GREAT WALL HOVER 2006 Service Repair Manual

Brake-5
Check and adjustment
Check and adjustment of brake pedal
1. Check the correctness of height of pedal
Distance from pedal to lower front apron: 152mm, Operating stroke
of pedal push bar is 1mm.
a. Disconnect the brake lamp switch wire connector; loose the
tightened nut; rotate the brake switch to the position not contacted
to limit block of brake pedal
b. Loose the lock nut of operating connecting rod; use the thinnose
pliers to rotate the operating connecting rod to adjust the height
of brake pedal to the standard value; lock the block nut tightenedly
when reach the standard value.
c. Rotate the brake lamp switch to contact with the limit block of
brake pedal; then rotate 1/2
1 round continuously; tighten the
block nut;
d. Connect the wire connector of brake lamp switch;
e. The brake lamp should not be light when the brake pedal is
released.
3. Check the free stroke of pedal
Free stroke of pedal: 4
6mm
In the status of engine is stop, step on the brake pedal for 2
3 times
after eliminate effect of the brake assist, push down the brake pedal
by hand to just with the resistance, then measure its displacement
(free stroke). It should be in accordance with the standard value.
pedal push rodparking lamp switch
free stroke of pedal pedal push rod

Brake-6
4. Adjust the stroke of pedal if necessary
a. Rotate the pedal push bar to adjust the free stroke if the stroke
length is improper.
b. Start the engine to confirm the free stroke of pedal.
c. Check the height of pedal after adjusts the free stroke of pedal.
d. The height difference of brake pedal and clutch pedal to front
apron is 0
8mm.
e. The height difference of brake pedal and accelerator pedal to the
front apron is 45
5mm.
Vacuum assist
Remarks:
Use the vacuum assist tester to check the operation of vacuum
assist if possible.
1. Operation inspection
a. Step on the brake pedal for several times before start the engine
and check the reserved distance which should not be changed.
b. Step down the brake pedal and start the engine. If the pedal
moves downwardly a little, then it means the normal operation;
if the brake pedal moves upwardly, then it means the brake
assist is damaged.
2. Air tightness inspection
a. Start the engine and shut off it after 1
2 minutes. Step down the
brake pedal slowly for several times. If the pedal moves
downwardly all long at the first time, but moves upwardly little
by little after second or third times, then it means the vacuum
assist has the sound air tightness. If the pedal height is without
variety, then it means the brake assist is damaged.
b. Step down the brake pedal when the engine is operating; then shut
off the engine but step down the pedal, if the pedal keeps the
stroke without variety within 30s, then it means the vacuum
assist has the sound tightness; if the brake pedal moves upwardly,
then it means the brake pedal assist is damaged.

Brake-7
Air discharge of brake system
Remarks:
It should discharge the air if operate on the brake system or as-
sume the brake system pipeline has the air.
Caution:
Must not keep the brake fluid on the paint surface, wipe off it if
has.
1. Fill the liquid reservoir up with the brake fluid.
Check the liquid level in liquid reservoir after discharge the air of each
wheel pump. Filled with the brake fluid if necessary.
2. Connect the polyethylene resin pipe to the overflow hole plug of
wheel pump;insert the other end of pipe into the container with
half of brake fluid.
Remarks:
When discharge the air of wheel brake pump, it should begin
from the longest pipeline.
3. Air discharge of brake system pipe
a. Step down the brake pedal slowly for several times.
b. Let the assistant presses down the pedal, at the same time screw
off the overflow hole plug until the brake fluid flows out. Then
switch off the overflow hole plug.
c. Repeat the procedure until the liquid is without air bubble.
Tightening torque of overflow hole plug: 11N
m
4. Process the same procedure for each wheel pump.
hexagon flange nut
brake bracket
welded assembly
support sleevereturn spring
bush
screw bar
pin shaft
pedal cover block
rocker arm
welded assembly
Brake pedal

Brake-8
Replacement of pin shaft
Remarks:
When the connecting fork pin shaft and pin hole is over worn, it
should replace the pin shaft bush.
Remarks:
When the clearance between the brake pedal shaft and bush is
large, it should remove the pedal and replace the bush.
push barlock nut
inner distance
fork pin shaft
Parking brake
parking crank assembly
switch assembly
rear parking brake pull wire (R)
rear parking brake pull wire (L)
brake pull wire clip
1. Adjust the parking crank assembly in position, 6
8 teeth.
2. When the parking brake pull wire is tightened, the torque should
be no more than 400N
m.

