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  #1  
Old 07-20-2014, 11:40 PM
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Brake calipers frozen vs leaking, rebuild kit needed?

I am going to start a full brake job in the 1991 560sel soon. I read somewhere on the forum a post that said if brake calipers are frozen they MUST be replaced, a rebuild kit will not repair the problem. OTH, if they are leaking, then a rebuild kit will fix the problem. Is this information correct?

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Old 07-21-2014, 12:09 AM
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For the most part, yes, correct. When frozen there can be damage to the piston - corrosion or otherwise. It would be difficult to clean the piston and still make a nice seal.

Leaking is just a seal problem, so easy to resolve.

Honestly given the price of rebuilds, I went that route. Sure, costs more, but then its just a swap and go. And if you run into issues trying to rebuild on your own, you are stuck at square one. Thats a problem if a daily driver.
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Old 07-21-2014, 03:21 AM
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Indeed a bit of a generalisation - you can't really tell until you take something to bits...

...but generally speaking by the time you start to see a problem then it is often too late (especially if you live in a moist part of the world like me) to save the caliper.
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Old 07-21-2014, 04:51 AM
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I bought my calipers for my w126 at autozone 4 years ago.
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Old 07-22-2014, 10:43 AM
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Reman all the way. Let it be someone else's liability. When I had a shop, I refused to rebuild brake calipers due to the liability involved. I also will not sell a used brake caliper or master cylinder for the same reason. Just my 2 cents.

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