Yamaha YZF-R125 Service Manual: Adjusting the rear disc brake

1. Check:

  • Brake pedal position (distance "a" from the center of the rider footrest to the center of the brake pedal) Out of specification Adjust.

Adjusting the rear disc brake


2. Adjust:

  • Brake pedal position

a. Loosen the locknut "1".

b. Remove the cotter pin "2", washer "3", and pin "4".

c. Turn the adjusting nut "5" in direction "a" or "b" until the specified brake pedal position is obtained.


Adjusting the rear disc brake


d. Tighten the locknut "1" to specification.


WARNING

A soft or spongy feeling in the brake pedal can indicate the presence of air in the brake system. Before the vehicle is operated, the air must be removed by bleeding the brake system. Air in the brake system will considerably reduce braking performance.

CAUTION:

After adjusting the brake pedal position, make sure there is no brake drag.

e. Install the pin, washer, and cotter pin.

WARNING

Always use a new cotter pin.

    Chassis
    ...

    Checking the brake fluid level
    1. Stand the vehicle on a level surface. NOTE: Place the vehicle on a suitable stand. Make sure the vehicle is upright. 2. Check: Brake fluid level Below the minimum level mark "a" → ...

    Other materials:

    Checking the piston pin
    1. Check: Piston pin Blue discoloration/grooves  Replace the piston pin and then check the lubrication system. 2. Measure: Piston pin outside diameter "a" Out of specification Replace the piston pin. 3. Measure: Piston pin bore diameter "b" Out of specifica ...

    Checking the rocker arms and rocker arm shafts
    The following procedure applies to all of the rocker arms and rocker arm shafts. 1. Check: Rocker arm Damage/wear Replace. 2. Check: Rocker arm shaft Blue discoloration/excessive wear/pitting/ scratches  Replace or check the lubrication system. 3. Measure: Rocke ...

    Tachometer
    Tachometer Tachometer Tachometer red zone The electric tachometer allows the rider to monitor the engine speed and keep it within the ideal power range. When the key is turned to "ON", the tachometer needle will sweep once across the r/min range and then return to zero r/min ...

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