Squeeking\squeeling noise from under my 2001 chevy silverado z71

Lots of video help in the link. Some vehicles have a shim kit which you have to buy as an extra part kit. Mine does.

https://www.google.com/search?q=2001+Chevy+Silverado+brake+caliper+not+releasing

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Most likely a belt problem or a worn out tensioner. You left off the year, make, model and engine so it's a guessing gamet. Read this post on how to track down the source of noise

http://ricksfreeautorepairadvice.com/diagnose-squeak-noise-creaks-and-squeals/
Diagnose squeaks creaks and squeals

Did you check the rest of the U-joints. If you have a hanger bearing, you should have a 2 piece drive shaft and thus 3 more U-joints that could be bad.

OK, you're looking at a CV Joint or Halfshaft that connects to the wheel in question.

yes chaange your tension and or the idle pulley

The squeel is more then likely the clutch fan. It has a bearing that turns with the motot and when it slipps it squeels

on disc brakes there is a metal marker on them that when the pads get low on material it will make a squeeling noise to let you know its time to change the pads.. so I would say you are in need of front pads also even though they look good you are getting low.. this marker is designed to let you know its time before you get to metal to metal .. jerry

It sounds like loose belts but i also would check the front drive shaft. It has a reversed boot and they can be destroyed and you never know if you do not look.

is it a squeeking or a squeeling....

If it is a squeeking noise, take the car to have every thing on the front suspention lubed up, is possible it is dried out.

If it is a squeeling noise, then that means you need a new drive belt.

This sure sounds like a U joint, check them all again.