Chery S11 / Chery QQ. Manual — part 123

Brake Booster not in Braking

Variable-pressure chamber

- chamber A

Relationship
between F

b

+ F

s

and F

a

F

b

=F

a

F

s

pushes the

piston to the right.

Brake master cylinder

Spring

Piston

Valve

Cylinder sleeve

Vacuum

To brake

wheel

cylinder

Constant-pressure chamber

- chamber B

Relationship
between F

b

+ F

s

and F

a

F

b

+ F

s

< F

a

F

a

pushes the

piston to the right

Vacuum

Brake master cylinder

Hydraulic

pressure

Air

Valve

Brake Booster in Braking

Brake Booster Structure

Vacuum

Check valve

Constant-pressure chamber

Diaphragm

Power piston

Reaction disc

Valve body

Air

Variable-pressure chamber

Booster
housing

Push rod

Brake master

cylinder

Diaphragm spring

Booster housing

sealing member

Booster housing

sealing member

Air filter

Valve control

lever

Opened vacuum
valve & control
valve

A is connected
with B

1. Brake Booster not in Braking

Piston

Passage A

Passage B

Constant

pressure

chamber

Variable pressure chamber

Air valve

(closed)

Air valve return spring

Air filter element

Valve control lever

Valve body

Control valve spring

Control valve

Vacuum valve (opened)

When not in braking