Mazda RX-8 Workshop Manual page 1765

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2011 - RX-8 - Brakes
POWER BRAKE UNIT INSPECTION
NOTE:
The following inspection methods are simple inspection methods to judge the function of
the power brake unit.
If there is any malfunction in the power brake unit, replace the power brake unit as a
single component.
Without Using SST
Operation inspection
1. Depress the pedal several times with the engine stopped.
2. With the pedal depressed, start the engine.
3. If the pedal moves down slightly immediately after engine start, the unit is normal.
Vacuum function inspection
1. Start the engine.
2. Stop the engine after driving the vehicle for 1—2 min .
3. Depress the pedal with normal force.
4. If the first pedal stroke is long and becomes shorter with subsequent strokes, the unit is
normal.
If a malfunction is found, inspect for damage to or improper installation of the
check valve and vacuum hose. After repairing, inspect again.
Vacuum loss function inspection
1. Start the engine.