Anytime I drive my 2012 CRV, the brake pedal gets hard and the calipers seize up. What is the cause?

 

I'd say you are having a problem with the brake system.
The way you explain your problem it sounds like you are driving along and the brakes seize up.
Is that what happens.

 

If the brake pedal “gets” hard that means there:
a. are no leaks (good)
b. the piston has reached full compression. That may or may not be good.

If the pedal is hard as in you cannot push it any more (standing on it) and you have not locked up the brakes as in tire skid or actuated the ABS (which would cause a pulsing feel) and your face is not trying to meet the steering wheel then you have a problem.
Note: Assuming the pedal is not contacting the floor.

Then there is the “Calipers Seize”
Not sure what that means. If they truly seized then you are not going anywhere due to locked brakes or no brakes.

What causes that is:
Bent or corroded pins/ slides.
Stuck pistons.
Broken discs.
Broken or incorrectly installed pads.
Loose or incorrect wheels.

Photo of caliper would be nice.


Good Luck

 

We fixed it, turned out it was the brake switch on the pedal. Someone had adjusted the switch on the brake pedal, leaving the brakes slightly compressed. We removed the switch and drove it, in order to adjust the switch so it wouldn't be under pressure. Thanks for the info!