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

Yamaha YZF-R125 Service Manual / Periodic checks and adjustments / Chassis / 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

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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:

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1. Check: Turn signal relay input voltage Out of specification →The wiring circuit from the main switch to the turn signal relay coupler is faulty and must be repaired. a. Connect the pocket tester (DC 20 V) to the turn signal relay terminal as shown. - Positive tester probe b ...

Installing the rear shock absorber assembly
1. Install: Rear shock absorber assembly Relay arm "1" NOTE: Install the relay arm as shown in the illustration. 2. Tighten: Rear shock absorber assembly upper nut Relay arm nut Rear shock absorber assembly lower nut 3. Install: Connecting arms NOTE: When ins ...

Installing the rear wheel (disc)
1. Install: Rear brake disc NOTE: Tighten the brake disc bolts in stages and in a crisscross pattern. 2. Check: Rear brake disc Refer to "CHECKING THE REAR BRAKE DISC" on page 4-33. 3. Lubricate: Rear wheel axle Contact surface of rear wheel hub and rear wheel Whee ...