Brake system
P-8
(Check with a measuring instrument)
1. As shown in Fig., connect respectively with the SST vacuum gauge and pedal pressure detector.
Attention: Exhaust the air in the SST at the instrument A with a special instrument and a pedal pressure
detector.
2. After the air exhausted from the SST, detect as per the following steps:
a) Check the vacuum leakage
Under no-load:
1. Start the engine.
2. When the vacuum gauge reading reached 66.7kPa{500mmHg}, shut down the engine.
3. Shut down the vacuum gauge for 15s. If the vacuum indicates 63.3-66.7kPa {475-500mmHg}, it means
that the vacuum booster is in normal operation.
Under loading conditions
1. Start the engine.
2. Step down the brake pedal with the force in 196N {20kgf}.
3. Hold depressed the brake pedal, and shut down the engine when the vacuum gauge reading reached
66.7kPa {500mmHg}.
4. Observe the vacuum gauge for 15s. If the vacuum degree indicates 63.3-66.7kPa {475-500mmHg}, it
means that the vacuum booster is in normal operation.
b) Check the hydraulic pressure
1. Shut down the engine (vacuum degree: 0kPa {0mmHg}. If the fluid pressure is now within the specified
range, it means that the vacuum booster is in normal operation.
Pedal pressure Fluid pressure
196N{20kgf} 790kPa{8kgf/ cm
2
}min
Vacuum gauge
Pedal dynamometer
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