My guess would be the master cylinder failed.
Spongy brakes are caused by air in the brake lines.
brakes squeeks can be caused by dust and dirt on the brakes, but usually on a chev, this is caused by the brake pads,with the removal of asbestos and the adding of more metal to compensate, chev brakes are renowned for this problem
slack adjuster is the adjuster on the brakes of vehicles with air brakes. these are used to adjust and take the slack out of the brakes caused by usual wear on the brakes
When that happens to me, I "fan" the brakes until they dry. "Fanning" is lightly applying the brakes and releasing several times in succession. The heat caused by the friction will dry out the pads after a few "fannings". You want to do this right after you run over a puddle of water, don't wait till you get to a stop sign or until you have to stop suddenly to find that your brakes are sticking and not working properly.
excessive heat caused by using them too much brakes out of adjustment.
Friction
It is possible that the leg has "fallen asleep", or the proper amount of blood is not circulating through the leg. This is usually caused by not moving for a while whilst sitting on your leg, and goes away very quickly.
Stalling while driving may be caused by a collapsing or kinked neoprene fuel line.
The squealing sound in brakes is caused by dust and dirt in the brakes. Also, more commonly, it is caused by worn pads or shoes. On disk brakes there is a wear indicator. This will rub against the disk and squeel when brake pads are worn to where they need replacing.
Typically, a knocking noise when to use your brakes in the car is caused by your brakes wearing down. This means you need to get them checked out and repaired.
It could be air in the brake line, or the brakes getting too hot from too much friction by using the brakes on a steep hill or riding the brakes, or there could be a problem with the master cylinder.
Hiccups are caused by the diaphragm contracting suddenly and compressing the lungs.