PIAGGIO PORTER 1.3 16V 2008, Service Manual

Page: 620 / 892

KEY:
1. Gauge to measure force applied to the pedal
2. Low pressure gauge
3. Pressure gauge
4. Vacuum pump connection hose
Power brake hermetic seal check
Start the engine. Shut the engine off when the low pressure gauge indicates approx. 500 mmHg. Then,
check the power brake air sealing.
Checking the power brake hermetic seal with loaded/unloaded vehicle
With the engine on, push the brake pedal applying 20 kg force. Shut the engine off when the low pres-
sure gauge indicates approx. 500 mmHg. Then, check the power brake air sealing.
Power brake operation failure check
With the engine off, set the low pressure gauge to zero. Under these conditions, check the ratio between
the force applied on the pedal and hydraulic pressure.
Power brake operation check
With the engine on, set the value of the low pressure gauge to approx. 500 mmHg. In this position, push
the brake pedal. Then, check the ratio between the force applied on the pedal and hydraulic pressure.
Braking system
PORTER 1.3 16V
BS - 620