If your brakes are locking up it is because the ABS is not working.
there are bleeders on the wheel cylinders
You replace the brakes on an ABS S10 the same way you replace brakes on a non ABS S10.
Yes, the front has discs brakes on them.
The abs brakes on the back of a 94 S10 are designed to help slow the truck down quickly. Without abs, the brakes can lock up and the truck could slide uncontrollably.
Probably air in the system.
yes
Yes it does, I have one!
Out of time, or vapor locking if overheated.
Yes it is . The only difference may be drum or disc brakes.
it's a 3/8 Allen key
You need to adjust the cable on the brake.