Chery QQ - Page 608

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