Assembling The Rear Brake Caliper; Installing The Rear Brake Caliper - Yamaha YZ250 2022 Owner's Service Manual

2. Check:
• Brake caliper bracket
Crack/damage  Replace.
EAM30045

ASSEMBLING THE REAR BRAKE CALIPER

EWA19280
WARNING
• Before installation, clean and lubricate the
internal parts. Use new brake fluid for
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 4-7.
• Copper washer
New
• Brake hose
• Union bolt
Rear 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 b
3. Install:
• Brake pad spring
• Brake pad
• Brake pad pin
• Brake pad pin plug
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 3-14.
4. Pour brake fluid to the brake fluid reservoir up
to the specified level.
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.
5. Bleed:
• Brake system
Refer to "BLEEDING THE HYDRAULIC
BRAKE SYSTEM" on page 3-15.
4-29
REAR BRAKE
b b
a a