Checking The Rear Brake Master Cylinder; Assembling The Rear Brake Master Cylinder; Installing The Rear Brake Master Cylinder - Yamaha XV19SX(C) Service Manual

EAS22720
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 master cylinder kit
Damage/scratches/wear → Replace.
3. Check:
• Brake fluid reservoir
Cracks/damage → Replace.
• Brake fluid reservoir diaphragm
Cracks/damage → Replace.
4. Check:
• Brake hoses
Cracks/damage/wear → Replace.
EAS22730
ASSEMBLING THE REAR BRAKE MASTER
CYLINDER
EWA13520
WARNING
• Before installation, all internal brake com-
ponents should be cleaned and lubricated
with clean or new brake fluid.
• Never use solvents on internal brake com-
ponents.
Recommended fluid
DOT 4
EAS22740
INSTALLING THE REAR BRAKE MASTER
CYLINDER
1. Install:
• Copper washers "1"
• Rear brake hose "2"
• Rear brake hose union bolt "3"
Rear brake hose union bolt
30 Nm (3.0 m·kg, 22 ft·lb)
EWA1D77008
WARNING
Proper brake hose routing is essential to in-
sure safe vehicle operation. Refer to "CABLE
ROUTING (for XV19S(C)/ XV19M(C)/
XV19CTS(C)/ XV19CTM(C))" on page 2-51
and "CABLE ROUTING (for XV19CS(C)/
XV19C(C))" on page 2-67.
New
EC1D71009
CAUTION:
When installing the brake hose onto the
brake master cylinder, make sure the brake
pipe touches the projection "a" on the brake
caliper bracket as shown.
a
2
2. Fill:
• Brake fluid reservoir
(with the specified amount of the recom-
mended brake fluid)
Recommended 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
CAUTION:
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" on page 3-24.
4. 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 3-21.
4-57
REAR BRAKE
New
1
3