Removing The Front Brake Master Cylinder; Checking The Front Brake Master Cylinder - Yamaha XT250X Service Manual

brake fluids may cause the rubber seals to
deteriorate, causing leakage and poor
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.
5. Bleed:
Brake system
G
Refer to "BLEEDING THE HYDRAULIC
BRAKE SYSTEM" on page 3-19.
6. Check:
Brake fluid level
G
Below the minimum level mark "a" → Add the
recommended brake fluid to the proper level.
Refer to "CHECKING THE BRAKE FLUID
LEVEL" on page 3-17.
7. Check:
Brake lever operation
G
Soft or spongy feeling → Bleed the brake
system.
Refer to "BLEEDING THE HYDRAULIC
BRAKE SYSTEM" on page 3-19.
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:
Front brake light switch "1"
G
(from the brake switch)
NOTE:
Remove the master cylinder by pressing the
projection.
2. Remove:
Union bolt
G
Copper washers
G
Front brake hose
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:
Front 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.
a
2. Check:
Brake master cylinder kit "1"
G
Damage/scratches/wear → Replace.
3. Check:
Brake master cylinder reservoir cap
G
Brake master cylinder reservoir diaphragm
G
holder
Brake master cylinder reservoir diaphragm
G
Cracks/damage → Replace.
4. Check:
4-21
FRONT BRAKE
1
2