Chery S11 / Chery QQ. Manual — part 27

Chery QQ Service Manual Chassis System

Checking the air damping
1、Start the engine;
2、Run the engine for 1—2 minutes
after the engine is started;
3、Step on the brake pedal repeatedly
with equal force as usual, and
observe the stroke of the pedal. If
the stroke for the first stepping is
large while the strokes for the

subsequent stepping are gradually
reduced, it means the air damping has
been established.
4、If the strokes for the pedal have
no replaces at all, it means the air
damping has not been established.
Attention:

If the checks fail, the inspections
on the vacuum tube and sealing parts
will be needed.
Make proper replacements of the
defective parts. Repeat all the tests
after replacing the parts.

Checking the operations
1、Let the engine in the stop mode.
Step on the pedal repeatedly with
equal force and make sure that there
are no replaces in the pedal stroke.
2、After the engine is started, step
the pedal once again. If the stroke
is slightly increased, the operation
will be safe; if there is no replace
in the stroke, please contact the
maintenance

station

or

the

manufacturer.
Attention：
If the checks fail, the inspections
on the vacuum tube and sealing parts
will be needed.
Make proper replacements of the
defective parts.
Repeat all the tests after replacing
the parts.

Threetimes

Onc

e

Twi

ce

Goodg

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Chery QQ Service Manual Chassis System

３、When the engine is running, step
on the brake pedal, and stop the
engine while stepping on the brake
pedal.
４、Step on the pedal and keep for 30
seconds.
If there is no replace in the pedal
height, it means the operation is
normal. If the pedal rises, it means
the operation is not normal.
Attention：If the checks fail, the
inspections on the vacuum tube and
sealing parts will be needed.
Make proper replacements of the
defective parts. Repeat all the tests
after replacing the parts.

Steps of installation

Holding

Onc

e,

Twi

ce,

Three times

Holding

1． Align 4 bolts on vacuum booster in
left engine compartment to 4 holes on
front board.
2． Screw 4 bolts with torque
23-27N.m.
3． Use pins to connect the pedal and
vacuum booster lever and install
pins.
4． Install brake light switch.
Adjust the position of light. Insert
switch connector.
5． Install master cylinder and
prorating valve to the booster. Screw
2 bolts with 16N.m.
7. Connect vacuum hose on the

booster.

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Chery QQ Service Manual Chassis System

8、Description and operation

1)Brake gross pump
Points of attention

Use clean fluid to lubricate

rubber parts for easily mounting.

Don’t use compressed air with

lubricant on brake parts.

Drain out air for whole or partial

system after removing any
hydraulic parts.

The specified torque is used in

dry fixture.

Operate on the clean desk without mineral

oil.

The master cylinder consists of

plastic reservoir and aluminum shell.
The primary piston is used for front
brake and rear brake. Secondary
piston is used other front brake and
rear brake. Fluid level sensor in
mounted on reservoir. Proportional
valve is mounted below master
cylinder. The valve is used to offer
better balance for front/rear brake
in heavy load.
Proportioning valve
Points of attention

Don’t clean the valve in any

washing fluid. The valve is below
master cylinder. Fluid will damage
paint and electric element. Resin the
parts if fluid sprayed on vehicle.
Level sensor
Level sensor in mounted in master
cylinder. Sensor switch is in
reservoir. If the level is too low,
sensor will turn warning light on.
When the level is correct, light is
off. Please see “ Brake warning
system” in “ Diagnosis for electric
system”.

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Chery QQ Service Manual Chassis System

2) Vacuum actuator description
Points of attention

Use clean fluid to lubricate

rubber parts for easily mounting.

Don’t use compressed air with

lubricant on brake parts.

Drain out air for whole or partial

system after removing any
hydraulic parts.

The specified torque is used in

dry fixture.

Operate on the clean desk without

mineral oil.

3) Brake caution system description

The yellow ABS warning light is

used in ABS system. The light is in
instrument panel. The light will work
under following process:
1. Turn on ignition switch and
engine is not started, the light will
be on.
2. Light will be on when engine

starting.

3. Light will be off after engine
starting.
The operation of light is one
important part for diagnosis ABS
system. If light is on during driving,
it means system is fault. Please see
“ Diagnosis for ABS” in “ ABS
system”.

5.1.6.4 Brake caution system circuit
description
Circuit run
The warning light in instrument panel
will be on under following
conditions:

Turn on ignition in starting

position.

Set park brake.

Brake fluid level is too low.
ECU and instrument cluster

ground.

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