About rubber lines .I had a problem years ago the brake peddle would get harder the more you drive and stop .Finally one day the brake got so hot it caught the plastic backing plate on fire and the front brake on the one side was seized.the car was parked in a lot overnight and the next day it was fine .Ended up being the rubber line as it would not release all of the pressure and would lock up the one brake if it sat for awhile it would slowly release the pressure .The rubber line looked fine on the outside but was no good so if the lines are cheap enough it may be time to replace .
