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THE INTERVALS BETWEEN THE FIRST AND SECOND TIME THE PEDAL IS PUSHED AS THE

SECOND AND THIRD TIME MUST BE OF FIVE SECONDS.

Power brake operation check

With the engine stopped, push the brake pedal for several times, applying the same force each time it

is pushed. Make sure the brake pedal height does not change each time it is pushed. Start the engine

while pushing the brake pedal, the power brake works properly if the brake pedal is slightly moved.

Checking the power brake hermetic seal with loaded vehicle

With the engine on, push the brake pedal. By pushing and holding down the pedal, shut off the engine.

The power brake works properly if the brake pedal height does not vary, for at least 30 seconds.

Power brake simple check

1. Power brake hermetic seal check. After shutting off the engine, push the brake pedal for several

times. The second, third time the pedal is pushed, the brake pedal position must be higher with respect

to the original position.

2. Power brake operation. Start the engine pushing the brake pedal. Slightly move the pedal during

the engine start-up.

3. Checking the power brake hermetic seal with the vehicle unloaded. After the engine is off, the

brake pedal height must not change.

If the power brake does not comply with requirements proceed with:

Checking the power brake by using a multimeter

4. Power brake multimeter connection.

5. Checking the power brake hermetic seal after the engine is off, vacuum must not vary during 15

seconds.

6. Power brake hermetic seal check. With the vehicle unloaded after the engine is off, the vacuum

drop must remain within 3.3 kPa, during 15 seconds.

7. Power brake operation failure.

• A hydraulic pressure of 3.13 Mpa corresponds to 10 Kg of force applied to the pedal;

• A hydraulic pressure of 3.07 Mpa corresponds to 30 Kg of force applied to the pedal;

8. Power brake operation

• A hydraulic pressure of 568.7 Mpa corresponds to 5 Kg of force applied to the pedal;

• A hydraulic pressure of 1.81 Mpa corresponds to 10 Kg of force applied to the pedal;

• A hydraulic pressure of 3.05 Mpa corresponds to 15 Kg of force applied to the pedal;

• A hydraulic pressure of 4.3 Mpa corresponds to 20 Kg of force applied to the pedal;

Power brake multimeter connection

Connect the power brake multimeter as indicated in the figure. Release air from the power brake mul-

timeter. Then perform the checks indicated below.

PORTER 1.3 16V Braking system

BS - 619

PIAGGIO PORTER 1.3 16V 2008 User Manual

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