Great Wall Hover. Manual — part 71
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 rod
parking 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 sleeve
return 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 bar
lock 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.
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