Chery QQ Service Manual page 608

Sqr 472 engine
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Closed vacuum
valve & control
valve
A is not connected
with B
B is connected
with C
2. Brake Booster in Braking
Piston
Constant
pressure
chamber
Booster
push rod
Air valve
(opened)
Reaction disc
Passage B
Variable pressure chamber
When not in braking
Control valve
Air
Air filter element
C

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