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You're mistaken, there are two pistons in the rear also .... 200 1982

posted by  Ken C on  Tue Jan 24 10:33 CST 2012
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last visit: Fri Oct 24 11:39 CST 2014
[RELATED]

re: "...There is only one piston on the rear brake and ...."

I'm afraid you're mistaken. There are two pistons, one on each side, in the rear calipers. The fronts, of course, have four pistons, two on each side.

Even without taking it apart and showing you, just consider: since the caliper is firmly bolted in place and unable to move, if there was only one piston then only one pad, on that side, could compress against the rotor. What would enable the pad on the other side, presumably without a piston, to move and press against the opposite side of the rotor?

I think that you're confusing the 240's rear calipers with a "floating caliper" (on newer Volvos) that has pistons on only one side -- the floating caliper is such because it's the moveable body of the caliper itself (made possible by "pins" on which the caliper slides) that enables pushing pads against rotors on both sides. But a 240's rear caliper cannot move, so it must have pistons on both sides.

And, if you look at your rear calipers, you'll see the pistons on both sides.





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