Cleaning, Inspecting & Honing Caliper

Fig 14 Honing Piston Bore:

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

NOTE: Whenever a caliper has been disassembled, a new boot and seal must be installed at reassembly.

Inspect the piston bore for scoring or pitting.
- Install a new piston if it is pitted, scored or the plating is severely worn.
- Bores that show light scratches or corrosion, can usually be cleared with crocus cloth.
- Bores that have deep scratches or scoring should be honed, using Tool C-4095, or equivalent, providing the diameter of the bore is not increased more than 0.002 inch (0.050mm).
- If the bore does not clean up within this specification, a new caliper housing should be installed.

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

When using Hone C-4095 or equivalent, coat the stones and bore with brake fluid.

After honing the bore, carefully clean the seal and boot grooves with stiff non-metallic rotary brush.

CAUTION: Use extreme care in cleaning the caliper after honing.

Remove all dirt and grit by flushing the caliper with brake fluid; wipe dry with a clean, lintless cloth and then clean a second time in the same manner or until clean cloth shows no signs of discoloration.