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Re: Purpous of dump valve on 93 chevy g series 2500 diesel
Posted to Technical Theory Forum on 4/19/2011

Wait at least 15 seconds before pushing the pedal down and do not pump the pedal. Merely push it down and hold it.

You might have to force an ABS event and rebled using the above method.

I learned this long ago. You have to wait in between and do not pump ... Login to read more.