Removing The Rear Brake Caliper; Disassembling The Rear Brake Caliper; Checking The Rear Brake Caliper - Yamaha YZ450FP 2023 Owner's Service Manual

4. Check:
• Brake fluid level
Refer to "CHECKING THE BRAKE FLUID
LEVEL" on page 3-24.
5. Check:
• Brake pedal operation
A softy or spongy feeling  Bleed the brake
system.
Refer to "BLEEDING THE HYDRAULIC
BRAKE SYSTEM" on page 3-26.
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"
1
2
3
a. Blow compressed air into the brake hose
8 8
9 9
4-34
joint opening to force out the piston from
the brake caliper.
EWA13550
WARNING
• 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.
3
EWA19270
WARNING
When the brake caliper is disassembled, re-
place the brake caliper piston seal and the
brake caliper piston dust seal with new ones.
REAR BRAKE
2
1