Chery S11 / Chery QQ. Manual — part 128

Working Principle of Proportioning Valve

— When the Pressure is Low

Spring

Piston

C

h

a

m

b

er

A

s

ide

C

h

a

m

b

er

B

s

ide

Piston

Small area

Large area

F

a

+F

s

=F

b

Working Principle of Proportioning Valve

— When the Pressure is high

F

a

+F

s

<F

b

When the pressure is
higher than some point,
the difference between
chambers A and B will
overcome the spring's
elastic force to make
the piston move until
the port C is closed.

1.When the Braking Pressure is Low

Cylinder cup

Spring

To rear-wheel brake wheel cylinders

Piston

From brake master cylinder

2.When the Braking Pressure is High

In contact

Piston