2007 Chevy Silverado Classic Brake Pedal goes to the floor when engine is running.

Asked by Tayte13 Apr 23, 2018 at 02:34 PM about the 2007 Chevrolet Silverado Classic 1500 1LT Crew Cab RWD

Question type: Maintenance & Repair

2007 Chevy Silverado Classic Brake Pedal goes to the floor when engine is
running.  I had a brake line blow, so i replaced all brake lines with pre-bent
stainless steel lines.  Slowly bled brakes.  Had good firm pedal until i started
the truck.  Then it went to the floor.  Replaced booster and rear cylinders.  
Bled back brakes for 2 hours with vacuum pump first, then the standard
slowly pushing on the pedal method until no air in fluid and brake pedal was
firm.  Started Truck back up and same issue.  Bled again, and same issue.  I
have no leaks, i have been over every line a bunch of times.  Any help?   

3 Answers
160

debstew answered 6 years ago

The calipers are on the wrong side. I just had this issue and never even thought that was possible to mix them up. But the bleeder needs to be at the top. I drove my self crazy trying to figure it out. But it's possible to put them on the wrong side and they go right on with no issue. I hope you all have figured it out by now but I just wanted to put thus here cause I never saw an answer that suggested this.

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Guru932ZH answered 6 years ago

I have the same problem on 1993 F250 truck. Repaired leaking brake line, replaced front cal. and rubber hoses, replaced MC,bled brake lines many times using over 2 qt. brake fluid, and yes cal. is on correct. I have heard could be abs mod. anyone else heard this.

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