Yamaha SR400 2014 Service Manual

FRONT BRAKE4-22EAS22221INTRODUCTIONWARNINGEWA14101Disc brake components rarely require disas-sembly. Therefore, always follow these pre-ventive measures:• Never disassemble brake components un-less absolutely necessary.• If any connection on the hydraulic brakesystem is disconnected, the entire brakesystem must be disassembled, drained,cleaned, properly filled, and bled after reas-sembly.• Never use solvents on internal brake com-ponents.• Use only clean or new brake fluid for clean-ing brake components.• Brake fluid may damage painted surfacesand plastic parts. Therefore, always cleanup any spilt brake fluid immediately.• Avoid brake fluid coming into contact withthe eyes as it can cause serious injury.FIRST AID FOR BRAKE FLUID ENTERINGTHE EYES:• Flush with water for 15 minutes and get im-mediate medical attention.EAS22230CHECKING THE FRONT BRAKE DISC1. Remove:• Front wheelRefer to “FRONT WHEEL” on page 4-5.2. Check:• Brake discDamage/galling  Replace.3. Measure:• Brake disc runoutOut of specification  Correct the brake discrunout or replace the brake disc.▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼a. Place the vehicle on a suitable stand so thatthe front wheel is elevated.b. Before measuring the front brake disc runout,turn the handlebar to the left or right to ensurethat the front wheel is stationary.c. Remove the brake caliper.d. Hold the dial gauge at a right angle againstthe brake disc surface.e. Measure the runout 3.0 mm (0.12 in) belowthe edge of the brake disc.▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲4. Measure:• Brake disc thicknessMeasure the brake disc thickness at a few dif-ferent locations.Out of specification  Replace.5. Adjust:• Brake disc runout▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼a. Remove the brake disc.b. Rotate the brake disc by one bolt hole.c. Install the brake disc.TIPTighten the brake disc bolts in stages and in acrisscross pattern.Brake disc runout limit (as mea-sured on wheel)0.15 mm (0.0059 in)Brake disc thickness limit4.5 mm (0.18 in)