APRILIA RS 125 Euro 4 Service Manual page 302

Braking system
NOTE
THE FOLLOWING OPERATIONS REFER TO ONE FRONT BRAKE CALLIPER ONLY, BUT ARE
VALID FOR BOTH. THE VEHICLE MUST BE ON LEVEL GROUND TO BE PURGED. WHILE PURG-
ING THE HYDRAULIC SYSTEM, FILL THE RESERVOIR WITH THE NECESSARY QUANTITY OF
BRAKE FLUID. CHECK THAT, DURING THE OPERATION, THERE IS ALWAYS BRAKE FLUID IN
THE RESERVOIR.
•
Remove the rubber protection cover
from the bleed valve.
•
Insert the transparent plastic pipe in
the front brake calliper bleed valve and
slide the other end of this pipe in a con-
tainer to collect the fluid.
•
Remove the front brake fluid reservoir
cap.
•
Quickly press and release the front
brake lever several times and then
keep it fully pressed.
•
Loosen the bleed valve 1/4 of a turn so
that the brake fluid flows into the con-
tainer. This will release the tension on
the brake lever and will make it reach
the end of stroke.
•
Close the bleed valve before the lever
reaches its end of stroke.
•
Repeat the operation until the fluid
draining into the container is air-bubble
free.
NOTE
WHILE PURGING THE HYDRAULIC SYSTEM, FILL THE
RESERVOIR WITH THE NECESSARY QUANTITY OF
BRAKE FLUID. CHECK THAT, DURING THE OPERATION,
THERE IS ALWAYS BRAKE FLUID IN THE RESERVOIR.
•
Screw the bleeding valve and remove the pipe.
•
Top-up the reservoir until the correct brake fluid level is obtained.
•
Refit and block the front brake oil reservoir cap.
•
Refit the rubber protection cover.
Rear
Any air trapped in the hydraulic circuit acts as a cushion, absorbing much of the pressure applied by
the brake pump and minimising the braking power of the calliper.
The presence of air is signalled by the "sponginess" of the brake and by poor braking.
CAUTION
BRAK SYS - 302
RS 125 - Tuono 125 - Euro 4