Bad Caliper already?!?

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Doing simple rear pad/rotor change on my 2012 C30, only 90,000 miles.

Turn right side piston back in, no issue.  Turn left side piston back in, brake fluid comes out of boot. Its definitely leaking now, so seal is bad.  Wasn't leaking before brake job.


My 1997 850 with 205,000 miles still has original calipers!!


Does this different design, instead of just pushing back pistons, cause failure more often?  I wonder if turning the piston can tear old seals.



Edited by BlackBrick
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2012 MY is a 9 or 10 year old car now.  Caliper seals generally fail from corrosion happening inside the caliper, usually from water condensing in the brake fluid.  Owner is supposed to completely flush the brake fluid throughout the whole system every 3-5 years to avoid this problem happening.  If it's never been flushed, or maybe only once in its lifetime, then yeah, I could see a corrosion problem cropping up.

And don't EVER sell your 850, but it may be due for a brake fluid flush?   :cool:

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Yeah, i flushed it once since owning it in 2017, I'll bet I was the first one to do it.

Still, seals shouldn't go that easy.

My 850 Wagon I will forever keep!

My 850R Sedan i sadly had to scrap last year.



Edited by BlackBrick
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