Say I'm stopped at a light and engage auto hold and take my foot off the brakes. Does the auto hold feature actually keep the brake pads applied or does it release that and engage the parking brake only?

I'm curious because for instance I'm coming down a series of long hills and have hot brakes, I don't want to imprint that on the rotors at a long stoplight.

__________________
'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr