Mazda 2006 MX-5 Service Highlights page 239

MASTER CYLINDER
Pressure reduction mode
• During pressure reduction mode, when the wheels may possibly lock-up due to emergency braking or similar,
the inlet solenoid valve closes and the outlet solenoid valve opens. The brake fluid being applied to the caliper
piston flows out through the outlet solenoid valve into the reserve tank, thereby decreasing pressure. During
this operation, the pump motor operates, returning the brake fluid stored in the reserve tank to the master
cylinder. (Description for single front wheel only)
Solenoid valve operation table
Inlet solenoid Outlet solenoid
valve valve
ON (closed) ON (open)
MASTER CYLINDER
ANTILOCK BRAKE SYSTEM
PRESSURE INCREASE MODE
DAMPER CHAMBER
PUMP
PUMP MOTOR
RESERVOIR
CALIPER PISTON
Pump motor,
pump
Operating
PRESSURE REDUCTION MODE
DAMPER CHAMBER
CALIPER PISTON
INLET
SOLENOID
VALVE
OUTLET
SOLENOID
VALVE
INLET
PUMP
SOLENOID
VALVE
PUMP MOTOR
RESERVOIR
E5U413ZS5004
OUTLET
SOLENOID
VALVE
E5U413ZS5005
04–13–5
04–13