Chery T21 2014 Service Manual page 1104

25 - BRAKE CONTROL SYSTEM
4. ABS Operating (Boost) Condition
When ABS operates under relief pressure condition, if brake fluid is drained excessively or friction
coefficient between wheel and road surface increases, it needs to increase each wheel pressure. In this
case, the ABS control module transmits command that increases wheel pressure to the hydraulic control
module. In other words, the normal open valve opens oil passage and the normal close valve cuts off oil
passage, in order to increase the wheel cylinder pressure. Brake fluid stored in the low pressure
accumulator is supplied to each wheel cylinder through the master cylinder and normal open valve.
Solenoid Valve
Normal Open Valve
Normal Close Valve
FL
ABS system operates circularly under relief, maintaining and boost pressure conditions until vehicle is
completely stopped, so the vehicle braking and steering performance will be guaranteed.
25
8
25–
Powered Condition
MC1
NO NO
NC NC
RR
OFF
OFF
MC2
NO
EME
NC
LPA LPA
Chery Automobile Co., Ltd.
Solenoid Valve Condition
OPEN
CLOSE
NO
NC
RL FR
RT21250060