Bleeding The Hydraulic Brake System - Yamaha YZF-R1S Service Manual

BLEEDING THE HYDRAULIC BRAKE SYSTEM

A
B
C
EAS00135
BLEEDING THE HYDRAULIC BRAKE
SYSTEM
WARNING
Bleed the hydraulic brake system whenev-
er:
S the system is disassembled.
S a brake hose is loosened, disconnected or
replaced.
S the brake fluid level is very low.
S brake operation is faulty.
NOTE:
S Be careful not to spill any brake fluid or allow
the brake fluid reservoir to overflow.
S When bleeding the hydraulic brake system,
make sure there is always enough brake fluid
before applying the brake. Ignoring this pre-
caution could allow air to enter the hydraulic
brake system, considerably lengthening the
bleeding procedure.
S If bleeding is difficult, it may be necessary to let
the brake fluid settle for a few hours. Repeat
the bleeding procedure when the tiny bubbles
in the hose have disappeared.
1. Bleed:
S hydraulic brake system
a. Fill the brake fluid reservoir to the proper lev-
el with the recommended brake fluid.
b. Install the brake fluid reservoir diaphragm.
c. Connect a clear plastic hose 1 tightly to the
bleed screw 2 .
A Front brake master cylinder
B Front brake caliper
C Rear brake caliper
NOTE:
Bleeding order of the front hydraulic brake sys-
tem is the following order:
1. front brake master cylinder.
2. front brake calipers.
3. front brake master cylinder.
d. Place the other end of the hose into a con-
tainer.
e. Slowly apply the brake several times.
f. Fully pull the brake lever or fully press down
the brake pedal and hold it in position.
g. Loosen the bleed screw.
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CHK
ADJ