1986-1989 Honda TRX250 FourTrax 250R Service Manual, Page 185Get this manual
Quality of the image is intentionally reduced!
HYDRAULIC DISC BRAKES Remove the front and rear brake discs (pages 10-9, 11-4)Measure each disc for warpageSERVICE LIMIT: 0.30 mm (0.012 in)
Avoid spillingfluid onpainted, plastic, or rub