HYOSUNG Sense SD-50 Service Manual page 16

WARNING:
Brake fluid, if it leaks, will interfere with safe running and
immediatery discolor painted surfaces.
Check the brake hoses for cracks and hose joints for leak-
age before riding.
BRAKE PADS
Wearing condition of brake pads can be checked by observing the
limit line ① marked on the pad. When the wear exceeds the limit
mark, replace the pads with new ones.(Refer to page 6-13.)
BLEEDING AIR FROM THE BRAKE FLUID CIRCUIT
Air trapped in the fluid circuit acts like a cushion to absorb a large
proportion of the pressure developed by the master cylinder and
thus interferes with the full braking performance of the brake
caliper. The presence of air is indicated by "sponginess" of the
brake lever and also by lack of braking force. Considering the dan-
ger to which such trapped air exposes the machine and rider, it is
essectial that, after remounting the brake and restoring the brake
system to the normal condition, the brake fluid circuit be purged of
air in the following manner:
● Fill up the master cylinder reservoir to the upper end of the
inspection window. Replace the reservoir cap to prevent entry of
dirt.
● Attach a pipe to the caliper bleeder valve, and insert the free
end of the pipe into a receptacle.
● Bleed air from the bleeder valve.
● Squeeze and release the brake lever several times in rapid suc-
cession, and squeeze the lever fully without releasing it. Loosen
the bleeder valve by turning it a quarter of a turn so that the
brake fluid runs into the receptacle: this will remove the tension
of the brake lever causing it to touch the handlebar grip. Then,
close the valve, pump and squeeze the lever, and open the
valve. Repeat this process until the fluid flowing into the recep-
tacle no longer contains air bubbles.
PERIODIC MAINTENANCE AND TUNE-UP PROCEDURES 2-8
①