Great Wall service chassis and body Manual — part 61
BR-40
7.Mount the front brake shoe:
(a)
Mount the lower tension spring between the front shoe
and the back shoe.
(b)
Mount the front brake shoe in such manner that the end
shoe is inserted in the wheel-brake cylinder, and mount
correctly the adjuster.
(c)
Mount the pressure spring, pressure spring cap and
claming pin.
Notice: Do not let the oil or lubricant touch the brake
shoe.
(d)
Mount the upper tension spring.
8.
Check the operation of self-adjusting mechanism.
(a)
Move the parking brake lever of rear brake shoe forward
and backward as shown in the drawing, check the self-
adjusting screw arbor to see whether it can rotate or not,
if not, check the rear brake to see which part has problem.
(b)
Adjust the adjuster length and shorten it as can as possible.
(c)
Mount the brake drum.
(d)
Drag the parking brake lever to the max distance until no
quack-quack is heard.
Braking System
Rear Brake (SF)
BR-41
9.
Check the clearance between the brake shoe and the
brake drum:
(a)
Tear down the brake drum.
(b)
Measure the inner diameter of brake drum and the outer
diameter of brake shoe, then Check the difference of the
two diameters to see whether it falls within the standard
clearance range.
Shoe clearance: 0.6mm
If it is not correct, check the parking braking system.
10. Mount the brake drum and rear wheel;
Fastening torque
(145 10)mm
11. Fill the liquid container with brake liquid and exhaust
air in the braking system.
12. Check to see whether there is leakage of brake liquid
Braking System
Rear Brake (SF)
BR-42
Braking System
Load Sensing Proportion Valve
Load Sensing Proportion Valve
Element figure
Inspection on and Adjustment of hydraulic
pressure
1.
Adjust the load on rear shaft
Load on rear shaft (including the vehicle weight): 800kg
2.
Mount the load sensing proportion valve instruments
(SST) and exhaust the air.
location plate
valve bracket
load inductive valve
braking hose bracket
flat washer
flat washer
load inductive spring
assembly
inductive spring bracket
claming head I
claming head II
split pin
shaft bush
Parts that cannot be reused after being used
snapping ring
BR-43
Braking System
Load Sensing Proportion Valve
3.
Check the rear brake pressure on the condition that
the front brake pressure increases to 7,845kPa
Rear brake pressure: (4,315
490)kPa
If the brake pressure is incorrect, adjust the hydraulic pressure.
4.
Adjust the hydraulic pressure if necessary:
(a) Adjust the length of claming head II.
When lengthen the A distance, the rear brake pressure; if A
distance is shortened, the rear brake pressure reduces.
Initial adjustment: 78mm
Adjust range: (72-84)mm
(b)
In case no even brake pressure is obtained after adjusting
the claming head, raise the valve or move it downward.
If the valve moves forward, the rear brake pressure will reduce;
if the valve moves downward, rear brake pressure will increase.
(c)
Screw up the nuts.
(d)
Adjust the length of claming head II again.
If it is unsuitable after re-adjustment, change the valve.
Disassembly of load sensing proportion valve
1.
Tear down the claming head II from the bracket;
2.
Tear down the load sensing proportion valve cluster:
(a)
Tear down the brake pipeline from the valve with SST.
A
SST
kPa
kPa
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