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Brake problem on startup

Tnavy

New Member
Joined
Aug 12, 2012
Messages
3
2010 Avalanche LTZ. If I let my truck set for a couple days and then I go to drive it, basically no brakes. Pedal goes to the floor with a little bit of spongy. After the 1st use they work fine but will do it again the next time it sets.

Anybody had this problem before or any suggestions what it might be? Thanks for any help
 
Air in line?
Needs bleeding?
Calipers issue where pads somehow retract way too much over night??? weird but I guess possible.
Brake power booster leaking or bad seals (powered by PS pump)

Issue with PS pump.

IF you have not ever worked on brakes time to take to mechanic.
 
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