Mazda RX-8 2004 Service Highlights page 235

Function Of Main Component Parts
Part name
Inlet solenoid valve
Outlet solenoid valve
Reserve
Pump
Pump motor
Operating
Normal braking or pressure increase mode
• During normal braking or pressure increase mode the inlet and outlet solenoid valves are not energized: the
inlet solenoid valve is open and the outlet solenoid valve is closed. Brake fluid pressure from the master
cylinder flows through the inlet solenoid valve and is transmitted to the caliper piston. At this time, the pump
motor does not operate. (Description for single front wheel only)
Solenoid valve operation table
Inlet solenoid Outlet solenoid
valve valve
OFF (open) OFF (closed)
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)
04–13–4
ANTILOCK BRAKE SYSTEM
• Adjusts the fluid pressure in each brake system according to ABS CM signals.
• Adjusts the fluid pressure in each brake system according to ABS CM signals.
• Temporarily stores the brake fluid from the caliper piston to ensure smooth
pressure reduction.
• Returns brake fluid stored in the reserve back to the master cylinder.
• Operates the pump according to ABS CM signals.
Pump motor,
pump
Stopped
Function
INLET
SOLENOID
VALVE
R F
OUTLET
SOLENOID
VALVE
RESERVE
MASTER CYLINDER
PUMP
PUMP
MOTOR
CHU0413S006