It usually shows up when while bleeding, 1 cylinder keeps on bubbling air, you have a good pedal that will gradually fade to the floor....


My GMC has a bad case of ship fitters disease!
GMC: Get More Cash...
1958 GMC
1956 Chevy 1500 Hydraulic Dump Truck
1952 Chevy 1700 3-Ton Firetruck

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