Yamaha YZF-R125 Service Manual: Installing the rear brake master cylinder

Yamaha YZF-R125 Service Manual / Chassis / Rear brake / Installing the rear brake master cylinder

1. Install:

  • Copper washers "1"

  • Brake hose "2"
  • Rear brake light switch "3"

WARNING

Proper brake hose routing is essential to insure safe vehicle operation. Refer to "CABLE ROUTING" on page 2-33.

CAUTION:

When installing the brake hose onto the brake master cylinder, make sure the brake pipe touches the projection "a" as shown.

Installing the rear brake master cylinder


2. Fill:

  • Brake fluid reservoir (with the specified amount of the recommended brake fluid)

WARNING
  • Use only the designated brake fluid. Other brake fluids may cause the rubber seals to deteriorate, causing leakage and poor brake performance.
  • Refill with the same type of brake fluid that is already in the system. Mixing brake fluids may result in a harmful chemical reaction, leading to poor brake performance.
  • When refilling, be careful that water does not enter the brake fluid reservoir. Water will significantly lower the boiling point of the brake fluid and could cause vapor lock.
CAUTION:

Brake fluid may damage painted surfaces and plastic parts. Therefore, always clean up any spilt brake fluid immediately.

3. Bleed:

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

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.

Installing the rear brake master cylinder


5. Check:

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

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

6. Adjust:

  • Brake pedal position Refer to "ADJUSTING THE REAR DISC BRAKE" on page 3-18.

    Assembling the rear 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. ...

    Handlebars
    ...

    Other materials:

    Checking the timing chain tensioner
    1. Check: Timing chain tensioner Cracks/damage/rough movement Replace. a. Lightly press the timing chain tensioner rod into the timing chain tensioner housing by hand. NOTE: While pressing the timing chain tensioner rod, wind it clockwise with a thin screwdriver "1" until it stops. b. ...

    Checking the brake fluid level
    Front brake Front brake Minimum level mark Rear brake Rear brake Minimum level mark Insufficient brake fluid may allow air to enter the brake system, possibly causing it to become ineffective. Before riding, check that the brake fluid is above the minimum level mark an ...

    Checking the cooling system
    1. Remove: Side covers Upper side cowlings Refer to "GENERAL CHASSIS" on page 4-1. 2. Check: Radiator "1" Radiator inlet hose "2" Radiator outlet hose "3" Coolant reservoir hose "4" Water pump breather hose "5" Cracks/damage → Replace. Refer to "RADIATOR" on page 6-1 ...

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