All Balls Racing – Caliper Rebuild Kits, including the 85-86 Honda ATC250R front kit, the 89-04 Kawasaki KFX250 Mojave front kit, the 06-09 Yamaha YFZ450 rear kit, the 2019 Can-Am Outlander 450 6x6 front kit, the 14-16 Polaris ACE 325 front kit and the 06-14 Honda TRX450ER brake pad retaining pin kit. ATV calipers live in mud, sand and standing water, and the piston seals are what fail first: grit works past a tired dust boot, the piston corrodes in the bore, and you get a dragging brake, a spongy lever or a pedal that will not release. These ATV brake caliper rebuild kits supply the piston seals, dust seals and hardware sized to the original bore so a caliper you already own comes back to full clamping force instead of getting replaced. Rebuilding also restores even pad wear, which keeps rotor temperatures down on long descents and stops one side of the machine from pulling under hard braking. Bleed and flush the system with fresh fluid at the same time so the new seals are not working against water-loaded brake fluid. Send us your year, make and model and we will confirm the correct kit and axle position before you order.