Are you replacing a caliper? Sounds like one of the pistons is frozen so the force was coming from one side.

A Jesus nut is the nut that secures the propeller on a airplane. If that nut fails in flight guess who you we be seeing next? Sort of like failed brakes on a car!!

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Bill Reimels
Now down to one:
1972 300SE 3.5 W109 (Euro delivery)