flatford39
Junior Member
- Joined
- Feb 11, 2014
- Posts
- 23
- Reaction score
- 0
- Location
- NE Illinois
- First Name
- Tom
- Truck Year
- 1979
- Truck Model
- K2500
- Engine Size
- 350
I had just finished changing my complete exhaust system on my 1980 K10 and I got behind the wheel to start the truck up and as is my custom I had my right foot on the brake while I was listening for leaks when all of a sudden the pedal went to the floor. This is while the truck is in park and idling. When I shut the engine off the pedal resumes its normal position which is pretty high indicating a lot of brake available,but once the engine is started and I apply pressure the pedal goes to the floor. I don't see any leakage anywhere and the MC is full. Is this vacuum related or do I have a bad master cylinder???
thanks for any advise.
thanks for any advise.