2001 YAMAHA TTR125 air bleeding

3 - 15
INSP
ADJ
EC360000
CHASSIS
EC361012
BRAKE SYSTEM AIR BLEEDING (TT-R125LW)
WARNING
Bleed the brake system if:
lThe system has been disassembled.
lA brake hose has been loosened or
removed.
lThe brake fluid is very low.
lThe brake operation is faulty.
A dangerous loss of braking performance
may occur if the brake system is not prop-
erly bleed.
1. Remove:
lBrake master cylinder cap
lDiaphragm
2. Bleed:
lBrake fluid
Air bleeding steps:
a. Add proper brake fluid to the reservoir.
b. Install the diaphragm. Be careful not to
spill any fluid or allow the reservoir to
overflow.
c. Connect the clear plastic tube 2 tightly
to the caliper bleed screw 1.
d. Place the other end of the tube into a
container.
e. Slowly apply the brake lever several
times.
f. Pull in the lever. Hold the lever in posi-
tion.
g. Loosen the bleed screw and allow the
lever to travel towards its limit.
h. Tighten the bleed screw when the lever
limit has been reached; then release the
lever.
T R..
Bleed screw:
6 Nm (0.6 m • kg, 4.3 ft • lb)
i. Repeat steps (e) to (h) until of the air
bubbles have been removed from the
system.
CHASSIS/BRAKE SYSTEM AIR BLEEDING (TT-R125LW)

3 - 19
INSP
ADJ
4. Inspect:
lBrake fluid level
Refer to “BRAKE FLUID LEVEL
INSPECTION” section in the CHAP-
TER 3.
5. Check:
lBrake lever operation
A softy or spongy feeling ® Bleed
brake system.
Refer to “BRAKE SYSTEM AIR
BLEEDING” section.
FRONT BRAKE SHOE INSPECTION (TT-R125)
1. Inspect:
lBrake shoe lining wear limit
lConnect the transparent hose 4 to the
bleed screw 5 and place the suitable con-
tainer under its end.
lLoosen the bleed screw and push the
brake caliper piston in.
CAUTION:
Do not reuse the drained brake fluid.
lTighten the bleed screw.
T R..
Bleed screw:
6 Nm (0.6 m • kg, 4.3 ft • lb)
lInstall the brake caliper 6 and brake cali-
per support bolt 7.
NOTE:
Apply the lithium soap base grease on the
caliper support bolt.
T R..
Brake caliper support bolt:
22 Nm (2.2 m • kg, 16 ft • lb)
Brake shoe lining wear limit checking
steps:
lFully pull in the brake lever and hold it in
position.
lThen check the brake shoe wear indicator
1 is within the wear limit a.
Outside the limit ® Replace the brake
shoe.
Refer to “FRONT WHEEL AND FRONT
BRAKE” section in the CHAPTER 5.
FRONT BRAKE SHOE INSPECTION (TT-R125)

5 - 22
CHAS

Brake fluid
1. Fill:
l
Brake fluid
Until the fluid level reaches “LOWER”
level line
a
.
WARNING

l
Use only the designated quality brake
fluid:
otherwise, the rubber seals may deterio-
rate, causing leakage and poor brake per-
formance.
l
Refill with the same type of brake fluid;
mixing fluids may result in a harmful chem-
ical reaction and lead to poor performance.
l
Be careful that water does not enter the
brake master cylinder when refilling.
Water will significantly lower the boiling
point of the fluid and may result in vapor
lock.
CAUTION:

Brake fluid may erode painted surfaces or
plastic parts. Always clean up spilled fluid
immediately.
Recommended brake fluid:
DOT #4
2. Air bleed:
l
Brake system
Refer to “BRAKE SYSTEM AIR
BLEEDING” section in the CHAPTER
3.
3. Inspect:
l
Brake fluid level
Fluid at lower level
®
Fill up.
Refer to “BRAKE FLUID LEVEL
INSPECTION” section in the CHAP-
TER 3.
FRONT BRAKE (TT-R125LW)