Yamaha YZF-R125 Service Manual: Checking the front brake disc

Yamaha YZF-R125 Service Manual / Chassis / Front brake / Checking the front brake disc

1. Remove:

  • Front wheel Refer to "FRONT WHEEL" on page 4-6.

2. Check:

  • Brake disc Damage/galling Replace.

3. Measure:

  • Brake disc deflection Out of specification Correct the
    brake disc deflection or replace the brake disc.


a. Place the vehicle on a suitable stand so that the front wheel is elevated.

b. Before measuring the front brake disc deflection, turn the handlebar to the left or right to ensure that the front wheel is stationary.

c. Remove the brake caliper.

d. Hold the dial gauge at a right angle against the brake disc surface.

e. Measure the deflection 1.5 mm (0.06 in) below the edge of the brake disc.

4. Measure:

  • Brake disc thickness Measure the brake disc thickness at a few different locations.

    Out of specification Replace.


Checking the front brake disc



5. Adjust:

  • Brake disc deflection

a. Remove the brake disc.

b. Rotate the brake disc by one bolt hole.

c. Install the brake disc.


NOTE:

Tighten the brake disc bolts in stages and in a crisscross pattern.

Checking the front brake disc


d. Measure the brake disc deflection.

e. If out of specification, repeat the adjustment steps until the brake disc deflection is within specification.

f. If the brake disc deflection cannot be brought within specification, replace the brake disc.

6. Install:

  • Front wheel Refer to "FRONT WHEEL" on page 4-6.
    Introduction
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    Replacing the front brake pads
    NOTE: When replacing the brake pads, it is not necessary to disconnect the brake hose or disassemble the brake caliper. 1. Measure: Brake pad wear limit "a" Out of specification Replace ...

    Other materials:

    Operation and important riding points
    Read the Owner's Manual carefully to become familiar with all controls. If there is a control or function you do not understand, ask your Yamaha dealer. WARNING Failure to familiarize yourself with the controls can lead to loss of control, which could cause an accident or injury. TIP ...

    Circuit diagram
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