Yamaha YZ250X 2022 Owner's Service Manual

FRONT BRAKE4-15EAM30028INTRODUCTIONWARNINGEWA19210If you need to disassemble the disc brakecomponents, observe the following precau-tions.• Never disassemble the brake componentsunless absolutely necessary.• If there is any problem with connections onthe hydraulic brake system, perform thefollowing jobs. Disassemble the brake sys-tem, drain the brake fluid, and clean it. Afterthat, add a suitable amount of brake fluid.Then, bleed it after reassembly.• Use only brake fluid for washing brakecomponents.• Use new brake fluid for cleaning the brakecomponents.• Immediately wipe off the spilled brake fluidto avoid damage to painted surfaces orplastic parts.• Handle brake fluid with special care not tolet it enter your eyes so that you may notlost your eyesight.• FIRST AID FOR BRAKE FLUID ENTERINGTHE EYES:• Flush with water for 15 minutes and get im-mediate medical attention.EAM30029CHECKING THE FRONT BRAKE DISC1. Check:• Front brake discDamage/galling  Replace.2. Measure:• Brake disc thicknessMeasure the brake disc thickness at a few dif-ferent locations.Out of specification  Replace.3. Measure:• Brake disc runoutOut of specification  Replace the brakedisc.a. Place the vehicle on a maintenance standso that the front wheel is elevated.b. Remove the brake caliper.c. Hold the dial gauge at a right angle againstthe brake disc surface.d. Measure the runout 1.5 mm (0.06 in)above the brake disc edge.4. Replace:• Brake discRefer to “ASSEMBLING THE FRONTWHEEL” on page 4-4.EAM30519REPLACING THE FRONT BRAKE PADSTIPWhen replacing the brake pads, it is not neces-sary to disconnect the brake hose or disassem-ble the brake caliper.1. Remove:• Brake pada. Remove the pad pin plug “1”.b. Loosen the pad pin “2”.c. Remove the brake caliper “3” from thefront fork.Brake disc thickness limit2.5 mm (0.10 in)Brake disc runout limit (as mea-sured on wheel)0.15 mm (0.0059 in)G098641