78 chevy truck front end shakes when driving. and when braking. it only shakes when it gets warm, when i first take off the truck drives smooth but like 5 min later it starts to shake and it gets worse when i brake. i just got new brake shoes and the rotors cut. im not sure what else it could be. it feels like the wheels are shaking sideways from left to right really bad to where they feel like they want to fall off. but as soon as i let the truck sit for 10 min it starts all over again