The brake light on my 08 FLXH Streetglide stays on all the time.

Mcmom, Either your brake pedal is not coming up far enough to the brake switch, or the brake switch is faulty. You may still have air in brake system not allowing pedal to come up high enough to contact switch, pull brake pedal all the way up and have a second person see if brake lights go off.
Links below to show brake switch location and show how brake pedal arm should come all the way up to turn off brake lights.
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How To install Replace Brake Light Switch 2004 08 Ford F150 and more...

Brake lights stay on

brake lights stay on Ford F150 Forum

One of your head lights is burned out, either the high or the low.

brake switch may be out of plase check your switch provably located near the pedal

check accessory fuse...

If all three brake lights are on, I'd say the problem is in the switch by the brake pedal. Take the cover off below the steering wheel and inspect the brake pedal and the switch. It may be as easy as spraying some silicone lube on the actuator. Try to do a search on this forum for brake light switch.

I haven't done a brake job on a bike this new but it shouldn't be any different than any other bike. Simply take the two bolts that hold the caliper on out. Remove the old shoes. Use either a large C-clamp or a large pair of slip joint pliers and squeeze the piston back into the caliper all the way. Install the new pads and put the caliper back in place. Replace the two bolts and torque them to 25 Foot pounds. Squeeze the brake lever until you have a good firm brake.

Good Luck
Steve

Your still under warrenty, take it back to the dealer if you work on it the warrenty is void.