APRILIA RS 50 Workshop Manual page 58

Routine maintenance operations
RS 50
CAUTION
Given the potential danger to the motorcycle and
rider, it is absolutely essential to bleed the air
from the hydraulic circuit after refitting the brakes
and setting up the system for normal use condi-
tions.
To do this, proceed as follows:
2
Top up the reservoir with brake fluid see (CHECKING
AND TOPPING UP THE BRAKE FLUID).
Remove the protective rubber cap.
1
Fit one end of a transparent plastic tube over the
brake caliper bleed valve (1) and insert the other end
in a container to collect the fluid.
Pull and release the brake lever several times, then
keep it fully engaged.
Slacken the bleed valve 1/4 of a turn so that the brake
fluid runs into the container; this will take the tension
off the brake lever so that it pulls fully to its travel limit.
Tighten up the bleed valve (1), pump the brake lever a
few times, then keep it fully engaged and unscrew the
bleed screw again.
Keep repeating this operation until the fluid running
into the container is completely free of air bubbles.
NOTE
Top up the reservoir with brake fluid whenever
necessary when bleeding the hydraulic system. Keep
checkingto ensure that there is brake fluid in the
reservoir throughout the entire operation.
1
Tighten up the bleed valve and disconnect the tube.
Top up the reservoir to the correct level with brake
fluid see (CHECKING AND TOPPING UP THE
BRAKE FLUID).
Refit the protective rubber cap.
2-29
ch. 2
Release 00 2001-03