Checking The Brake Fluid Level; Adjusting The Rear Brake - Yamaha 2002 YZ250FR Assembly Manual

2. Bleed:
Dhydraulic brake system
a. Add the recommended brake fluid to the
proper level.
b. Install the brake master cylinder reser-
voir diaphragm.
c. Connect a clear plastic hose (1) tightly to
the bleed screw (2).
(A) Front brake
(B) Rear brake
d. Place the other end of the hose into a
container.
e. Slowly squeeze the brake lever several
times and release it.
f. Fully squeeze the brake lever and do not
release it.
g. Loosen the bleed screw. This will release
the tension and cause the brake lever to
contact the throttle grip.
h. Tighten the bleed screw and then
release the brake lever.
EAA01032
G. CHECKING THE BRAKE FLUID
LEVEL
1. Stand the machine on a level surface.
NOTE:
D Place the machine on a suitable stand.
D Make sure that the machine is upright.
2. Check:
Dbrake fluid level
Below the minimum level mark (a)>Add
the recommended brake fluid to the
proper level.
Recommended brake fluid
DOT 4
(A) Front brake
(B) Rear brake
EAA01028
H. ADJUSTING THE REAR BRAKE
1. Measure:
Dbrake pedal position
(distance (a) from the top of the rider
footrest to the top of the brake pedal)
Out of specification > Adjust.
Brake pedal position (above the top of
the rider footrest)
5 mm (0.20 in)
- 16 -
i. Repeat steps (e) to (h) until all of the air
bubbles have disappeared from the
brake fluid in the plastic hose.
j. Tighten the bleed screw to specification.
Bleed screw
6 Nm (0.6 mdkg, 4.3 ftdlb)
k. Fill the reservoir to the proper level.
Refer to "CHECKING THE BRAKE
FLUID LEVEL".
W
After bleeding the hydraulic brake sys-
tem, check the brake operation.
3. Install:
Ddiaphragm
Dprotector (rear brake)
W
D Use only designated brake fluid.
Other brake fluids may cause the rub-
ber seals to deteriorate, causing leak-
age and poor brake performance.
D Refill with the same type of brake fluid
that is already in the system. Mixing
brake fluids may result in a harmful
chemical reaction, leading to poor
brake performance.
D D When refilling, be careful that water
does not enter the reservoir. Water will
significantly lower the boiling point of
the brake fluid and could cause vapor
lock.
CAUTION:
Brake fluid may damage painted sur-
faces and plastic parts. Therefore, always
clean up any split brake fluid immediate-
ly.
NOTE:
In order to ensure a correct reading of the
brake fluid level, make sure that the top of
the reservoir is level.