Common problem on a previously neglected Benz -- failure to replace
the rotors when they are too thin. On the W126 and prior chassis,
all the calipers have an anti-rattle spring on top, and when the
rotors are too thin and the pads are badly worn, the backing plate
will hit the spring. This cocks the piston, and since the inside
pads usually wear faster than the outers, the pistons get stuck and
can rust in place after they overheat and fry the dust boot.
I've had this on three or four cars already -- and on my Volvo with
the same ATE rear calipers. They are not American rotors, which are
way over-thick so that they last the lifetime of the car and can be
resurfaced. Worse, sometimes people turn the rotors on a Benz to
save money, and that makes the problem worse.
Do, also, change fluid every two years or when you change pads --
very easy with a MitiVac. Old fluid collects water and promotes
corrosion and the presence of crud, which will also lock the pistons up.
Peter
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