster

pressure spring drag rod

self clearance-

adjusting bracing

wire

parking brake arm

flat washer

 split pin

brake shoe gear

return spring

parking brake push plate

push-plate spring

b a c k   b r a k e

shoe

s e l f   c l e a r a n c e -

adjusting toggle

tension spring

brake drum

clearance adjuster

pressure spring seat

pressure spring

front brake shoe

Disassembly of Rear drum-type Brake

Remark: if the braking torque of manual brake cannot satisfies

the braking requirement, it is suggested to check the thickness

of brake shoe liner, where the thickness is less than the min

thickness, change the brake shoe.

Min thickness

1.0mm

1.

Tear down the rear wheel;

2.

Tear down the brake drum;

Remark: in case the brake drum is not easy to tear down, the

following steps shall be adapted:

(a)

Tear down the clearance-adjusting hole; insert a screw-

driver in the brake bottom plate hole to prize up the

adjusting bolt inner tilt angle with the self-adjusting fork.

(b)

Use another screwdriver to adjust the adjusting bolt inner

tilt angle to loosen the clearance adjuster of brake shoe.

Dr

Braking System

 Rear Brake (Dr)

 Parts that cannot be reused after being used

BR-27

3.

Tear down the return springs of the two brake

shoes.

4.

Tear down the self-adjusting bracing wire, brake shoe

retainer ring, bracing wire guide seat and the self-

clearance adjusting toggle plate.

(a)

Press and push the self clearance-adjusting toggle plate to

teardown the bracing wire of self clearance-adjuster,

brake shoe retainer ring and bracing wire guide seat.

(b)

Take out the spring from the self clearance-adjusting

toggle plate to tear down the clearance-adjusting toggle

plate and the spring.

5.

Tear down the tension spring;

Tear down the tension spring with the pliers.

6.

Tear down the brake shoe, clearance adjuster and

parking brake push plate.

(a)

Tear down the pressure spring seat, pressure spring and

pressure spring drag rod.

(b)

Tear down the brake shoe, clearance adjuster and parking

brake push plate.

(c)

Tear down the bracing wire from the parking brake.

Braking System

 Rear Brake (Dr)