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Yamaha YP125R Service Manual

Yamaha YP125R
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REAR BRAKE
4-43
WARNING
EWA13540
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 reser-
voir. Water will significantly lower the boil-
ing point of the brake fluid and could cause
vapor lock.
NOTICE
ECA13540
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 3-36.
6. Check:
Brake fluid level
Below the minimum level mark a Add the
recommended brake fluid to the proper level.
Refer to CHECKING THE BRAKE FLUID
LEVEL on page 3-35.
7. Check:
Brake lever operation
Soft or spongy feeling Bleed the brake sys-
tem.
Refer to BLEEDING THE HYDRAULIC
BRAKE SYSTEM on page 3-36.
EAS22700
REMOVING THE REAR BRAKE MASTER
CYLINDER
T
IP
Before removing the rear brake master cylinder,
drain the brake fluid from the entire brake sys-
tem.
1. Remove:
Brake hose union bolt 1
Copper washers 2
Brake hose 3
T
IP
To collect any remaining brake fluid, place a
container under the master cylinder and the end
of the brake hose.
EAS22710
CHECKING THE REAR BRAKE MASTER
CYLINDER
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:
Brake master cylinder kit
Damage/scratches/wear Replace.
3. Check:
Brake master cylinder reservoir cap
Brake master cylinder reservoir diaphragm
holder
Brake master cylinder reservoir diaphragm
Damage/wear Replace.
4. Check:
Rear brake hose
Cracks/damage/wear Replace.
MIN
MIN
a
13
2

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Yamaha YP125R Specifications

General IconGeneral
Engine TypeLiquid-cooled, 4-stroke, SOHC, 4-valve
Bore x Stroke52.4 mm x 57.9 mm
Fuel SystemFuel Injection
Ignition SystemTCI
TransmissionV-Belt Automatic
Front SuspensionTelescopic fork
Rear SuspensionUnit Swing
Front BrakeHydraulic single disc, Ø267 mm
Starter SystemElectric
Rear Tyre140/70-14M/C 62P (Tubeless)

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