Removing The Front Brake Caliper; Disassembling The Front Brake Caliper; Checking The Front Brake Caliper - Yamaha YZ125X 2021 Owner's Service Manual

f. Install the pad pin plug "6".
Brake pad pin plug
2.5 N·m (0.25 kgf·m, 1.8 lb·ft)
4. Check:
• Brake fluid level
Refer to "CHECKING THE BRAKE FLUID
LEVEL" on page 3-14.
5. Check:
• Brake lever operation
A softy or spongy feeling  Bleed the brake
system.
Refer to "BLEEDING THE HYDRAULIC
BRAKE SYSTEM" on page 3-15.
EAM30030

REMOVING THE FRONT 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.
EAM30031
DISASSEMBLING THE FRONT BRAKE
CALIPER
1. Remove:
• Brake caliper piston "1"
4
• Brake caliper piston dust seal "2"
• Brake caliper piston seal "3"
5
a. Blow compressed air into the brake hose
EWA13550
• Cover the brake caliper piston with a rag.
6
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
EAM30032

CHECKING THE FRONT 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
4-17
FRONT BRAKE
1
3
2
joint opening to force out the piston from
the brake caliper.
WARNING
and the brake caliper piston seal.