1981-1984 Official Honda ATC250R Shop Manual, Page 201Get this manual
ATC 250R Measure the brake disc warpageSERVICE LIMIT: 0.30 mm (0.012 in)
'82 ATC250R ADDENDUM
BRAKE CALIPER
BRAKE CALIPER REMOVAL
Remove the brake caliper (page 17-15)Remove the brake pads (page 17-15)Operate the brake pedal to force the piston out from the cylinder
Place an oil pan under the caliper to receive drained brake fluid Avoid spilling brake fluid on painted surfaces or rubber parts