Hi. If the brakes are sticking on it won't be the servo thats at fault it's sound more like the calipers need cleaning.
The brakes could be binding or a caliper could be sticking. Remove the wheels and make sure that the brake system is operating properly.
a sticking/partly sticking caliber piston is usually the culprit but a froze parking brake cable could cause the rear brakes to heat up also.
two possible causes......it could mean you have a bad brake hose or a sticking caliper
Your brakes are sticking could be either the brake caliper or the hose going to the caliper
This could be caused from the closing off of the flex line or a bad caliper or a bad master cylinder
This could be for a few reasons, but if they are getting hot without you applying them, I would suggest that they are sticking and causing the pads to rub on the discs, or if they are drum brakes, the shoes on the drums. If they are only getting hot as a result of using the brakes, I would suggest checking that the brakes are balanced properly, and that the front brakes are not doing all of the work/ or that the back brakes are working at all.
what you have could be one of three problems. Check your reservoir to see if it has plenty of brake fluid, bleed your brakes,they may of lost the fluid while changing brakes. Also, if you have a vacuum leak it will cause your brakes not to work. Or it could be your master cylinder or your vacuum booster that has went bad. brewski
It's rare....because usually the master cylinder will allow pressure to bleed off. Not the other way around. But if you have replaced the calipers, this is the next thing I would check. I suppose it could be sticking.
Cable is rusted, bent, or hanging for some reason. Could also be the parking brake needs adjustment. The brake is not fully releasing.
Not really an answer, but another question... did you bleed the brakes after you changed them? I remember that is a critical step, NOT to be missed when working on the brakes. Hope this helps.
Anti-rattle clips not installed properly
Its most likely your hand brake sticking on slightly, it could be the hand brake cable sticking or the hand brake mechanism its self. I would get them looked at because if it sticks on for longer periods then the brakes will get hot and bind or even seize on and it will ruin the wheel bearing too if it does, as it will damage the grease and will start to whine (more expense) Hope this helps