If the truck has power brakes then with the vehicle running pull the hose loose from the power brake booster. If engine doesn't kill then your booster is leaking vacuum. I know this sounds weird but the vacuum as explained to me is also engine vacuum reservoir. Been through that before.
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- 1972 Cheyenne Super 20 LWB-Blue
- 1972 Cheyenne Super 10 LWB-Black
- 1972 Cheyenne Super 10 LWB-Red
- 1972 Cheyenne Super 10 LWB-green
- 1972 GMC 4x4 LWB-White
- 1971 Cheyenne 10 LWB-Ochre
- 1971 Cheyenne 20 Longhorn-Copper
- 1971 Cheyenne 20 Longhorn-Black
- 1969 Custom 10 LWB-lt blue
- 1968 GMC 3/4 ton-green
- 1968 1/2 ton swb stepside-silver
- 1967 Chevrolet CST 10 LWB-green
- 1967 Chevrolet custom 20 LWB-Maroon
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