W350 1 Ton Pickup 4WD V8-360 5.9L VIN 1 4-bbl (1988)
(0.050mm).
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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.
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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.
