Shoes And Drums - PIAGGIO Ape Workshop Manual

Braking system
- Bring the piston to the end of their stroke so that any remaining air and a little oil are expelled.
- Plug (by hand) the exit hole of the oil from the threaded shank.
- Gradually release the pressure on the piston, making sure that it returns to the end of the stroke so
that the oil may flow out of the reservoir into the pump body;
- Repeat the above steps until, pushing the piston to the end of its stroke, a jet of air-free oil comes out
of the oil discharge hole on the threaded shank; then plug the hole and return the piston to rest position.
When the operations as described above are carried out, add oil in the pump reservoir to keep it always
filled.
Once ascertained that the fluid intake conduit is not damaged especially where the connections are,
the complete braking assembly is ready to be refitted on the frame, and the pump, full of oil, may be
connected to the hydraulic circuit.
Recommended products
AGIP BRAKE 4 Brake fluid
Specifications - FMVSS DOT 4
OIL REFILL IN THE HYDRAULIC CIRCUIT
A) - Push down the pedal to the end of its travel and slowly let it return to its starting position, repeating
the operation until the pedal feels a back pressure. As this operation is carried out add oil to the tank
to prevent the pump from discharging.
B) - Lower the pedal, loosen the bleed screws on the front wheel, let the air out, after this bleed point
has been connected through a small rubber pipe to a tray full of brake oil.
C) - Repeat the operation as from point A) until all air bubbles have come out of through the pipe: at
this point fit back the bleed screw, while keeping the pedal pushed down.
D) - Repeat the above procedures for the other tires.

Shoes and drums

CHECKING THE BRAKE SHOES AND DRUMS
Check the thickness of the gaskets: if they are deteriorated or worn, replace the entire shoe assembly.
Check the efficiency of the return springs: if these are deformed, replace them. Inspect the brake drums:
replace them if they are scored or oval-shaped or, whenever possible, turn and lap the inside diameter.
In the filling operations, a maximum oversize of 0.6 mm on the regular drum ø is allowed.
N.B.
THE BRAKE DRUMS ARE FITTED WITH AN INSPECTION HOLE (WITH A SCREW CAP) WHICH
ALLOWS THE WEAR CHECK OF THE BRAKE GASKETS WITHOUT REMOVING THE DRUM.
CAUTION
BRAKING CIRCUIT FLUID IS HYGROSCOPIC, IT ABSORBS HUMIDITY FROM THE SURROUND-
ING AIR.
IF THE HUMIDITY IN THE BRAKE FLUID EXCEEDS A CERTAIN VALUE, THE RESULT IS AN
INEFFICIENT BRAKE. UNDER NORMAL DRIVING AND CLIMATIC CONDITIONS THE FLUID
SHOULD BE REPLACED EVERY TWO YEARS.
IF THE BRAKES UNDERGO SEVERE OPERATING CONDITIONS THE LIQUID SHOULD BE RE-
PLACED MORE FREQUENTLY.
BS - 100
APE TM Benzina