W 350 Pickup V8-5.9L VIN Z (1990)
Fig 13 Installing Piston Dust Boot (Typical)
4. Install in caliper by working into outer groove, using fingers only.
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Boot will seem larger than diameter of groove, but will snap into place when properly positioned in groove.
4. Plug hydraulic fluid inlet to piston and bleeder screw hole, then coat piston with brake fluid.
5. With fingers spreading boot, work piston into boot and press down on piston.
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The entrapped air below piston will force boot around piston and into its groove as piston is depressed.)
Fig 14 Installing Piston Through Boot (Typical)
6. Remove plug, then carefully push piston down the bore until bottomed.
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Force must be applied uniformly to avoid cocking piston.
Cleaning, Inspecting & Honing Caliper
Cleaning and Inspection
1. 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.
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Be sure that the cylinder bore is free of foreign matter and corrosion, especially in the seal area.
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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.
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Replace the piston if it is pitted, scored or the plating is severely worn.
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Bores that show light scratches or corrosion can usually be cleaned with crocus cloth.
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Bores that have deep scratches or scoring should be honed, providing the diameter of the bore is not increased more than 0.002 inch
