flatcat19: I believe the brakes drums are properly adjusted since they were working well yesterday
wayno: As far as bleeding the NSLV my friend I was with and I actually did that to see if it would help but it did not. We actually were meeting up so they could help me flush the clutch so I had fluid, line, and tools in the back already. There didn't seem to be air in the line. We didn't try to bleed any of the wheels again.
KingRat: I will do that line check tomorrow forsure, do you think I need to drive around a bit in order for the pressure to build? They pretty much lock up first stop.
I'm also planning on popping the drums off to make sure the shoes are moving properly, any idea what to look for in there? I'm assuming both shoes should move outward when the pedal is pushed down and return all the way when the pedal is lifted? Are their any common culprits within the drum asssembly? I wondering if maybe all the pumping of bleeding the brakes broke some old crusty hardware loose that is now stuck again?
Thanks for all the info!
Keep in mind that the brake masters have residual valves, so that means that when you hit the brakes and let off the brake master is supposed to hold 10lbs of pressure on the rear drum brakes, and 2lbs of pressure on the front disc brakes, so don't expect the springs to pull back the rear brake shoes all the way right away, the drums stop the pistons in the wheel cylinders from moving that far out in the first place.
My 1986 chassis has this issue of having the rear brakes lock up the first few times I use the brakes in the morning, it happens so fast that the whole cab shudders, so I pump the brakes real hard when I am stopped at the stop sign and it usually goes away and acts normal till the next time/day I drive it, I adjusted the rear brakes a couple days ago and it fixed the slamming/shuttering, but the rear wheels still locked up the next time I drove it.
I didn't have this issue when I first built the truck, but it came on after sitting for long periods of time, sometimes even my e-brake sticks and I have to drop the clutch in reverse to break it loose, this e-brake issue has happened on two of my 720s that sit for long periods of time.