Avid disc brakes may ship with a pad spacer/bleed block installed in the caliper to prevent improper advancement of the pistons
and pads during shipping. After removing a pad spacer, bleed block, or rotor and wheel, it may be necessary to perform the pad
advancement procedure. Squeezing the brake lever once is not sufficient to properly advance the pads. Improper pad advancement can
cause the brake lever to pull to the handlebar during installation which can be misdiagnosed as a poor brake bleed or other problem.
Be sure to complete the entire disc brake pad advancement procedure.
If the brake pads are not advancing evenly, push the pistons back into the caliper bore and repeat the pad advancement procedure.
If the pistons are sticky, spray isopropyl alcohol on the caliper and clean it with a rag, then remove the brake pads and lubricate the
piston’s seals with DOT 4 or 5.1 fluid. Wipe off any excess fluid then reinstall the pads.