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
    WARNINGDisc brake components rarely require disassembly. Therefore, always follow these preventive measures: Never disassemble brake components unless absolutely necessa ...

    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:

    Checking the camshaft
    1. Check: Camshaft lobes Blue discoloration/pitting/scratches  Replace the camshaft. 2. Measure: Camshaft lobe dimensions "a" and "b" Out of specification Replace the camshaft. 3. Check: Camshaft oil passage Obstruction Blow out with compressed air. ...

    Checking the ignition coil
    1. Check: Primary coil resistance Out of specification  Replace. a. Disconnect the ignition coil connectors from the ignition coil terminals. b. Connect the pocket tester ( × 1) to the ignition coil as shown. Positive tester probe red/white "1" Negative tester probe orange ...

    Disassembling the rear brake caliper
    1. Remove: Brake caliper piston "1" Brake caliper piston dust seal "2" Brake caliper piston seal "3" a. Blow compressed air into the brake hose joint opening "a" to force out the piston from the brake caliper. WARNING Cover the brake caliper piston with a rag. Be careful no ...

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