If they did not replace the rubber sections of brake line when the replaced the calipers it is possible the rubber lines need to be replaced. What happens is the rubber breaks down internally causing a restriction that keeps the caliper under pressure. Often when the rubber lines fail in this fashion they look perfectly normal on the exterior. If the lines are original to the car that are now 22 years old, they deserve to be retired.

BTW, that orange idiot light is for the front brake sensors. Once the light comes on you have about 1000km of brake material remaining. No sensors on the rear.

__________________
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.