I have 1980 300TD and have been redoing my front brakes little by little. On my right front side, I replaced the rotors, loaded calipers and replaced the brake hose (that was the original problem and just did the rest). Now everything is new and I hear a squeaking coming from that wheel. Any idea on what would be squeeking and why? The old rusted out brakes and rotor that barely worked (locked up when it did) never squeaked a bit. The car does it just rolling at idle. Not when just the brakes are a pressed.

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Current fleet-
2015 BMW 750i xDrive
2009 BMW 535i xDrive
2004 Chevy Avalanche 4x4
1993 Mercedes 300SD
1993 Mercedes 300SE (parts car)

Previous Benz's-
2001 Mercedes SL500
1983 Mercedes 300SD
1980 Mercedes 300TD
1996 Mercedes E300D
1999 E300DT
1984 300TD-T
1988 Mercedes 560SEL (parts car)
1979 300SD
2003 E500
2004 S430 4Matic
2001 E55
2003 E430