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M3 Track: Racing and DE Best mod for speed is learning to get the most out of what you currently have. Tracks and DE's is the place to start!


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Old Mon, Oct-05-2009, 02:42:41 AM   #11
alanbmoore
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Next question - what happens when the boot tears? It shouldn't leak fluid, but I'm sure it can damage the bore and piston seal eventually. How did you catch it?
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Old Mon, Oct-05-2009, 03:59:27 PM   #12
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i just found a tear in my rear passenger boot, was planning on hitting the track one last time this Friday, is that a no-no with a torn boot ?
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Old Mon, Oct-05-2009, 04:47:15 PM   #13
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I would think you are fine as long as you rebuild it before the next time you push the piston back into the bore. (like is done when you replace pads)
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Old Mon, Feb-01-2016, 01:43:05 AM   #14
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Default Re: Who's replaced the rear caliper dust boot on their M3 ZCP?

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Originally Posted by ZCP M3 View Post
How did you get the dust boot to "snap" onto the rear caliper? I've destroyed two already trying to get that stupid thing on.
Apparently you need BMW special tool PN 83300492459... but getting the tool is only half the battle, once it arrives I will have no idea how to use it... stay tuned, maybe it's obvious
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Old Sun, Feb-07-2016, 05:56:10 AM   #15
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Default Re: Who's replaced the rear caliper dust boot on their M3 ZCP?

Well, the tool that I ordered over a week ago still hasn't shipped, but I was able to get the calipers rebuilt in the mean time with the help of the fine folks at Edge Motorworks in Mountain View, CA. Here is the contraption they came up with (on the coffee table in their lounge, on their lunch break!!) that saved the day.

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Old Mon, Feb-08-2016, 07:54:34 PM   #16
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Default Re: Who's replaced the rear caliper dust boot on their M3 ZCP?

Easiest way is to insert the dust boot to the back of the piston (not in ridge yet), then insert boot into caliper, then align piston and push into caliper and the boot will snap into ridge when piston slides in.
Just keep the piston lubed w fluid and it's a piece of cake
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Old Tue, Feb-23-2016, 02:35:01 AM   #17
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Default Re: Who's replaced the rear caliper dust boot on their M3 ZCP?

Hairspray. Works like a charm.
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Old Sun, Jul-10-2016, 06:41:11 AM   #18
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Default Re: Who's replaced the rear caliper dust boot on their M3 ZCP?

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Originally Posted by bngl3rt View Post
Well, the tool that I ordered over a week ago still hasn't shipped, but I was able to get the calipers rebuilt in the mean time with the help of the fine folks at Edge Motorworks in Mountain View, CA. Here is the contraption they came up with (on the coffee table in their lounge, on their lunch break!!) that saved the day.

Can't see your pic. Did you ever get the tool?

Sounds like you can only order the rebuild kit from the dealer, correct?

I know you can get ATE (OEM) front rebuild kits but I haven't seen the rear kits
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Old Mon, Jul-11-2016, 05:12:07 AM   #19
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Default Re: Who's replaced the rear caliper dust boot on their M3 ZCP?

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Originally Posted by Hit_Apex View Post
I would think you are fine as long as you rebuild it before the next time you push the piston back into the bore. (like is done when you replace pads)
I have driven a track weekend with torn rear boots - I saw them too late, and figured will keep an eye on it. I had one caliper slightly sticky and my one rotor glowed during the day, literally. once pad ware out and the piston moved out a bit, it was okay.

apparently, after rebuild (including new pistons), it was obvious these boots must have been broken for a while and rust had gotten in, and after I pushed piston in to make space for beefy track pads, the rusty part of the piston was right in the seal, and the caliper was sticky...

those things are obviously important, and like hitapex said, you may be okay as long as you don't press in the piston to change pads..



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