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68gmsee · 10-07-2010, 11:06 PM

Get a new master cylinder. The mc piston seal goes bad or splits allowing fluid to go past it and that lets the pedal go down.

They're not that expensive and should solve your problem. If it's been replaced recently, take it back and get a replacement. Be aware that new ones can also fail so keep the receipts.

10-07-2010, 11:06 PM	#2
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Brake problems Get a new master cylinder. The mc piston seal goes bad or splits allowing fluid to go past it and that lets the pedal go down. They're not that expensive and should solve your problem. If it's been replaced recently, take it back and get a replacement. Be aware that new ones can also fail so keep the receipts.