Removing The Front Brake Master Cylinder; Checking The Front Brake Master Cylinder; Installing The Front Brake Master Cylinder - Yamaha WR125R 2009 Service Manual

EWA13540
WARNING
• Use only the designated brake fluid. Other
brake fluids may cause the rubber seals to
deteriorate, causing leakage and poor
brake performance.
• Refill with the same type of brake fluid that
is already in the system. Mixing brake fluids
may result in a harmful chemical reaction,
leading to poor brake performance.
• When refilling, be careful that water does
not enter the brake master cylinder reser-
voir. Water will significantly lower the boil-
ing point of the brake fluid and could cause
vapor lock.
ECA13540
NOTICE
Brake fluid may damage painted surfaces
and plastic parts. Therefore, always clean up
any spilt brake fluid immediately.
5. Bleed:
• Brake system
Refer to "BLEEDING THE HYDRAULIC
BRAKE SYSTEM" on page 3-19.
6. Check:
• Brake fluid level
Below the minimum level mark "a" → Add the
recommended brake fluid to the proper level.
Refer to "CHECKING THE BRAKE FLUID
LEVEL" on page 3-17.
7. Check:
• Brake lever operation
Soft or spongy feeling → Bleed the brake sys-
tem.
Refer to "BLEEDING THE HYDRAULIC
BRAKE SYSTEM" on page 3-19.
EAS22490
REMOVING THE FRONT BRAKE MASTER
CYLINDER
TIP
Before removing the front brake master cylinder,
drain the brake fluid from the entire brake sys-
tem.
1. Remove:
TIP
The front brake light switch is a screw-type
switch. Unscrew the switch to remove it from the
brake master cylinder.
2. Remove:
TIP
To collect any remaining brake fluid, place a
container under the master cylinder and the end
of the brake hose.
EAS22500
CHECKING THE FRONT BRAKE MASTER
CYLINDER
1. Check:
2. Check:
a
3. Check:
EAS22530
INSTALLING THE FRONT BRAKE MASTER
CYLINDER
1. Install:
4-27
• Front brake light switch
• Brake hose union bolt
• Copper washers
• Front brake hose
• Brake master cylinder
Damage/scratches/wear → Replace.
• Brake fluid delivery passages
(brake master cylinder body)
Obstruction → Blow out with compressed air.
• Brake master cylinder reservoir
Cracks/damage → Replace.
• Brake master cylinder reservoir diaphragm
Damage/wear → Replace.
• Brake hose
Cracks/damage/wear → Replace.
• Front brake master cylinder "1"
• Front brake master cylinder holder "2"
Front brake master cylinder hold-
er bolt
9 Nm (0.9 m·kgf, 6.5 ft·lbf)
FRONT BRAKE