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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc Brake System & Drum Brake System - RWD Trucks >> Overhaul >> Brake Booster - DELCO-Moraine Single Diaphragm >> Cleaning & Inspection

Cleaning & Inspection

Clean all plastic, metal and rubber parts in denatured alcohol. Blow out all passages, orifices and valve holes. Air dry all parts. Slight rust on housing may be cleaned with crocus or emery cloth. DO NOT  reinstall any rubber parts with cuts, nicks or distortion. If in doubt, replace the part.

NOTE: Prior to installation of rubber, plastic, and metal friction parts, lubricate with silicone lube.