Removing The Front Brake Master Cylinder; Checking The Front Brake Master Cylinder - Yamaha WR250R Service Manual
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Also See for WR250R:
- Owner's manual (100 pages) ,
- Owner's manual (112 pages) ,
- Owner's manual (98 pages)
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brake performance.
Refill with the same type of brake fluid that
G
is already in the system. Mixing brake flu-
ids may result in a harmful chemical reac-
tion, leading to poor brake performance.
When refilling, be careful that water does
G
not enter the brake fluid reservoir. Water
will significantly lower the boiling point of
the brake fluid and could cause vapor lock.
ECA13540
CAUTION:
Brake fluid may damage painted surfaces
and plastic parts. Therefore, always clean up
any spilt brake fluid immediately.
4. Bleed:
Brake system
G
Refer to "BLEEDING THE HYDRAULIC
BRAKE SYSTEM" on page 1-25.
5. Check:
Brake fluid level
G
Below the minimum level mark → Add the
recommended brake fluid to the proper level.
Refer to "CHECKING THE BRAKE FLUID
LEVEL" on page 1-23.
6. Check:
Brake lever free play
G
Refer to "ADJUSTING THE FRONT DISC
BRAKE" on page 1-22.
Brake lever operation
G
Soft or spongy feeling → Bleed the brake
system.
Refer to "BLEEDING THE HYDRAULIC
BRAKE SYSTEM" on page 1-25.
EAS22490
REMOVING THE FRONT BRAKE MASTER
CYLINDER
NOTE:
Before removing the front brake master cylinder,
drain the brake fluid from the entire brake sys-
tem.
1. Disconnect:
Brake switch coupler "1"
G
(from the brake master cylinder)
2. Remove:
Union bolt
G
Copper washers
G
Brake hoses
G
NOTE:
To collect any remaining brake fluid, place a
container under the master cylinder and the end
of the brake hose.
EAS22500
CHECKING THE FRONT BRAKE MASTER
CYLINDER
1. Check:
Brake master cylinder "1"
G
Damage/scratches/wear → Replace.
Brake fluid delivery passages "2"
G
(brake master cylinder body)
Obstruction → Blow out with compressed air.
2. Check:
Brake master cylinder kit
G
Damage/scratches/wear → Replace.
3. Check:
Brake master cylinder reservoir cap
G
4. Check:
Brake master cylinder reservoir diaphragm
G
holder
Brake master cylinder reservoir diaphragm
G
holder
Cracks/damage → Replace.
5. Check:
Brake hoses
G
Cracks/damage/wear → Replace.
4-20
FRONT BRAKE
1
2
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