Vespa Primavera 50 - Service manual > Braking system

Maintenance / Braking system

Level check

Proceed as follows:

Rest the vehicle on its centre stand with the handlebars perfectly horizontal;
Check the level of liquid with the related warning light "A".

A certain lowering of the level is caused by wear on the brake pads.

Maintenance

Top-up

Proceed as follows:

Remove the upper handlebar cover.
Remove the reservoir cap by loosening the two screws, remove the gasket and top-up using only the fluid specified without exceeding the maximum level.

Maintenance

CAUTION

ONLY USE DOT 4-CLASSIFIED BRAKE FLUID.

CAUTION

MAKE SURE THE BRAKE FLUID DOES NOT GET INTO YOUR EYES OR ON YOUR SKIN OR CLOTHES. IF THIS HAPPENS ACCIDENTALLY, WASH WITH WATER.

CAUTION

BRAKE CIRCUIT FLUID IS VERY CORROSIVE; DO NOT LET IT COME INTO CONTACT WITH THE PAINTED PARTS.

CAUTION

BRAKE FLUID IS HYGROSCOPIC; THAT IS, IT ABSORBS MOISTURE FROM THE SURROUNDING AIR. IF THE CONTENT OF MOISTURE IN THE BRAKE FLUID EXCEEDS A CERTAIN VALUE, BRAKING WILL BE INEFFICIENT.

NEVER USE BRAKE FLUID FROM OPEN OR PARTIALLY USED CONTAINERS.

UNDER NORMAL CLIMATIC CONDITIONS, REPLACE FLUID AS INDICATED IN THE SCHEDULED MAINTENANCE TABLE.

N.B.

SEE THE BRAKING SYSTEM CHAPTER WITH REGARD TO THE CHANGING OF BRAKE FLUID AND THE BLEEDING OF AIR FROM THE CIRCUITS.

Recommended products
AGIP BRAKE 4 Brake fluid.

SAE J 1703 -FMVSS 116 - DOT 3/4 - ISO 4925 - CUNA NC 956 DOT 4 synthetic fluid

Locking torques (N*m)
Brake pump reservoir screws 15 to 20

Headlight adjustment

Proceed as follows:

1. Position the vehicle in running order and with the tyres inflated to the prescribed pressure, onto a flat surface 10 m away from a half-lit white screen; ensure that the longitudinal axis of the vehicle is perpendicular to the screen;

Maintenance

2. Turn on the headlight and check that the boundary of the light beam projected onto the screen is not higher than 9/10 or lower than 7/10 of the distance between the centre of the headlight and the ground;

3. Otherwise, adjust the right headlight with screw "A".

Maintenance

N.B.

THE ABOVE PROCEDURE COMPLIES WITH THE EUROPEAN STANDARDS REGARDING MAXIMUM AND MINIMUM HEIGHT OF LIGHT BEAMS. REFER TO THE STATUTORY REGULATIONS IN FORCE IN EVERY COUNTRY WHERE THE VEHICLE IS USED.

Anti-evaporation system

Canister inspection

The canister is essential to treat the hydrocarbons present in the volume of gas that escapes from the tank when there is an increase in internal pressure (tank heating induced by the cooling radiator, by the motor or by the external environment).

The volume of air is limited by the operation of the ventilation valve (Roll-over).

Although the amount of hydrocarbons coming from the tank is small enough to avoid the saturation of the canister, it is necessary to regenerate the activated carbon by means of a reversed flow of ambient air sucked by the engine.

These vacuums of pollution and carbon regeneration take place at each cycle of use of the vehicle.

To control the canister, it is necessary to proceed with its removal while keeping the 2 pipes connected.

Shake the Canister and make sure there is no noise.
Using a compressed air gun, blow alternately in 3 ducts and make sure that pressure does not build inside the canister.
Check that the air flow is kept free and that no carbon residues escape out of any pipe.

If you detect noise, clogging or loss of carbon, replace the canister.

Maintenance

Safety valve check

The cleaning of the canister is achieved via a controlled flow of air from the vacuum socket in the intake manifold.

To ensure that the engine works properly, it is necessary that the flow of air is not too intense, this is achieved by means of a restricted section 0.0354in (0.9 mm) formed in the socket on the intake manifold.

The relative connecting pipe with the canister, includes the installation of the safety valve.

This is a one-way valve which ensures the passage of air in the direction of the manifold when the control vacuum is greater than 2.9PSI (20kPa) (200mbar).

The vacuum of the engine at idle, causes a slight flow of air easily compensated by the idle speed adjustment parameters.

When the vehicle is stopped, the safety valve will be closed due to the lack of control vacuum therefore, any expansion of the fuel tank, will not cause pollution of the intake manifold, and then cause flooding of the engine.

To control the valve, it is preferable to it, alternatively just access the manifold side pipe.

Connect the MITY-VAC pump on the engine side duct.
Select the pump command on the "vacuum" position, then slowly apply vacuum up to the valve threshold check opening.

Maintenance

If you detect different pressures, replace the valve.

N.B. An opening vacuum that is too high, causes a lack of regeneration of the activated carbon; vice versa, an opening vacuum that is too low, increases the flow of air to the engine causing the thinning of idle.

Characteristic

Standard opening vacuum
(2.90-3.77)PSI (20-26)kPa (200-260)mbar

Roll-over valve check

The valve must enable the following results:

Aeration of the tank while riding (the ambient air enters the tank in relation to the volume of fuel used).
Pressurisation of the tank (while riding or during a break, you may experience increases in the temperature inside the tank. The valve must pressurize the tank to limit the escape of fuel vapour to the canister).
Prevent pollution of the canister with the liquid fuel (in case of fall of the vehicle, the valve must block the connection with the canister).

To control the valve, it is necessary to remove it from the vehicle.

For the check, it is planned to use a MITY-VAC pump and a piece of tube, then proceed as follows:

Connect the MITY-VAC pump to the lower joint of the safety valve (white).
Select the "vacuum" control position and keeping the valve in the vertical axis, check that it is possible to intake air without movements of the gauge needle.
Switch the control of the pump to "pressure" and, keeping the valve in the vertical axis, check that it is possible to pressurise the valve up to values slightly below 1.45PSI(~0.87PSI) 10kPa(~6kPa) 100mbar(~60mbar).

Maintenance

N.B. The setting pressure is easily recognisable in that, when it is reached, the valve discharges the air emitting a little noise.

Position the valve in the horizontal axis and check that you can pressurise it to values well above the setting pressure (eg. 7.25PSI (50 kPa) (0.5bar) without guaranteeing the maintenance).

If you detect abnormal behaviour, replace the valve.

N.B. Any malfunction of the valve can cause deformation of the fuel tank or aggravate the working conditions of the canister.

Troubleshooting

Engine

Poor performance

POOR PERFORMANCE

Troubleshooting