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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Fri, Oct-29-2010, 08:09:15 PM   #1
M///Fanatic
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Default A little guidance needed on caliper piston removal...

Hey, any suggestions on how to remove the piston from the caliper in the picture below.
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Old Fri, Oct-29-2010, 08:11:02 PM   #2
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http://bmwe32.masscom.net/sean750/ca...akeCaliper.htm

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If you use compressed air to remove the piston you can remove the entire caliper right now by rotating the caliper as you loosen the brake line. If you don't have a compressor, place the caliper on a sort of dish or something like that (to catch the lost brake fluid), and depress the brake pedal a few times. The piston should pop out. If you use compressed air, be careful using it, as the piston will be forcing out with some serious pressure. Place a piece of wood between the piston and the inner flange of the caliper, or use a rag. Don't use your fingers.
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Old Fri, Oct-29-2010, 08:28:24 PM   #3
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Originally Posted by BHenderson View Post
Thank you I read through it, but it doesn't describe or mention how to remove the piston.
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Old Fri, Oct-29-2010, 08:29:29 PM   #4
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Thank you I read through it, but it doesn't describe or mention how to remove the piston.
Mine seems to be stuck.....
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Old Fri, Oct-29-2010, 08:38:37 PM   #5
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Compressed air won't do the trick?
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Old Fri, Oct-29-2010, 08:41:07 PM   #6
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Originally Posted by BHenderson View Post
Compressed air won't do the trick?
my apologies thank you.
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Old Fri, Oct-29-2010, 08:46:44 PM   #7
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Default I just rebuilt my old 911...

calipers, and compressed air did not do the trick for me.

I had to remount the caliper on the chassis and use hydraulic pressure. I re-installed 1 brake pad (on the free piston side) and a thin piece of wood on the stuck side to prevent damage to my rotor when the piston freed up and spit itself out. The hydraulic pressure pop's em loose every time....
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Old Fri, Oct-29-2010, 09:02:10 PM   #8
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I plan on doing a caliper rebuild eventually. Would I have to bleed all 4 brakes afterward or just the brake that has had the caliper removed?
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Old Fri, Oct-29-2010, 09:15:40 PM   #9
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Originally Posted by mlminor View Post
calipers, and compressed air did not do the trick for me.

I had to remount the caliper on the chassis and use hydraulic pressure. I re-installed 1 brake pad (on the free piston side) and a thin piece of wood on the stuck side to prevent damage to my rotor when the piston freed up and spit itself out. The hydraulic pressure pop's em loose every time....
This is what I just tried and did not have any success, I read that the pressure should pop it out but this did not happen for me.
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Old Sat, Oct-30-2010, 05:39:59 AM   #10
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Compressed air won't do the trick?
word ..
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Discussing A little guidance needed on caliper piston removal... in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)