Air Bleeding (Hydraulic Brake System) - Yamaha RS90GTZ Service Manual

AIR BLEEDING (HYDRAULIC BRAKE SYSTEM)

AIR BLEEDING (HYDRAULIC BRAKE
SYSTEM)
WARNING
Bleed the brake system in the following
cases:
• The system has been disassembled.
• A brake hose is loosened or removed.
• The brake fluid has been very low.
• Brake operation is faulty.
If the brake system is not properly bled a
loss of braking performance may occur.
1. Remove:
• Side cover (right)
Refer to "COWLINGS" in CHAPTER 3.
2. Bleed:
• Brake system
Air bleeding steps:
a. Fill the brake master cylinder reservoir with
the proper brake fluid.
b. Install the diaphragm. Be careful not to spill
any fluid or allow the brake master cylinder
reservoir to overflow.
c. Connect clear plastic hoses
brake caliper bleed screws
d. Place the other end of the hoses in a con-
tainer.
e. Slowly apply the brake lever several times.
f. Pull the lever in, then hold the lever in posi-
tion.
g. Loosen the bleed screws and allow the
brake lever to travel towards its limit.
h. Tighten the bleed screws when the brake
lever limit has been reached, then release
the lever.
i. Repeat steps (e) to (h) until all of the air
bubbles have disappeared from the fluid.
j. Tighten the bleed screws.
Bleed screw:
6 Nm (0.6 m•kgf, 4.3 ft•lbf)
TIP
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 system have disappeared.
2-39
INSP
ADJ
tightly to the
.