my 155 2.5 v6 as front brakes that partially seize on for no apparent reason,ive cleaned callipers etc and it still happens beleive it or not they seem to apply there selves even while not braking.the only thing i can think of is the abs and or its sensors malfunctioning.
any ideas as im pulling what bit of hair i have out its on an l-plate
dont worry the simplest ideas are the most effective (sometimes) i had this and one or 2 others , jack car up one side at time ensure the brakes are still binding then simply crack the nut on the flexi pipe that provides the caliper with brake fluid the if wheel then spins freely simply replace the flexi pipes easy job but watch out for the fitting at other end of pipe as can seize up a bit apply some WD 1/2 hr before job my car did this as id replaced clutch and disturbed pipe doing it . small peices of rubber inside pipe act like a valve as its easy to apply pressure to brake with your foot but only the vacuum to pull it back so it sticks .
hope this is your problem as its always a relief to know its not gonna be expensive!!! wink