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The most obvious cause for a hard pedal is simply not enough vacuum. Check the brake power booster by pumping on the brake pedal while the car isn't running. Continue pumping until you've "bled off" the vacuum from the booster. Hold the pedal down while you start the car. The pedal should go down a bit more beneath your foot. If it doesn't, then you should examine the connection between the vacuum hose of the brake power and the engine's vacuum.
Replace the brake power booster if the connection's fine, which would fix the hard brake pedal problem.
It may be your calipers need replaced. Check them for signs of wear. Look at the metal spring where the brake pads sit.
Apply tension to the pad and see whether you hear a pop. If you do, the brake pad is moving too much on the bracket. Replace the caliper. This could help the hard brake pedal.
the condition you have experienced is called brake fade . It occurs when there is insufficient brake pad to adsorb the heat generated buy the changing of the kinetics energy (spinning) into heat energy by the friction of the brake pads on the disc rotors.. It gets to a point where the pads and discs will not take any more heat so when that happens it does not matter how hard you push the pedal there will be no brakes. To prevent this happening again fit new brake pads and fit new disc rotors. If you are going to be doing steep hill work then get a brake pad suitable for hard work. Talk to a brake shop specialist to get the best pads for the job. Another experience that you will have is when the brakes get hot the pedal goes to the floor. This comes from bad brake fluid and happens when the brake fluid absorbs moisture from the air and the boiling point of the fluid is lowered considerably. The oil boils and the water in the oil turns to steam and you get vapour lock in the system and you will loose brakes as you are compressing steam or air.. The fix for that is to ensure that you change your brake fluid every 12 months.
They have ABS and when you press the pedal hard the pedal vibrates. its the computer doing a pumping action for your. It grabs and releases the breaks so they dont lock up and it allowys you to stear your vehicles while the brakes are firmly pressed.
Usually this is caused by a broken or faulty brake switch. They are usually located above the brake pedal, inside the car. Look at the pedal from inside the car. Push the pedal down and watch it. Look for a switch that should extend a plunger when the pedal is pushed down. The plunger is supposed to go back into the switch when the pedal returns to it's normal position. This is what lets the brake lights know the pedal has been depressed. In most of the cases I have seen the plunger breaks or it gets cocked sideways and stays out or the switch holder itself breaks and the switch moves instead of the plunger. Then the brake lights think that the pedal is being pushed down even when it's not. Start there.
The only other time I have seen this is when someone used the wrong type of light bulbs in the brake lights.
Absolutely; wasn't positive until you mentioned the 'hum'. Bad bearings first warning sign is usually the humming noise before the vibration but since you have both, I'd be shocked if it weren't the bearinig, especially since you've got new rotors. In the past, a badly turned or warped rotor would mimic a bad bearing. Best of luck.
Where do you feel the vibration? if you feel it where you sit it is coming from back which is usually rear brakes. If you feel the vibration in your feet and hands it is coming from the front which could be your ABS or front brakes.