Yamaha YZF-R125 Service Manual: Installing the front brake master cylinder
1. Install:
- Brake master cylinder "1"
- Brake master cylinder holder "2"

NOTE:
- Install the brake master cylinder holder with the
arrow mark "a" pointing forward.
- Align the end of the brake master cylinder holder
with the punch mark "b" on the handlebar.
- First, tighten the front bolt, then the rear bolt.


2. Install:
- Copper washers "1"

- Brake hose "2"
- Brake hose union bolt "3"
- Front brake light switch

WARNING Proper brake hose routing is essential to
insure
safe vehicle operation. Refer to "CABLE
ROUTING" on page 2-33. |
NOTE:
- Install the brake hose at an 101 angle to the
front brake master cylinder as shown in the illustration.
- While holding the brake hose, tighten the brake
hose union bolt as shown.
- Turn the handlebar to the left and right to make
sure the brake hose does not touch other parts
(e.g., wire harness, cables, leads). Correct if
necessary.

3. Install:
NOTE:
Before fully installing the front brake light switch,
be sure to completely install the rubber cover
over the switch. Also, be sure not to twist the
front brake light switch lead when screwing in
the switch.
4. Fill:
- Brake master cylinder reservoir
(with the specified amount of the recommended
brake fluid)

WARNING
- Use only the designated brake fluid. Other
brake fluids may cause the rubber seals to
deteriorate, causing leakage and poor
brake performance.
- 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
- When refilling, be careful that water does
not enter the brake master cylinder reservoir.
Water will significantly lower the boiling
point of the brake fluid and could cause
vapor lock.
|
CAUTION: Brake fluid may damage painted surfaces
and plastic parts. Therefore, always clean up
any spilt brake fluid immediately. |
5. Bleed:
- Brake system
Refer to "BLEEDING THE HYDRAULIC
BRAKE SYSTEM" on page 3-20.
6. Check:

7. Check:
Brake lever operation
Soft or spongy feeling → Bleed the brake
system.
Refer to "BLEEDING THE HYDRAULIC
BRAKE SYSTEM" on page 3-20.
1. Check:
Brake master cylinder
Damage/scratches/wear Replace.
Brake fluid delivery passages
(brake master cylinder body)
Obstruction Blow out with
compressed air.
2. Check:
Br ...
Other materials:
Installing the throttle body
1. Install:
Throttle body joint clamps
NOTE:
Align the projections "a" on the throttle body joint
with the slot "b" in each throttle body joint clamp.
2. Install:
Throttle body joint
NOTE:
Align the projection "a" on the throttle body joint
with the slot "b" in the intake mani ...
Checking the rear wheel
1. Check:
Rear wheel axle
Rear wheel
Wheel bearings
Oil seals
Refer to "CHECKING THE FRONT WHEEL"
on page 4-8.
2. Check:
Tire
Rear wheel
Damage/wear → Replace.
Refer to "CHECKING THE TIRES" on page
3-23 and "CHECKING THE WHEELS" on
page 3-25.
3. Measure:
Radi ...
Engine specifications
...
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