HYOSUNG Prima Service Manual page 23

2-9 MAINTENANCE PROCEDURE
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.
BRAKE LAMP SWITCH
For the brake lamp come on after the brake lever is
pulled, adjust the brake lamp switch.
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 brak-
ing 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 danger to
which such trapped air exposes the machine and rider,
it is essential 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 man-
ner:
● 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.
Bleeder valve : 6~9 N∙m (0.6~0.9 kg∙m)
● Bleed air from the bleeder valve.
● Squeeze and release the brake lever several times in
rapid succession, 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 receptacle no longer contains air bub-
bles.
CAUTION
Replenish the brake fluid reservoir as necessary
while bleeding the brake system.
Make sure that there is always some fluid visible
in the reservoir.
● Close the bleeder valve, and disconnect the pipe. Fill
the reservoir to the upper end of the inspection win-
dow.
①
Do original position
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