My brake pedal is hard to depress, ocassionally, when i try to start the car. The brake pedal usually should depress easily but sometimes it only depresses just barely to start the car and i have to press it hard.. It may do it a couple days in a row and then not do it again for weeks..The dealer had it for several days and could not duplicate the problem. it doesnt matter if it is hot or cold, or how long the car is sitting. Weird issue....the brakes work fine otherwise.