There are no bearings in brakes, but the hub has large ball bearings
Aircraft have disc brakes, but they're different from automotive disc brakes: the calipers are the same size as the rotors and they have pads going all the way around. On a really big plane, like an airliner, there are multiple discs.
You can get brakes from any automotive supply store or the dealership. I would highly recommend that you have them professionally installed, since if they are installed incorrectly you could get into a car accident. Brakes can be done at almost any type of repair shop, however I would usually go to one that is recommended for that particular service or the dealership.
Those with drum brakes, the bearings are NOT sealed - they are the very traditional type bearingsSee "Related Questions" below for more
What is the aircraft type that operates to Istanbul
Do you want to buy a plane with old instruments in it, and have them updated to new? First you must find instruments approved for your plane, then you have them installed - you can't do it yourself, an FAA-licensed aircraft mechanic must do it - under a Supplemental Type Certificate.
Sleeve bearing
roller thrust bearing
Squeaking usually caused by vibration Anti-rattle clips (if any) installed? A paste type compound is available to stop rattle
Disc brakes
The perfect aircraft to use as a 'Utility Aircraft', would be any type of the Hercules Range of Aircraft.
Drum brakes.
Not--the terrain and type of aircraft Not--all of the terrain, type of aircraft, and environmental conditions