With Caliper Removed

WITH CALIPER ON VEHICLE
Check for piston seal leaks (brake fluid in and around boot area and inboard lining) and for any ruptures of piston dust boot. If boot is damaged, or fluid leak is visible, disassemble caliper assembly and install a new seal and boot, (and piston if corroded or scored).

Check the mating surfaces of the abutments on the caliper and adapter.
- If corroded or rusty, clean surfaces with wire brush. Inspect braking surfaces of disc.

Check dust boots for punctures or tears. If punctures or tears are evident, new boots should be installed upon reassembly..

WITH CALIPER REMOVED
Cleaning
Clean all parts using alcohol or a suitable solvent and blow dry, using compressed air. Blow out all drilled passages and bores.

NOTE: Black stains on the bore walls are caused by piston seals and will do no harm.

Inspect the piston bore for scoring or pitting
- Bores that show light scratches or corrosion, can usually be cleared with crocus cloth.
- Bores that have deep scratches or scoring should be honed, providing the diameter of the bore is not increased more than 0.002 inch.
- If the bore does not clean up within this specification, a new caliper housing should be installed. Install a new piston if the old one is pitted or scored.