Was changing brake pads/rotors on front and rear today and noticed on the passenger side rear, one of the small springs are missing off of the caliper. Looks to be part of the parking brake maybe? Anyways found a pic on Shoebox's site (Thanks again, great site!) It's 12 in the diagram... anywhere I can get that or have to buy a new caliper?

http://shbox.com/1/rear_caliper.jpg

 

GM PART # 10112650
parking brake collar return spring

 

Thanks a ton shoebox