Great Wall Hover. Manual — part 70

Brake-1

Chapter 8

Brake

Cautions. . . . . . . . . . . . . . . . . . . . . .. 2

Troubleshooting. . . . . . . . . . . . . . . . . . . 2

Check and adjustment. . . . . . . . . . . . . . . . ..5

Brake pedal. . . . . . . . . . . . . . . . . . . . ..7

Parking brake. . . . . . . . . . . . . . . . . . . ...8

Front brake. . . . . . . . . . . . . . . . . . . . ...9

Rear brake. . . . . . . . . . . . . . . . . . . . ...16

Rear parking brake. . . . . . . . . . . . . . . . . ..22

Sensor load proportional valve. . . . . . . . . . . . . .29

Antilock Braking System (ABS). . . . . . . . . . . . ..31

Brake-2

Troubleshooting

Cautions

Failure cause

Inspection

content

Pedal is low or soft

brake pad is worn

brake block is worn

brake system is leaked

master pump has failure

Brake system has air

Brake pump has failure

Auto adjuster of rear brake has failure

Replace the brake shoe

Replace the brake block

Repair the leakage

Repair or replace the master pump

Drain the air from brake system

Replace the brake pump

Repair or replace the adjuster

Lag of brake

Parking brake is adjusted badly.

Pull wire of parking brake is locked

Assist push rod is adjust badly

Extension spring or return spring has fault

Pipeline is blocked

brake pad is broken or deformed

brake block is broken or deformed

Auto adjuster is damaged

Master pump has failure.

Adjust the parking brake

Repair if necessary

Adjust the push rod

Replace the extension spring

Repair if necessary

Replace the brake shoe

Replace the brake block

Replace the adjuster

Replace the master pump

Brake is stagnant

Improper inflation of tyre

There is grease spot or lubricant oil on the

brake shoe or brake block.

The brake shoe is deformed ; the brake pad

is worn or smoothed

The brake block is deformed, worn or

smoothed

The brake drum or brake disc is deformed

Extension spring or return spring has failure

Wheel pump has failure

Pump has failure

Brake block is blocked

Charge the tyre to the proper pressure.

Find out the cause. Replace the brake shoe or block.

Replace the brake shoe

Replace the brake block

Replace the brake drum or brake disc

Replace the spring

Repair the wheel pump

Replace

Replace the brake block

brake pedal is hard

There is the grease spot or lubrication oil on

the brake disc or brake block.

The brake shoe is deformed; the brake pad is

worn or smoothed

The brake block is deformed, worn or

smoothed

Brake pump has failure.

Brake assist has failure

Improper vacuum degree

The brake pipeline is blocked.

Find out the cause .

Replace the brake shoe or brake block

Replace the brake block

Replace

Replace the assist

Repair if necessary

Repair if necessary

Brake-3

Troubleshooting (continued)

failure cause

Inspection

content

The brake generates the

crack clatter during

operation.

(drum brake)

The brake shoe is blocked in the rear apron flange

The rear apron flange is worn

The brake shoe pull-out piece spring is loose or lost

The fixed bolt of rear apron is loose (disc brake )

Brake block support plate is loose or lost

Installation bolt is loose

Filled with lubricated oil

Replace the lubricant flange

Replace

tighten

replace

tighten

It has the rustle or rattler

when use the brake

The brake shoe gasket or brake block is worn

The brake caliper and wheel or rotor are disturbed

mutually

The dustproof cover and rotor, rear apron and brake

drum are disturbed mutually

Failure of other brake system component

Tyre generates the abrasion with the tyre and chassis

Replace, if the scratch is heavy,

then fine machine the brake drum or

rotor again

Replace it according to requirement

Correct or replace

Repair or replace it according to

requirement

Check or maintain

It has the squeak, continuous

scream, rattler or vibration

noise when use the brake .

Caution: The abrasion

material in the brake will

generate the inherent noise

and heat during the

abrasion, then emit the

heat. So it is normal that

generate the squeak by

accident. The condition

will be serious in extreme

environment, such as cold,

hot, high humidity,

snowing, saliferous and

mud. The accident squeak

will not cause the fatal

failure of the brake, and

will not reduce the effective

performance of the brake.

The brake drum and brake shoe gasket, rotor and

brake block is worn or scratched.

The brake pad or block is dirty, with oil or smoothed.

The brake pedal or assistor push bar is adjusted

incorrectly

(disc brake )

The brake block silencing plate is lost or damaged.

The abrasion of the brake block makes the brake

block abrasion indication plate contacts the rotor

The brake caliper has burr or is corrosive

(drum brake)

The pull-out piece spring of brake shoe is soft,

damaged or improper. The pull-out piece spring pin

and spring of brake shoe is loose or damaged; and

rear apron flange has crack

Check, repair or replace

clean or replace

check, replace

check and adjust

replace

replace

clean or remove the flash

check, repair or replace

Brake-4

failure cause Inspection

content

It has the continuous

scream and squeak

when does not use the

brake

The brake pedal or assist push bar is adjusted

incorrectly

The return of brake assist or master pump or wheel

pump is bad

(disc brake )

The piston is corrosive or blocked

The brake block in brake caliper is in improper

position

Shell abrasion of rotor and brake caliper

The brake block support plate in disc brake is

installed improperly

The brake block abrasion indication plate contacts

the rotor for the abrasion of brake block

(drum brake)

The press spring of brake shoe is soft, damaged or

improper.

The flange of rear back rear apron is cracked

The rear apron interfere with the brake drum

mutually after bent or warp

Improper machining of brake drum, cause the mutual

interference of rear apron and brake shoe

components of other brake system:

Brake system has loose or redundant components

The brake pad is smoothed for the rear brake drum is

adjusted too tight

The wheel bearing is worn damaged or under

lubricated

Check and adjust

Check, repair or replace

Check and fill with lubrication oil if

necessary.

Repair or replacement

Repair or replacement

Repair or replacement

Repair

Repair

Repair or replacement

Repair or replacement

Replace the brake drum

Check, maintain and replace if

necessary.

It still has the rattler,

click or cackle noise

when does not use the

brake.

The stone or foreign enters into the inside of wheel

protecting hood

The hub nut is loose

The brake pedal or assistor push bar is adjusted

improperly

The wheel bearing is worn, damaged or lubricated

insufficiently

(disc brake )

The muffler spring is soft or lost; the brake block

support plate or external end of brake block is coiled

silencing plate is unsound

The slide bush is worn

The installation bolt is loose

Piston returns unsoundly

(drum brake)

Have loose or redundant component

Remove the foreign materials such as

the stone

Tighten it to the specified torque, it

should be replaced if the bolt hole is

enlarged

Check and adjust

Check, lubricate or replace

Repair or replacement

Check and replace if necessary

Check and replace if necessary

Check and tighten if necessary

Check , repair or replace

Check, take out or repair