Great Wall service chassis and body Manual - part 51

SA-100

Suspension System and Vehicle Axle

 Rear Suspension (Leaf Spring Type)

Remark: Tightening U-shaped bolt to the degree that the

protruding lengths of all U-shaped bolts under the spring seat

are the same.

3.

Mount the rear vibration damper

(a)

Connect the vibration damper to the vehicle frame with

bolts and then tighten the bolts.

Tightening moment: (25

)N
m

(b) Connect the vibration damper to the sprint seat with bolts

and tighten these bolts.

Tightening moment: (25

)N
m

4.

Keep the suspension frame in stable status;

(a)

Mount on the wheel;

(b)

Remove the bracket, and make the vehicle bounce verti-

cally for several times so as conduce it in stable status.

5.

Tighten the front ear pin and rear ear pin;

Tighten the nuts of front ear pin;

Tightening moment: (90

 0)N
m

Tighten the nuts of rear ear pin;

Tightening moment: (90

 0)N
m

all lengths of bolts protruding are same

BR-1

Braking System

Notice .......................................................................... BR-2

Troubleshooting .......................................................... BR-2

Inspection and Adjustment .......................................... BR-5

Master Cylinder ........................................................... BR-8

Vacuum Booster .......................................................... BR-10

Front Brake ................................................................. BR-13

Dr

.......................................................................... BR-13

SF .......................................................................... BR-20

Rear Brake .................................................................. BR-26

Dr

.......................................................................... BR-26

SF .......................................................................... BR-34

Load sensing proportion valve .................................... BR-42

Page

BR

BR-2

Braking System

 Notice and Troubleshooting

Notice:

1.

Carefully change each part where necessary because any

mistake will affect the brake system properties, and will lead

accidents during driving. And the parts to be changed must

be the same in part number or equal in quality.

2.

Keep the parts and each position clean when repairing the

braking system.

Troubleshooting

Trouble

Causes

Inspection items

Lower or soft pedal

Abrasion of brake shoe

Abrasion of brake pad

Oil leakage of braking system

Master cylinder failure

Air in braking system

Wheel-brake cylinder failure

Failure in the automatic regulator of rear brake.

Change the brake shoe; Change the brake

pad;

Repair the oil leakage;

Change the master cylinder;

Drain out the air from braking system;

Change the wheel-brake cylinder;

Repair or change the regulator

Brake stagnant

Poor adjustment of parking brake;

The bracing wire of parking brake is seized;

Poor adjustment of vacuum booster pushrod)

Failure of the drag spring or the return spring

Pipe line blockage

Brake shoe breakage or deformation

Brake pad breakage or deformation

Seizing of the wheel-brake cylinder or the brake

caliper piston

Automatic regulator breakage

Master cylinder failure

Adjust the parking brake;

Make repairing according to real situation;

Adjust the drag rod;

Change the drag spring or the return spring

Make repairing according to real situation;

Change the brake shoe

Change the brake pad

Make repairing according to real situation;

Change the regulator

Change the master cylinder

Over large braking

distance

Unsuitable tire inflation

There is oil stain or lubricant on the brake shoe or

brake pad;

Brake shoe deforms, the brake liner is worn or polished;

Brake pad deforms or is worn or polished;

Brake drum or brake disc deforms

Drag spring or return spring has trouble

The wheel-brake cylinder has trouble

The inner piston of wheel-brake cylinder is seized;

The brake pad is seized;

Inflate the air to suitable pressure;

Change the brake shoe or the brake pad;

Change the brake shoe;

Change brake pad

Change the brake drum or the brake disc;

Change the spring;

Change the wheel-brake cylinder;

Change the wheel-brake cylinder

Change the brake pad

The brake pedal is hard

but doesn

t work;

There is oil stain or lubricant on the brake shoe or

brake pad;

The brake shoe deforms, brake liner is worn or

polished, or the brake wheel is worn;

The brake pad deforms, or is worn or polished;

The piston of wheel brake pump is seized;

The vacuum booster has trouble

The vacuum degree is unsuitable

The brake pipe line is blocked

Change the brake shoe brake pad;

Change the brake shoe

Change the brake pad;

Change the wheel-brake cylinder;

Change the vacuum booster;

Make repairing according to real situation;

Make repairing according to real situation;

BR-3

 Troubleshooting (continued)

Braking System

 Notice and Troubleshooting

Trouble

Causes

Inspection items

There is clatter noise when using

the brake

(Drum-type brake)

The brake shoe is seized on the flange of rear baffle;

The flange of rear baffle is worn;

The pressure spring of brake shoe is loose or missing;

The fixed bolts of brake bottom plate is loose;

(disc type brake)

The brake pad support plate is loose or missing

The mounting bolts are loose;

Add lubricant

Change the lubricating flange

Change

Tightening it

Change

Tightening it

There is hoarse noise or quack-

quack when using the brake

The brake shoe or brake pad is worn;

The brake caliper, the wheel or the rotator interferes each

other.

There is friction between the dust cover and brake disc,

the brake bottom plate and the brake drum;

The other braking part has trouble

There is friction between the tire and body

Change the part, and re-process

precisely the brake drum or

rotator if the abrasion is serious;

Make change according to real

situation;

repair or change

Make repairing according to

real situation;

Change

Check or maintain the part

T h e r e   i s   s u c h   n o i s e   a s

continuous screaming, quack-

quack, oscillating sound, etc.

Notice: the braking materials

may generate the natural noise

and heat during friction, and

thus emit the energy. Therefore,

i t   i s   n o r m a l   t o   h a v e   t h e

s c r e a m i n g   n o i s e .   T h e s e

phenomena will be more serious

under the condition of frigidity,

torridity, and over humidity,

s n o w i n g   a n d   m u d .   t h e

screaming noise occurring

occasionally will not lead the

fatal brake trouble nor reduce

the effective properties of the

brake.

The brake drum, brake liner, liner or brake pad is worn

or scraped

The brake liner or brake pad is dirty or with oil stain or

polished.

The brake liner or brake pad is improperly used.

The brake pedal or vacuum booster drag rod is unsuitably

adjusted.

(disc type brake)

The brake pad silent pad is loss or damaged;

The brake pad is worn to the degree that the abrasion-

indicating lamp of brake pad has friction with the rotator.

There is burr or rust on the brake caliper.

(Drum type brake)

The pressure spring of brake shoe is soft in rigidity, or is

damaged or unsuitable.

The pressure spring pin or spring of brake shoe is loose

or damaged;

There is crack on the brake bottom plate flange

Check, repair or change

Clean or change

Check or change

Check for adjustment

Change

Change

Clean or polish the burr

Check, repair or change

Check, repair or change

Check, repair or change