I replaced my rear brake rotors, pads and sensors only about 7,000 miles ago with MB rotors and pads from a dealership. When I took them to a shop just recently they indicated that the rear rotors are scored. When I'm on a freeway and apply the brakes I hear a slight cavitation. IS there something going on with the calipers?

Cavitation ???

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A Dalton

yes, it sounds like the rotors are scored that's what I mean by cavitation.

Oh...I see,
You kinds threw me there....
Cavitaion is when the hydrylics are cavitating b/c of a mixture of air/vapors with the fluid when under pressure .


If your rotors are scored I would be looking at possible brake hose constriction or caliper binding..not fluid cavitation.
[ or cheapo brake pads]

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A Dalton

Hearing a cavitation wouldn't cut it for me - I want to see it with my own eyes. Then I'd probably want to rename it. Sadly not all brake shops all impecably honest on these things. Rear brakes get so little wear it's unimaginable that you have damage on your rear rotors in 7k miles, especially with soft dealer pads. In any case you need a second inspection/opinion, starting with confirmation that the noise is coming from the rear.

Thanks for the info. Must be something going on with the calipers.

I replaced the rear rotors because the shop said they were being scored (as explained by the dealership). When driving at high speed I cold hear the breaks making a noise (a cavitation like sound, for lack of better word to describe it). I replaced the pads and rotors with MB dealership parts and they sounded fined, But now I think I'm hearing it again after only about 7k miles.

So there must be something going on with the calipers, but was just wondering if there was something else I should have done besides changing the pads (i.e. lubricating any moriving parts, etc.).

Also, I think I'm going to look into getting the older rotors turned as they seem to be acceptable (thickness wise).

Thanks for the info.

mayr71, you may need new rear brake hoses. Older, collapsed brake hoses prevent the caliper piston(s) from retracting properly resulting in premature wear of the brake pads ... or there is rust between the piston and caliper bore preventing the calipers from functioning properly.

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Fred Hoelzle