Yamaha YZF-R125 Service Manual: Replacing the front brake pads

Yamaha YZF-R125 Service Manual / Chassis / Front brake / 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
    the brake pads as a set.


2. Install:

  • Brake pad support

  • Brake pad spring

  • Brake pads

NOTE:

Always install new brake pads, a new brake pad spring and a new brake pad support as a set.

a. Connect a clear plastic hose "1" tightly to the bleed screw "2". Put the other end of the hose into an open container.

Replacing the front brake pads


b. Loosen the bleed screw and push the brake caliper pistons into the brake caliper with your fingers.

c. Tighten the bleed screw.


d. Install new brake pad support, a new brake pad spring and new brake pads.

NOTE:

The arrow mark "a" on the brake pad spring must point in the direction of disc rotation.

Replacing the front brake pads


3. Install:

  • Brake pad pin
  • Brake pad clips
  • Front brake caliper

4. Check:

  • Brake fluid level Below the minimum level mark "a" → Add the recommended brake fluid to the proper level.

    Refer to "CHECKING THE BRAKE FLUID LEVEL" on page 3-18.

Replacing the front brake pads


5. Check:

  • Brake lever operation Soft or spongy feeling Bleed
    the brake system.

    Refer to "BLEEDING THE HYDRAULIC BRAKE SYSTEM" on page 3-20.

    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 b ...

    Removing the front brake caliper
    NOTE: Before disassembling the brake caliper, drain the brake fluid from the entire brake system. 1. Remove: Brake hose union bolt "1" Copper washers "2" Brake hose "3" NOTE: Put the en ...

    Other materials:

    Faulty front fork legs
    Leaking oil - Bent, damaged or rusty inner tube - Cracked or damaged outer tube - Improperly installed oil seal - Damaged oil seal lip - Incorrect oil level (high) - Loose damper rod assembly bolt - Damaged damper rod assembly bolt copper washer - Cracked or damaged front fork cap O-ring M ...

    Intake air temperature sensor
    1. Check: Intake air temperature sensor resistance Out of specification Replace the throttle body. a. Connect the pocket tester ( × 1k) to the throttle body sensor assembly coupler as shown. Positive tester probe brown/white "1" Negative tester probe gray/black ...

    Checking and charging the battery
    WARNINGBatteries generate explosive hydrogen gas and contain electrolyte which is made of poisonous and highly caustic sulfuric acid. Therefore, always follow these preventive measures: Wear protective eye gear when handling or working near batteries. Charge batt ...

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