I just bought this nicely used 1991 GMC Sierra 1500 series pickup truck for $650. It started up and ran fine when I gave the seller the money - the few leaks in the break lines.
Easy fix right!
So my son (19 that knows it all) and I went and changed all the break lines (made everything one size 3/8 line.) Filled it up with break fluid and started the truck. I had my so pumping the breaks and holding them (his first time) I bled the far rear (passenger side) then I had him turn the steering wheel to the right so I could bleed the front driver side.
He turned, and turned and turned until the the engine died.
Now the truck only runs when the steering wheel is turned all the way to the right or all the way to the left.
Going to pull the codes to see what the heck is going on…
Any help other than that is very appreciated!