Well it's pretty clear in the daylight. Drove up to the truck and saw a big puddle underneath it which was weird because it's way below freezing. Master was empty and when I layed under it this is how the lines looked. Got stainless steel oe replacement line kit by doorman from advanced auto that I'll be throwing in hopefully soon. Again thanks to yall for your help, I feel pretty stupid putting "doubt it's a fluid leak" in the title now... Oh well you live and you learn.
Thanks everyone for your help. I now have many things to check with a friend tomorrow. I will keep you updated.
Thanks yes you're right. I wonder how air is supposed to get in though since it got bad very fast and a hole would leak fluid. I want to check tomorrow if the master has an internal leak that lets fluid cycle straight back into the reservoir and therefore getting the pedal to the floor. To the question about bleeding the breaks, I heard that it's quite the task on these newer trucks, read that you need a computer to cycle the automatic bleeder. Can I still bleed the breaks at the wheel cylinders like with old cars and trucks or will I need the computer?
I get your point. Is it possible that the fluid is bypasssing inside the master cylinder and the sound I heard when I pushed the brake with the engine off was from the diaphragm pushing air through the vacuum hose? Is there a blow off or something like that in the system or is maybe the check valve at the end of the vacuum hose where the air comes out?
Not sure but I think it's vacuum see the big hose coming from the manifold in the pic. Don't let the shadow fool you the reservoir is full
Thanks for the quick answer. Makes sense to me that the master might be the problem, after all it's directly connected to the pedal so it has to pump when the pedal move right I might add that now that the problem surfaced, looking back there were situations the last few days when I was breaking to get to a stop and had to push it in more than usual to come to a stop
Hi community I have a break problem. Hoping to find help here. I wanted to get home tonight and when I pressed my break pedal to put the truck (04 Silverado 1500 LS 5.3) in D the pedal went to the floor hitting the break switch which turned on the warning. I tried pumping the pedal which made it a little bit stiffer but when I kept my foot on the pedal it would sink to the floor almost effortlessly. I bled breaks on older trucks before and it didn't feel like a fluid leak to me. Got out in the cold to check the fluid reservoir it was at the max level so all the way full. Tried some more but virtually no breaks. Walked around the truck with a flashlight (just in case) but all the wheels were dry no sign of fluid leak at the cylinders. Then I shut the truck off and pressed the break pedal. With the hood shut and all doors closed I could hear air being pushed out somewhere under the hood, again the pedal went to the floor. I was alone so I couldn't ask anyone to check where the air escaped unfortunately. I did it again a few times and it felt like I was pumping a tire with a foot pump, sounded like it too. Very weird, it seems like it can't be a big problem so I'd like to know if anyone has a hunch or encountered anything like this. I'd prefer to find the issue and fix it rather than change parts blindly. It was really cold and I wanted to get home so I called a buddy to pick me up and didn't check things like blowing and sucking on the check valve. I hope I'll have time for that tomorrow but I would be happy if someone has suggestions to what I can check or which parts I should buy and replace first Appreciate any help!
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