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1.Turn the ignition switch
to the LOCK (OFF) position. Depressurise the power supply
system of the hydraulic brake booster (HBB) by depressing
the brake pedal at least forty times until the pedal effort
becomes high.
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2.Check that the reservoir
fluid level is at the MAX position.
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3.Chock the wheels and
release the parking brakes.
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4.Turn the ignition switch
ON, and measure how much time is elapsed after the pump
motor starts until it stops. Standard value: 20
- 80 seconds
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5.After the pump motor
stopped, start the engine. The brake warning lamp should not
be turned on.
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6.Stop the engine, and then
turn on the ignition switch again.
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7.When the brake pedal is
depressed four or five times, the pump motor should start
and then stop.
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8.Depress the brake pedal
four or five times again, and then measure how much time is
elapsed after the pump motor starts until it stops.
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9.Depress the brake pedal
fully consecutive 15 - 20 times for ten seconds. The brake
warning lamp should illuminate and the buzzer should
sound. Standard value: 2 - 11
seconds
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- Turn the ignition switch to LOCK (OFF) position.
Depressurise the power supply system of the
hydraulic brake booster (HBB) by depressing the
brake pedal at least forty times until the pedal
effort becomes high.
- Depress the brake pedal, and turn the ignition
switch ON. Then check the pedal. The pedal should be
lowered. If no, the pedal is defective.
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1.Turn the ignition switch
to the LOCK (OFF) position. Depressurise the power supply
system of the hydraulic brake booster (HBB) by depressing
the brake pedal at least forty times until the pedal effort
becomes high.
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![](../../../img/35/AC604854AB00ENG.png)
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2.Connect a pressure gauge
and pedal effort gauge as shown, and bleed air from the
pressure gauge. 3.Carry out the operation test
without vacuum assist as follows: (1)
Turn the ignition switch to the LOCK (OFF) position.
Depressurise the power supply system of the hydraulic brake
booster (HBB) by depressing the brake pedal at least forty
times until the pedal effort becomes high to observe the
relationship between the pedal effort and the fluid
pressure. Standard value:
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Pedal effort
N
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Fluid pressure at
front wheels MPa
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Fluid pressure at
rear wheels MPa
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100
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0.6 or more
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0
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500
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4.5 or more
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0
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4.Carry out the operation test with power
assist as follows: (1)
Turn the ignition switch ON. Stop the pump motor, and then
check the relationship between the pedal effort and the
fluid pressure. Standard value:
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Pedal effort
N
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Fluid pressure at
front wheels MPa
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Fluid pressure at
rear wheels MPa
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100
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3.0 - 4.0
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3.3 - 4.3
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200
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8.0 - 10.0
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8.0 - 10.0
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400
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14.0 - 18.0
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14.0 - 18.0
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500
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15.0 - 19.0
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15.0 - 19.0
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![](../../../img/35/AC604855AB00ENG.png)
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- Chock the wheels and start the engine.
- Release the parking brake lever, and depress the
brake pedal fully consecutive 15 - 20 times for ten
seconds. The brake warning lamp should illuminate
and the buzzer should sound.
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