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Yamaha WR250F 2021 - Removing the Front Brake Master Cylinder; Checking the Front Brake Master Cylinder; Assembling the Front Brake Master Cylinder

Yamaha WR250F 2021
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FRONT BRAKE
4-24
Refer to “BLEEDING THE HYDRAULIC
BRAKE SYSTEM” on page 3-25.
6. Check:
Brake fluid level
The minimum level mark or below Add.
Refer to “CHECKING THE BRAKE FLUID
LEVEL” on page 3-24.
7. Check:
Brake lever operation
A softy or spongy feeling Bleed the brake
system.
Refer to “BLEEDING THE HYDRAULIC
BRAKE SYSTEM” on page 3-25.
EAM30036
REMOVING THE FRONT BRAKE MASTER
CYLINDER
TIP
Before removing the front brake master cylinder,
drain the brake fluid from the entire brake sys-
tem.
1. Remove:
Union bolt
Copper washer
Brake hose
TIP
To drain any remaining brake fluid, place a con-
tainer under the master cylinder and the end of
the brake hose.
EAM30037
CHECKING THE FRONT BRAKE MASTER
CYLINDER
1. Check:
Brake master cylinder “1”
Damage/scratches/wear Replace.
Brake fluid delivery passages “2”
(brake master cylinder body)
Obstruction Blow out with compressed air.
2. Check:
Brake master cylinder kit
Damage/scratches/wear Replace.
3. Check:
Brake master cylinder reservoir cap
4. Check:
Brake hose
Cracks/damage/wear Replace.
EAM30038
ASSEMBLING THE FRONT BRAKE MASTER
CYLINDER
WARNING
EWA13520
Before installation, all internal brake com-
ponents should be cleaned and lubricated
with clean or new brake fluid.
Never use solvents on internal brake com-
ponents.
1. Wash the brake master cylinder and the
brake master cylinder kit with brake fluid.
2. Install:
Primary cylinder cup “1”
Secondary cylinder cup “2”
(to the brake master cylinder piston “3”)
WARNING
EWA20240
Apply brake fluid to the cylinder cups and in-
stall them as shown. Wrong orientation in in-
stallation causes poor braking performance.
3. Install:
Spring “1”
1
2
Specified brake fluid
DOT 4
12
3
21
3

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