Front Calipers sticking - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 04-09-2013, 11:31 PM
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Front Calipers sticking

Greetings,
I was wondering if anybody had both their front calipers seizing at the same time. I took the calipers off and the pistons pushed in pretty easy.
Any suggestions and ideas are appreciated.
Thanks
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#2 (permalink) Old 04-10-2013, 05:27 PM
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Welcome to Bimmerwerkz.

I have had my Right Front (RF) caliper stick on me causing pulling when braking. This is something you should look at pretty quickly if you live in an area with moisture (rain/snow/etc). The reason they stick is their is a rubber gasket seal around the piston, and over time this can tear or rip allowing mositure in. When this happens rust will form causing the sticking most people experience. If caught early enough the caliper can be rebuilt with a kit ($15-20) and the piston can be salvaged. If their is exessive pitting and corrosion on the caliper, the entire thing will have to be replaced as the piston is not sold seperatley. The piston needs a good smooth surface to seal properly.


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#3 (permalink) Old 04-10-2013, 11:35 PM
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Thanks Lord Vader,
What puzzle me is why both would seize at the same time? A friend of mine suggested flushing the old oil and changing the flex hoses, but I guess with the salt in Ottawa all the bleeders will be seized so I guess I will dudge the bullet and change all four.
Thanks for your help, all the best
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#4 (permalink) Old 04-11-2013, 08:49 PM
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Hard to say why both would sieze together, which is why inspecting the calipers is important. It may have been that both calipers have ripped piston seals. If the Master Cylinder were bad i believe it would effect all four and not just the fronts.

One thing you can do is replace your brake lines with Stainless Steel (SS) lines. People report a better feel under braking with them, and they will last longer then OEM brake lines. If your gonna change all four you may as well swap in SS lines while your at it IMO.


I feel ya on the salt. They have been adding more salt on our roads here in Calgary. I had to stop driving the E36 in the winter as its getting to many rust spots on the hood from being peppered.


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