Cleaning, Inspecting & Honing Caliper
Cleaning and Inspection1. Use a wire brush to clean all rust and corrosion from the machined surfaces of the caliper housing.
CAUTION: Do not use wire brush in cylinder bore).
2. Clean all parts using denatured alcohol and blow dry with clean -- oil free -- air.
3. Blow out all drilled passages.
- Be sure that the cylinder bore is free of foreign matter and corrosion, especially in the seal area.
- If corrosion is present in the boot or seal groove, use a fiber brush to remove it.
4. Inspect the cylinder bore, seal and boot groove and the piston for damage or excessive wear.
- Replace the piston if it is pitted, scored or the plating is severely worn.
- Bores that show light scratches or corrosion can usually be cleaned 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 (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 piston seal and will do no harm.
5. Use a wire brush to remove any rust or corrosion from the machined surfaces of the adaptor.
6. Inspect and clean the shoe anti-rattle spring, caliper support spring and caliper support key.
- Replace if damaged.
Fig 14 Honing Piston Bore:
Honing the Cylinder Bore
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.