Checking The Rear Brake Master Cylinder; The Rear Brake Master Cylinder; Installing The Rear Brake Master Cylinder - Yamaha YZF-R1 Series Service Manual

EAS30194
CHECKING THE REAR BRAKE MASTER
CYLINDER
1. Check:
• Brake master cylinder
Damage/scratches/wear → Replace.
• Brake fluid delivery passages
(brake master cylinder body)
Obstruction → Blow out with compressed air.
2. Check:
• Brake fluid reservoir
• Brake fluid reservoir diaphragm holder
Cracks/damage → Replace.
• Brake fluid reservoir diaphragm
Damage/wear → Replace.
3. Check:
• Brake hose
• Brake fluid reservoir hose
Cracks/damage/wear → Replace.
EAS31743

THE REAR BRAKE MASTER CYLINDER

ECA23000
NOTICE
Do not disassemble the rear brake master
cylinder. If the master cylinder malfunctions,
replace the rear brake master cylinder as-
sembly.
EAS30196
INSTALLING THE REAR BRAKE MASTER
CYLINDER
1. Install:
• Brake hose gaskets
• Brake hose
• Brake fluid reservoir hose
• Brake hose union bolt
Rear brake hose union bolt
32 N·m (3.2 kgf·m, 24 lb·ft)
EWA13531
WARNING
Proper brake hose routing is essential to in-
sure safe vehicle operation.
ECA14160
NOTICE
When installing the brake hose onto the
brake master cylinder, make sure the brake
pipe touches the projection "a" as shown.
New
2. Fill:
• Brake fluid reservoir
(with the specified amount of the specified
brake fluid)
Specified brake fluid
DOT 4
EWA13090
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 fluid reservoir. Water
will significantly lower the boiling 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.
3. Bleed:
• Brake system
Refer to "BLEEDING THE HYDRAULIC
BRAKE SYSTEM (ABS)" on page 3-16.
4. Check:
• Brake fluid level
Below the minimum level mark "a" → Add the
specified brake fluid to the proper level.
Refer to "CHECKING THE BRAKE FLUID
LEVEL" on page 3-13.
5. Adjust:
• Brake pedal position
Refer to "ADJUSTING THE REAR DISC
BRAKE" on page 3-14.
4-72
REAR BRAKE
a