Cruise Control problems of the 2015 Toyota Camry

Bought with 22k miles about 1 1/2 years ago. The cruise control speed and the speedometer issues have always been present. When using cruise control (under 45 suburban and urban streets) the car sometimes cannot regulate on slight inclines and speeds up by up to 5 mph over setting and doesn't decelerate. Several times it's done it on flat roads. It's never done this on the freeway even coming up slopes. It's rare that my digital speed reading is the same as my set cruise control speed. My digital speed reading also usually differs from my speedometer by about 2-4 mph also, sometime last summer an issue with my brakes has been occurring and is becoming more frequent. When first starting my car (I notice it on damp or dewy mornings) I can hear my brakes as I'm backing down my slightly sloped, cement driveway. I put my car in reverse and barely tap the gas because I go very slowly because we have a short driveway (35-40ft total) and a little lip at the entrance where the driveway meets our culdesac. It's not every morning and I've never noticed it any other times. Sounds like when brake pads are wearing down and feels almost spongy when pressing brake pedal. No squealing or chirping. Ive had my brakes checked twice and they're in good shape. *current mileage is approx 42k.