I removed break calipers on front of 86GT to remove rotors and when reinstalled the break pedal went to the floor, and break light came on. I pressed break pedal several times and the light now stays off except when you press break pedal hard and hold the pedal down it goes to the floor and brake light comes on. These are Grand AM breaks. Any help Thanks
If you removed the BRAKE calipers from the vehicle by disconnecting the hoses, you will need to bleed the air out of the brake lines. There are write ups on how to do that on the forum. Just use the search to find them.
Did you replace the caliper and/or lines? Once you open any connection, you must bleed the brakes. If you replaced the pads and this happened, then there may be another issue, but it sounds like you replaced hydraulic parts, but didn't bleed the calipers afterwards.