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Brake Booster

rooster5.3

By rooster5.3
in Ask A GM Technician

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rooster5.3 Enthusiast

rooster5.3

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Looking for some advice on my truck. Have a inconsistant idle I have been chasing. Crusing and acceleration are unaffected. Today I noticed if when pressing the brake, the idle would go up a little. When I pumped the pedal it went up a lot and I could hear the idle rise. Pedal is mushy also. Is this a sign of a bad booster?

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