2006 GREAT WALL DEER Service Manual

BR-6
Operation test of vacuum booster
Remark: check the operation of vacuum booster with the
vacuum booster tester if workable.
1.Operation inspection
(a) Before starting the engine, tread down the brake pedal
several times, and check the pedal reservation distance to
ensure there is no change occurs.
(b) Tread down the brake pedal and start the engine. If the
treaded pedals continue to move downward, which means
the operation is normal.
1. Inspection on Air-tight
(a) Start the engine for 1-2 min and then turn it off. Then
tread down the brake pedal slowly for several times, if the
pedal move downward continuously in the first, but
return gradually in the second or third time, which means
the vacuum booster has a good air-tight.
(b) Tread down the brake pedal when the engine is working,
then stop the engine, but tread the pedal down. If the
reservation distance doesnít change within the 30 seconds,
which shows the air tight of vacuum booster is good.
Air-bleeding of braking system
Remark: air-bleeding is required if any operation for braking
system is conducted or the pipe line is doubted to have air.
1. Fill the oil cup with the brake liquid
Check the liquid level of oil cup after the air in each wheel
brake pump is exhausted. If necessary, add the brake liquid.
2. Connect the vinyl resin pipe with the vent screws.
Insert the other end of pipe into the container with half brake
liquid.
Remark: the air-bleeding shall begin from the longest pipe line
when the wheel-brake cylinder is exhausting the air.
3. Air exhaust of the pipe line in braking system
(a) Tread down brake pedal slowly several times.
(b) Loosen the vent screws until the brake liquid flows out
while letting the assistant tread down the pedal. Then
screw up the vent screws.
(c) Repeat this approach until there is no air in the liquid.
4. Repeat the approach for the wheel-brake cylinder.
normal
abnormal
the third time
the second time
the first time
Braking System
Inspection and Adjustment

BR-7
Check and adjust the parking brake
1. Check the stroke of operating lever of the parking
brake to see whether it is correct.
Drag the brake operating lever to the max stroke and count the
grooves it passes.
Stroke of operating lever of parking brake:
Dr
(9-10) Teeth
SL SK SY
(7-9) Teeth
2. Adjust the parking brake lever where necessary:
Remark: Adjust the rear brake shoe clearance before the
adjustment.
Brake shoe clearance: 0.6mm
(a) Loosen the locking nut and then rotate the adjustable nut
until the stroke is correct, then screw up the nuts.
(b) The brake shoe shall not be stagnant after the adjustment.
Braking System
Inspection and Adjustment

BR-8Braking System
Master Cylinder
Master Cylinder
Disassembly of Master Cylinder
1. Tear down the alarm joint for liquid level;
2. Exhaust the brake liquid with the injector:
Notice: brake liquid must not be left on the paint surface,
if any, clear it away.
3. Tear down the pipeline of braking system;
Tear down the pipeline of braking system from the master
cylinder with SST.
4. Take apart the master cylinder:
(a) Tear down the four nuts and the three-way joint.
(b) Tear down the master cylinder and sealing washer from
the vacuum booster
cup cap
filtering screen
oil cup
vacuum booster assembly
sealing liner
master cylinder bodyfront three-way valve
SST
SST

BR-9Braking System
Master Cylinder
Mount of Master Cylinder
1. Adjust the length of vacuum booster pushrod before
mounting the master cylinder;
2. Mount the master cylinder:
Mount the master and sealing washer on the vacuum booster
with four nuts.
3. Connect the two pipelines of braking system;
Mount the brake pipeline on the master cylinder with SST and
screw up the nuts.
Fastening torque

Dr SF
(18
2)N
m
SL SK SY SJ
(19
1)N
m
4. Connect the alarm switch joint for liquid level;
5. Fill the oil cup with brake liquid and exhaust the air in
the brake pipeline;
6. Check to see whether there is brake liquid leakage;
7. Check and adjust the brake pedal.
SST
SST

BR-10Brake System
Vacuum Booster
Vacuum booster
Disassembly of Vacuum Booster
1. Take apart the master cylinder
2. Tear down the vacuum hose from the vacuum booster
3. Tear down the return spring
4. Tear down the clamping pin and U-shaped clamping pin
5. Tear down the vacuum booster, sealing washer and U-
shaped clamping head
U-shaped clip head
shock pad
adjusting shim
shock pad
vacuum booster
front three-way valve master cylinder bodybracket
one-way valve
sealing liner
Disassembly of Vacuum Booster

BR-11Brake System
Vacuum Booster
Inspection on Vacuum booster parts
Operation for one-way valve inspection
(Gasoline engine)
(a) Tear down the one-way valve;
(b) Check the air to see whether it flows from the vacuum
booster side toward the engine side.
(c) Check the air, change the one-way valve if the air flows
from the side of engine toward the vacuum booster.
(d) Mount the one-way valve in the right place.
(a) Tear down the one-way valve from the vacuum pipe.
(b) Check the air to see whether it flows from the side of
vacuum room to the hose.
(c) Check the air, and change the one-way valve if the air
flows to the hose to the vacuum room.
air
engine side booster side
air airless
air
hose side vacuum side
airairless
Mount of Vacuum Booster
1. Adjust the length of vacuum booster pushrod:
(a) Mount the sealing washer on the master cylinder;
(b) Put SST on the sealing washer and descend the pin rod
until it contact lightly the piston with its top;
(c) Put top of SST downward ,and mount it on the vacuum
booster.
(d) Check the clearance between the vacuum booster pushrod
and the head of pin on SST.
(e) Adjust the length of vacuum booster pushrod until the
pushrod touches the pinhead.
2. Mount the vacuum booster, sealing washer and Ushaped
clip head.
(a) Mount the vacuum booster and sealing washer.
(b) Mount the U-shaped clip head.
(c) Mount and tighten the assembling nuts of vacuum booster.
3. Connect the U-shaped clip head and the brake pedal:
Encase the U-shaped clamping pin in the hole of U-shaped clip
head and the brake pedal, and then mount the spring pin on the
U-shaped clamping pin.SST
washer
SST
(Diesel engine)

BR-12Brake System
Vacuum Booster
4. Mount the pedal return spring.
5. Mount the brake master cylinder
(see Page BR-8)
6. Connect the hose and the vacuum booster.
7. Fill the oil cup with brake liquid and exhaust the air in
braking system.
(see page BR-6)
8. Check the liquid leakage;
9. Check and adjust the brake pedal
(See page BR-5)
10. Check the operation
(See Page BR-6)

BR-13
Front Brake
Element figure
No. 2 lock plate of brake padNo. 1 lock plate of brake pad
silent pad cluster
brake pad assembly
silent pad cluster
caliper body
No. 2 lock plate of
brake pad No. 1 lock plate of
brake pad
long sliding caliper liner
sliding sleeve dust cover
caliper body
rectangular sealing ring
piston piston dust cover
piston dust cover
snapping spring
sliding sleeve dust cover
short sliding caliper linershort sliding caliper sleevesliding sleeve dust cover vent screwvent screw dust cover
long sliding caliper sleeve
sliding sleeve dust cover
DrBraking System
Front Brake (Dr)