What would cause the brakes to feel really soft and almost go to the floor? on 2008 Buick Enclave

On occasion, my brakes will get really soft and almost go to the floor when pushed. It will scare you to death. Then, all of the sudden, they are fine. Just every few weeks it will do this. I thought I was imagining this at first, but now my husband drove it and noticed it, as well.

by in Lexington, MO on March 08, 2014
2 answers 5 comments
ANSWER by on March 08, 2014
You might have the ABS system function, auto bleed, to make sure there is no air trapped in ABS controller. The TECH2 scan tool has this function.
COMMENT by on March 09, 2014
I apologize, but what is the tech2 scan tool?
COMMENT by on March 09, 2014
Many shops have them, I have one. It is the scan tools that the manufactuer uses for the GM line of vehicles.
COMMENT by on March 09, 2014
Oh, okay. Thanks!
ANSWER by on March 08, 2014
Do yo know a good mechanic in your zip code! If so, test drive is what it needs to determine the problem! Mechanic will know how to check for a master cylinder bypass problem by lightly and constantly applying brakes. Any warning lights on in dash?
COMMENT by on March 09, 2014
No
COMMENT by on March 09, 2014
OK! That's all i need to know!!!