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