Brake-9
Front brake
front brake oil pipe
cliper bracket
outer silencing plate combination
lower circlip of
brake block
brake block assembly
lower circlip of brake block
wear limitation alarm plate of brake block
lnner silencing plate combination
Inner brake block
silencing plate
upper circlip of brake block (I)upper circlip of brake block (II)
piston
dustproof cover
guide pin dustproof cover
guide pin rubber covercooper washer
tong
air-bleed
bolt cover
location pin
guide pin dustproof coversquare seal ring
N
m: Specified torque
Piston
Replacement of brake block
Remarks:
When brake during the travel process, if the front wheel has the
continuous screams noise, then it should check the wear limitation
alarm plate of brake block. If the alarm plate has the abrasion
mark with brake disc, then it should replace the brake block .
1. Remove the front wheel
2. Check the thickness of abrasion material of brake block.
Check the thickness of abrasion material of brake block by the watch
hole on the tong.
Replace it if is not within specified range.
Min. thickness : 2.0mm

Brake-10
3Lift the main body of brake caliper.
a. Remove the hexagon flange bolt.
b. Lift the brake pump and hang it by rope to protect the brake oil
pipe.
Remarks: Do not screw off the brake oil pipe and bleed plug.
4. Remove the following components
a. Two pieces of brake block
b. One piece of silencing plate
c. Two piece of silencing plate combination
d. One wear limitation alarm plate of brake block
e. Four brake block circlip plates
5. Measure the thickness of brake disc
(Refer to step 2 of “ Inspection of component of front brake” )
6. Measure the circular runout of brake disc.
(Refer to step 3 of “Inspection of component of front brake”)
7. Install the brake block circlip plate

Brake-11
8. Install the new brake block
a. Install a wear limitation alarm plate of brake block on the inner
brake block.
b. Install a silencing plate and a silencing plate combination on the
inner brake block.
c. Install a silencing plate combination on the on the outer brake
block.
d. Install two brake blocks; let the wear limitation alarm plate is in
the inside of brake caliper.
Caution: It is unallowable that the operating surface of brake
block andbrake disc is polluted by the grease and paint.
e. Suck a few of brake fluid form the liquid reservoir (prevent the
brake fluid from overflowing from liquid reservoir).
f. Use the special tools to press the piston .
9. Install the brake pump
Install and tighten the hexagon flange bolt.
Tightening force: 25
35Nm
Remarks: Only can replace the brake block on a wheel in one
time to avoid the piston on another wheel is pushed out.
10. Install the front wheel
Tightening force of the wheel fixing nut is 120N
m
11. Check whether the brake fluid level is in the specified position.

Brake-12
Removal of brake pump
1. Remove the brake pipeline
Remove the brake pipeline. Use a container to contain the brake fluid.
2. Remove the brake pump from the clamp bracket
a. Remove the hexagon flange bolt, location pin and guide pin.
b. Remove the brake pump.
3. Remove the brake block
a. Two brake blocks
b. One silencing plate
c. Two silencing plate combinations
d. One wear limitation alarm plate of brake block
e. Four brake block circlips
Disassembly of brake pump
1. Remove the piston form the tong
a. Place the wood block between the tong bracket and tong body .
b. Use the air gun or air pipe to aim at the brake oil pipe hole; remove
the piston form the tong.
c. Use the clean rag or soft cloth to take out the piston.
Warning: It must not place the finger in front of the piston when
use the compressed air.
2. Remove the piston gasket from the tong body.
Use the paper clip to remove the piston gasket.
Caution: The used tools must not be sharp to prevent from scratching
the piston gasket.

Brake-13
Check the component of front brake
1. Measure the thickness of the brake block bush.
standard thickness: 9.0mm
minimum thickness: 2.0mm
It should replace the brake block if less than minimum thickness or
has uneven abrasion.
2. Measure the thickness of the brake disc.
standard thickness: 26.0mm
minimum thickness: 24.0mm
It should repair or replace the brake disc if the brake disc is damaged
or worn or its thickness is
less than minimum thickness.
3. Measure the circular runout of the brake disc.
Remarks: It should ensure that the bearing is adjusted correctly
before the measurement . maximum circular runout : 0.11mm
4. Replace the brake disc if necessary.
a. Remove the tong bracket form the steering knuckle.
b. Remove the hub and brake disc. (Refer to section “Front hub”)
c. Install the new brake disc; tighten the connecting bolt to the
specified torque.
Tightening force: 90
100Nm.
d. Install the hub and brake disassembly. (Refer to section “Front
hub”)
e. Install the tong bracket on the steering knuckle; tighten the
connecting bolt to the specified torque.
Tightening torque 140
10Nm.

Brake-14
Assembly of brake pump
1. Preparation work
All components should be washed, dried by wind and without foreign
material before the assembly. During the assembly, cost the guide pin
and location pin with proper vacuum silicon based grease; coat the
working surface of piston and square gasket with proper rubber
lubricant.
2. Install the piston gasket in the tong body.
a. Screw the bleed screw into the bleed hole;
tightening torque 7
10Nm.
b. Install the square gasket in the sealing groove of two cylinders of
pump respectively after coat its working surface with proper
rubber lubricant.
3. Install the piston with dustproof cover in the tong
a. Cover the dustproof cover on the piston.
b. Lengthen the dustproof cover to expose the bottom of piston
from the dustproof cover clip ring; use the tool (for example: steel
wire about
2mm ) to assist insert the clip ring into the cylinder
hole clip ring groove.
Caution: The used tools must not be sharp to prevent the damage
of dustproof cover.
c. Press the piston to the bottom of cylinder hole by hand.
4. Pre Install the guide pin and location pin on the tong bracket.
a. Install the guide pin dustproof cover on the guide pin and location
pin respectively.
b. Screw the guide pin and location pin in the tong bracket
respectively.
Caution: Do not damage the guide pin dustproof cover.