Great Wall Florid. Manual — part 26

GWFLORID Maintenance Manual

102

Parking Brake Control Mechanism Assembly

Components

Parking brake lever removal and installation

1. Removal

(a) Remove the auxiliary facia console, and pull the park-

ing brake lever to the lowest position.

(b) Remove the two hexagon head bolts used to stablize

the parking brake lever onto the vehicle floor.

(c) Loosen the parking brake cable's adjusting nuts with a

wrench, and take the cable out from the equalizing frame.

2. Installation

Complete the parking brake control mechanism's installation

by reversing its removal sequence. Please pay attention to

the items below:

(a) The open end of the parking brake lever assembly's

cable clamp should face down.

(b) While installing the parking brake lever, the assembly

structure must be properly adjusted, which is usually 5

to 8 gears.

(c) The tightening torque of the coupling bolt for the

parking brake control mechanism assembly and vehicle

body is 20 N·m.

A

B

C

D

Q1420612

Q1460825

Q32006

Q1420616

Parking brake control mechanism assembly

Q1420612

A

B

C

D

Left parking brake cable assembly

Right parking brake cable assembly

Button

control lever

Control jacket

Dust cover

Lock nut

Lock nut

Switch assembly

Adjusting nut

Equalizing frame

Pull rod

103

Brake System

Vacuum Booster with Brake Cylinder Assembly

Components

Areas of Importance

1. The vacuum booster with brake cylinder assembly is tightly connected with the brake pedal assembly on

the cowl panel using four nuts. It is also connected with the brake pedal push rod via an center pin and

lock pin. Thus before removal of the assembly, first loosen the rigid pipe fitting with an open-end wrench,

disconnect the lock pin and center pin using pliers, loosen the four nuts, and then proceed with the booster.

2. Tighten the lock nuts on brake master cylinder and vacuum booster according to the specified torque,

and coat with signal paint.

3. Dimensions between the rear housing head face and the adjusting fork hole center is adjusted to

standard before it leaves factory. Please do not adjust it again.

4. The vacuum booster valve rod on the vehicle must be in a free state.

5. The brake master cylinder's working agent is DOT4 brake fluid. It must not be mixed with any other

brake fluid.

Problems and symptoms

Causes

Eliminating methods

Master cylinder's oil reservoir is

severely leaking

The master cylinder, slave cylinder, or hydraulic line

is leaking.

Eliminate the areas with leaks (in general, it may be that

the pipe fitting's tightening torque is not enough, check

one by one and tighten as necessary)

1. Vacuum booster not sufficient

2. No boost when the engine is off

3. May lead to unsteady engine idling

when severe

1. Under non-operating conditions, the vacuum booster

leaks air.

2. Front and rear housing connection are not sealed.

3. Booster's front and rear gas seal sealing failure.

4. Vacuum check valve leaks.

1. Replace the front and back gas seal and control valve

assembly.

2. Replace the vacuum booster.

3. Replace the vacuum check valve assembly.

Brake pedal is heavy with no boost

effect

1.Under non-operating conditions, the vacuum booster

leaks air.

2. Booster diaphragm worn and damaged.

3. Control valve ring cup worn and damaged.

1. Replace the front, back gas seal and booster diaphragm.

2. Replace the vacuum booster.

3. Replace the control valve assembly.

Spongy pedal when braking

1. There is air in the brake fluid.

2. Cylinder or slave cylinder leaks oil.

3. There is brake line seepage.

1. Eliminate the air in the system.

2. Inspect the cylinder and sub-pump cup and replace

with new parts.

3. Inspect the pipeline and eliminate the seepage.

When continuously step on the brake

pedal, the pedal will gradually change

and expand till the highest extend.

Pump valve opening blockage.

Brake fluid cleanliness is insufficient, please replace the

brake fluid.

Troubleshooting

Oil cup cover

Oil cup body

Check valve

Check valve

seat

Vacuum booster

Pad

Lock nut

Rod clevis

Coupling nut

Rectangular sealing ring

Cylinder body

Fluid supply

sealing ring

GWFLORID Maintenance Manual

104

Removal of the vacuum booster
with brake cylinder assembly

1. Discharge the vacuum.

If there is vacuum inside of the booster, before removal, step

on the brake pedal 3-5 times, so as to discharge the vacuum.

2. Oil discharge.

To avoid a large amount of brake fluid flowing out when

removing the brake pump, it's suggested to siphon the brake

fluid from the reservoir into another container using a hose,

or loosen the drain connector and collect the fluid in the

container, then drain the brake fluid inside of the pump by

stepping on the brake pedal.

3. Remove the drain connection.

Use a M10 open-end wrench to remove the drain pipe

connection, promptly plug the outlet port to prevent pollution.

4. Use needle nose pliers to remove the lock pin from

the vacuum booster and the brake pedal's connecting

center pin.

5. Remove the vacuum booster's push rod and the pedal's

connecting center pin, and remove the return spring.

Push rod: Stepping onto the pedal

in order to pass the force

Oil cup cover

Hose

Clean container

Unscrew the drain connection

Lock pin

Return spring

Center pin

105

Brake System

3. Remove the check valve assembly.

Pull out the check valve and valve seat from the vacuum

booster's front case as shown on the left.

Disassembling the vacuum booster with
brake cylinder assembly

1. Brake master pump removal.

Take down the lock nuts between the fixed brake master

pump and front case with a M13 sleeve, and then forcibly

pull out the brake master pump.

Caution: Do not lose the rectangular sealing ring.

2. Remove the brake reservoir assembly.

Push out the elastic cylindrical pin from the hole of the oil

cup’s foot with a suitably sized screwdriver, and then pull

out the oil cup from the pump in the direction as shown on

the left. If necessary to take off the brake reservoir cover,

twist it off manually.

6. Screw off the coupling bolt between the vacuum booster

and the pedal bracket with a M13 sleeve.

7. Extract the vacuum booster with brake cylinder assem-

bly.

Removal of the vacuum booster with brake cylinder assembly

is now complete.

Check valve

Check valve seat

Lock nut

Rectangular

sealing ring

Elastic cylindrical

pin

Bolt