Checking The Front Brake Fluid Level; Changing The Brake Fluid - Yamaha YBR250 Owner's Manual

PERIODIC MAINTENANCE AND MINOR REPAIR
Checking the front brake
fluid level
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1. Minimum level mark
Insufficient brake fluid may allow air to
enter the brake system, possibly
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causing it to become ineffective.
Before riding, check that the brake fluid
is above the minimum level mark and
replenish if necessary. A low brake fluid
level may indicate worn brake pads and/
or brake system leakage. If the brake
fluid level is low, be sure to check the
brake pads for wear and the brake
system for leakage.
Observe these precautions:
When checking the fluid level, make
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sure that the top of the master
cylinder is level by turning the
handlebars.
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Use only the recommended quality
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brake fluid, otherwise the rubber
seals may deteriorate, causing
leakage and
performance.
Recommended brake fluid:
DOT 4
If DOT 4 is not available, DOT 3 can be
used.
Refill with the same type of brake
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fluid. Mixing fluids may result in a
harmful chemical reaction and lead
to poor braking performance.
Be careful that water does not enter
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the master cylinder when refilling.
Water will significantly lower the
boiling point of the fluid and may
result in vapor lock.
Brake fluid may deteriorate painted
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surfaces or plastic parts. Always
clean up spilled fluid immediately.
As the brake pads wear, it is normal
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for the brake fluid level to gradually
go down. However, if the brake fluid
level goes down suddenly, have a
Yamaha dealer check the cause.

Changing the brake fluid

Have a Yamaha dealer change the brake
fluid at the intervals specified in the
poor braking
NOTE after the periodic maintenance
and lubrication chart. In addition, have
the oil seals of the brake master cylinder
and caliper as well as the brake hose
replaced at the intervals listed below or
whenever they are damaged or leaking.
6 - 1 8
Oil seals: Replace every two years.
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Brake hose: Replace every four
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years.
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