Lately, when brake is being applied, right before coming to a complete stop, the pedal will go all the way to the floor and the truck still moving...
Does this sound like the master cylinder? I am about to put new pads on and I was going to address this issue as well. BTW, I have 4 wheel disc.

 

Maybe I should've put this in GM Drivetrain & Suspension...

 

Sounds like the master cylinder to me.....

 

Ditto, that would normally be the issue there.

 

just go back with a rebuilt unit form the parts store?
new one? any upgrades for this?
182,000 miles of braking...whoodathunkitt?

 

You could swap to a hydroboost setup for firmer pressure and more controllable braking....but other than that, no

 

That sounds like a major swap though, right?

 

I see a repair kit available for 20 bucks.
Is this a simple repair compared to $90-$130 for a master cylinder or no?

 

check your rear break line that crosses over to each rear tire, mine broke into going down the 1/4 mile track it suxs going 106mph and no breaks at first lol.

 

Any info on the repair kit?