Installing The Rear Brake Caliper; Removing The Rear Brake Master Cylinder - Yamaha WR450FN 2022 Owner's Service Manual

cleaning and lubricating.
• Never use solvents on internal brake com-
ponents as they will cause the piston seals
to swell and distort.
• When the brake caliper is disassembled, re-
place the brake caliper piston seal and the
brake caliper piston dust seal with new
ones.
Specified brake fluid
DOT 4
EAM30047

INSTALLING THE REAR BRAKE CALIPER

1. Install:
• Rear brake caliper
• Rear brake caliper bracket
2. Install:
• Rear wheel
Refer to "REAR WHEEL" on page 4-12.
• Copper washer
New
• Brake hose
• Union bolt
Brake hose union bolt
30 N·m (3.0 kgf·m, 22 lb·ft)
EWA13531
WARNING
Proper brake hose routing is essential to in-
sure safe vehicle operation.
ECA24490
NOTICE
Make sure that a bend in its pipe portion "a"
is directed as shown and the brake hose
touches the projection "b" on the brake cali-
per.
b
3. Install:
• Brake pad spring
• Brake pad
• Brake pad pin
• Brake pad pin plug
4. Pour brake fluid to the brake fluid reservoir up
EWA13090
• Use only the designated brake fluid. Other
• Refill with the same type of brake fluid that
• When refilling, be careful that water does
ECA13540
Brake fluid may damage painted surfaces
and plastic parts. Therefore, always clean up
any spilt brake fluid immediately.
5. Bleed:
6. Check:
b
7. Check:
a
EAM30048
REMOVING THE REAR BRAKE MASTER
CYLINDER
TIP
Before removing the rear brake master cylinder,
drain the brake fluid from the entire brake sys-
4-34
Brake pad pin
17 N·m (1.7 kgf·m, 13 lb·ft)
Brake pad pin plug
2.5 N·m (0.25 kgf·m, 1.8 lb·ft)
Refer to "CHECKING THE REAR BRAKE
PADS" on page 3-24.
to the specified level.
Specified brake fluid
DOT 4
WARNING
brake fluids may cause the rubber seals to
deteriorate, causing leakage and poor
brake performance.
is already in the system. Mixing brake fluids
may result in a harmful chemical reaction,
leading to poor brake performance.
not enter the brake fluid reservoir. Water
will significantly lower the boiling point of
the brake fluid and could cause vapor lock.
NOTICE
• Brake system
Refer to "BLEEDING THE HYDRAULIC
BRAKE SYSTEM" on page 3-25.
• Brake fluid level
The minimum level mark or below  Add.
Refer to "CHECKING THE BRAKE FLUID
LEVEL" on page 3-23.
• Brake pedal operation
A softy or spongy feeling  Bleed the brake
system.
Refer to "BLEEDING THE HYDRAULIC
BRAKE SYSTEM" on page 3-25.
REAR BRAKE