Bleeding The Hydraulic Brake System (Abs) - Yamaha VMAX 2009 Service Manual

Direction "a"
Brake light comes on sooner.
Direction "b"
Brake light comes on later.
a
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EAS2S31012
BLEEDING THE HYDRAULIC BRAKE
SYSTEM (ABS)
EWA14000
WARNING
Always bleed the brake system when the
brake related parts are removed.
ECA2S31004
NOTICE
• Bleed the brake system in the following or-
der.
• 1st step: Front brake calipers
• 2nd step: Rear brake caliper
EWA2S31004
WARNING
Bleed the ABS whenever:
• the system is disassembled.
• a brake hose is loosened, disconnected or
replaced.
• the brake fluid level is very low.
• brake operation is faulty.
TIP
• Be careful not to spill any brake fluid or allow
the brake master cylinder reservoir or brake
fluid reservoir to overflow.
• When bleeding the ABS, make sure that there
is always enough brake fluid before applying
the brake. Ignoring this precaution could allow
air to enter the ABS, considerably lengthening
the bleeding procedure.
• 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
2
b
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1. Bleed:
• ABS
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a. Fill the brake master cylinder reservoir or
brake fluid reservoir to the proper level with
the recommended brake fluid.
b. Install the diaphragm (brake master cylinder
reservoir or brake fluid reservoir).
c. Connect a clear plastic hose "1" tightly to the
bleed screw "2".
A
LLL
B
1
A. Front brake caliper
B. Rear brake caliper
d. Place the other end of the hose into a con-
tainer.
e. Slowly apply the brake several times.
f. Fully squeeze the brake lever or fully depress
the brake pedal and hold it in position.
g. Loosen the bleed screw.
TIP
Loosening the bleed screw will release the pres-
sure and cause the brake lever to contact the
throttle grip or the brake pedal to fully extend.
h. Tighten the bleed screw and then release the
brake lever or brake pedal.
i. Repeat steps (e) to (h) until all of the air bub-
bles have disappeared from the brake fluid in
the plastic hose.
j. Check the operation of the hydraulic unit.
Refer to "HYDRAULIC UNIT OPERATION
TESTS" on page 4-59.
3-24
CHASSIS
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2
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1
2