It's PROBABLY warped disk brake rotors. Brake rotors will warp when overheated and if you go downhill very often, they've probably overheated.
Replace the rotors with a high quality product and they'll last longer.
Warped rotor(s), due to too much hard braking (or braking for too long, like when going downhill). You can replace them or get them shaved so they are flat again. Break sooner and not as hard will prevent them from overheating, which causes them to warp.
it shakes to the right or left
usually steering shakes over 60 mph is due to front tires needing to be balanced unless you have something more serious going on.
Braking distance may increase when going downhill because gravity is working against the brake system, causing the vehicle to maintain momentum. The added force of gravity can make it more difficult for the brakes to slow down the vehicle quickly. Drivers should use caution and brake at a safe distance to account for the increased braking distance.
To prevent brakes from overheating while going downhill, you can use engine braking by downshifting to a lower gear, apply brakes intermittently instead of continuously, and avoid riding the brakes for extended periods. This helps distribute the braking force and reduces the risk of overheating.
You may have a ball joint going out or your wheels are unbalanced
check the balancing on the tires.
we could go about 35mph when not going downhill you can go 28mph
Have your tires rotated and balanced. Make sure they inspect the tires/wheels for any damage.
Milk Shakes! They are always going to the resturaunt to have milk shakes.
No the can go faster downhill or uphill
To protect your vehicle's transmission from damage caused by engine braking, you can use lower gears when going downhill instead of relying solely on engine braking. This helps reduce the strain on the transmission and prevents overheating. Additionally, avoid prolonged periods of engine braking and consider using a transmission cooler for added protection. Regular maintenance and fluid checks are also important to ensure the transmission is in good condition.