Yamaha YZF-R125 Service Manual: Checking the front brake master cylinder

Yamaha YZF-R125 Service Manual / Chassis / Front brake / Checking the front 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 reservoir Cracks/damage Replace the brake
    master cylinder.
  • Brake master cylinder reservoir diaphragm Damage/wear Replace.

3. Check:

  • Brake hose Cracks/damage/wear Replace.

Assembling the front brake master cylinder

WARNING
  • Before installation, all internal brake components should be cleaned and lubricated with clean or new brake fluid.
  • Never use solvents on internal brake components.
    Removing the front brake master cylinder
    NOTE: Before removing the front brake master cylinder, drain the brake fluid from the entire brake system. 1. Disconnect: Front brake light switch 2. Remove: Brake hose union bolt Copp ...

    Installing the front brake master cylinder
    1. Install: Brake master cylinder "1" Brake master cylinder holder "2" NOTE: Install the brake master cylinder holder with the arrow mark "a" pointing forward. Align the end of the br ...

    Other materials:

    Adjusting the throttle cable free play
    Throttle cable free play The throttle cable free play should measure 3.0-5.0 mm (0.12-0.20 in) at the throttle grip. Periodically check the throttle cable free play and, if necessary, adjust it as follows. TIP The engine idling speed must be correctly adjusted before checkin ...

    Electrical components
    1. Main switch 2. Clutch switch 3. Front brake light switch 4. Ignition coil 5. Throttle body sensor assembly (intake air pressure sensor, intake air temperature sensor, throttle position sensor) 6. FID (fast idle solenoid) 7. Rectifier/regulator 8. Lean angle sensor 9. Starting circui ...

    Measuring the compression pressure
    NOTE: Insufficient compression pressure will result in a loss of performance. 1. Measure: Valve clearance Out of specification →Adjust. Refer to "ADJUSTING THE VALVE CLEARANCE" on page 3-3. 2. Start the engine, warm it up for several minutes, and then turn it off. 3. Remove: ...

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