The brake calipers would stick on and off in no discernable pattern whatsoever and because of that, I didn't realize this was a brake caliper problem, I thought that I had tire balance issues. Then one day they seized up fully and started to burn and smell, that's when I knew it was a sticking caliper issue. So if you feel your steering wheel shaking randomly when you drive but it comes and goes, check your rotors for excessive heat and replace your hoses when you replace your calipers because sometimes the hoses are the real problem.