Yamaha YZ250 2022, Owner'S Service Manual

Page: 122 / 274

REAR BRAKE
4-28
4. Check:
• Brake fluid level
Refer to “CHECKING THE BRAKE FLUID
LEVEL” on page 3-14.
5. Check:
• Brake pedal operation
A softy or spongy feeling

Bleed the brake
system.
Refer to “BLEEDING THE HYDRAULIC
BRAKE SYSTEM” on page 3-15.
EAM30042
REMOVING THE REAR BRAKE CALIPER
TIP
Before disassembling the brake caliper, drain
the brake fluid from the entire brake system.
1. Remove:
• Union bolt
•
Copper washer
• Brake hose
TIP
Put the end of the brake hose into a container
and pump out the brake fluid.
EAM30043
DISASSEMBLING THE REAR BRAKE
CALIPER
1. Remove:
•
Brake caliper piston “1”
• Brake caliper piston dust seal “2”
•
Brake caliper piston seal “3”
a. Blow compressed air into the brake hose
joint opening to force out the piston from
the brake caliper.
WARNING
EWA13550
• Cover the brake caliper piston with a rag.
Be careful not to get injured when the pis-
ton is expelled from the brake caliper.
• Never try to pry out the brake caliper pis-
ton.
b. Remove the brake caliper piston dust seal
and the brake caliper piston seal.
EAM30044
CHECKING THE REAR BRAKE CALIPER
1. Check:
•
Brake caliper piston “1”
Rust/scratches/wear

Replace the brake
caliper piston.
• Brake caliper cylinder “2”
Scratches/wear

Replace the brake caliper
assembly.
•
Brake caliper body “3”
Cracks/damage

Replace the brake caliper
assembly.
• Brake fluid delivery passages
(brake caliper body)
Obstruction

Blow out with compressed air.
WARNING
EWA19270
When the brake caliper is disassembled, re-
place the brake caliper piston seal and the
brake caliper piston dust seal with new ones.
9 9
8 8
2
3
1
1
2
3