I prefer to remove the tires to properly inspect my brakes whether for disc brakes or for drum brakes. It is not necessary though and you'll likely find most repair shops will do a brake inspection with the tires on unless they want to be able to show you the wear and remaining brake linings.
take the tires off and old brakes off and put the new ones on. put the tires back on and drive!!
it could be tires, wheel bearings, tie rod ends or ball joints. any of these and other reasons could cause your problem. you need to take it to a shop and have them inspect it. it may cost you a minimal fee, but it's cheaper than replacing everything if it doesn't need it.
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are the tires the same size and did you take this to a shop they could of adjusted your brakes when the wheel were off i know at my shop when we tend to do tires f the rear brakes need to be adjusted we will do them in the tire package if this is the case after a good run in the car with a bit of braking it should go back to about the same as it was once pad make there new grooves
If you don't know how, take it to a local shop. Most retail chains will inspect your brakes for free and let you know. They will visually inspect the brake pads to determine if there is enough life left in the pads to give you a rough estimate on how long you can go before replacing them. If you notice a vibration or pulsation when braking, you should probably get it looked at as well.
Both air brakes and hydraulic brakes are capable of locking up the wheels. It would depend on the weight of the vehicle, tires and road conditions.
take front tires off.
If you inspect them very carefully they can be a good deal but you always take a risk. Impression of the driver is very important in this.
That varies a lot depending upon what kind of car it is, what kind of brakes it has, what kind of tires, the condition of the tires, the condition of the brakes, how much weight it is carrying, what is the road condition, is there snow, ice, or rain on the road.
Jack your truck up, take your tires off, and look at the brakes, you can usually see them. if not you need to take the piston housing off that pushes the brake pads against the rotor. another clue that your brake pads are worn is your brake fluid. if its low it usually means your pads are worn (the more you have to push on the brakes to get the pads to push on the rotor the more fluid is used) Jack your truck up, take your tires off, and look at the brakes, you can usually see them. if not you need to take the piston housing off that pushes the brake pads against the rotor. another clue that your brake pads are worn is your brake fluid. if its low it usually means your pads are worn (the more you have to push on the brakes to get the pads to push on the rotor the more fluid is used)
just take the tires off the back and the hubs should be free to move. if not, try prying a little, but be careful.
At that point I would ask them why they didn't adjust and inspect the parking brake when they did the brakes. Yes, it's possible, but I wouldn't let them do the work if they aren't going to take care of it under warranty.