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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 Mon, Aug-04-2014, 12:50:47 PM   #1
chriskuta
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Default Rear Porsche caliper question?

I'm having a fitment issue with my rear Porsche calipers part numbers 996.352.421 & 996.352.422 using the new rally road rear brackets. The problem is that the two guides for the pads bottom out on the rotor.

I've noticed in photos of these fitted that the guides are flush with the caliper face


Mine (not flush)


It looks like these guides can be moved? Any ideas how to get the little securing pins out? Do the guides have notches in them for different depths?

The pad on the face side is also pretty tight too, but once the pads bed in, it should be fine.
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Old Mon, Aug-04-2014, 01:13:58 PM   #2
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Default Re: Rear Porsche caliper question?

Hello, When I did mine they were the same way, what I did is I took a c lamp and pushed it out to the point it was flush with the caliper its really easy when you apply enough force it will move out, it does not have any notches it is tightly fitted. I did mine before I painted the calipers so I don't have to worry about damaging the paint, if you already painted calipers just put some rubber pad under the clamp and you should be fine otherwise paint will get damaged.
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Old Mon, Aug-04-2014, 05:09:42 PM   #3
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Default Re: Rear Porsche caliper question?

Interesting. Mines were also flush like your first pic:

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Old Mon, Aug-04-2014, 07:44:57 PM   #4
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Default Re: Rear Porsche caliper question?

That's is weird. I use the p0lar brackets for the rear. I read the proper bracket with the caliper is pretty forgiving on different types of rotor. Like the Pfc rotors. The front are usually the ones that come too close to the rotors and sometimes require shims. I would ask p0lar about this to see what are some options.
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Old Mon, Aug-04-2014, 08:04:15 PM   #5
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Default Re: Rear Porsche caliper question?

I think it's really hit and miss. I know with P0lars brackets, you're supposed to be able to flip them around if you wanted to run larger discs and calipers. But I had to run mines in that flipped orientation to clear my caliper guide pins already even though mines are technically the smaller calipers.
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Old Mon, Aug-04-2014, 08:25:00 PM   #6
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Default Re: Rear Porsche caliper question?

I have used P0lar brackets and they don't have anything to do with guides I guess some Porsche calipers guides are more pushed in than others, but that's nothing to be worried like I said it is easily adjustable.
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Old Mon, Aug-04-2014, 10:08:58 PM   #7
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Default Re: Rear Porsche caliper question?

thanks for all the replies, I'll have a go at moving those guides further out. I'm on oem rotors so it should be all good. I'd rather not shim the bracket if possible.

Did you guys find the outer pad was a snug fit?
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Old Tue, Aug-05-2014, 10:36:40 AM   #8
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Default Re: Rear Porsche caliper question?

Hey guys, sorry to be so late to this party (and a LOT of PMs.. I'm getting there!), but you're very correct about some of these calipers having odd spacing of the internal pad resting pins.

From the plethora of calipers I've seen/handled/modified, not only is the internal spacing different from caliper to caliper, but also the overall length of pin. Bear in mind that the same part number has different casting revisions and that they're present on quite a few different models. ALSO, of important note, is that not all M3 hubs and bearings are the same. The european cars almost all seem to need about 1.5mm of material removal to center the caliper over the rotor. This has caused some consternation when going from a floating-caliper to a fixed-piston arrangement. I've even seen some individuals who have had a hub bearing replacement report issues. (One side fits, the other doesn't!)

The floating calipers can accommodate a fair amount of variance in bearing/hub tolerance whereas the fixed piston calipers center on the hub based on a fixed distance from the carrier. I've run into even more problems when people start using very thick pads, very thick rotors or rotors that have higher diameters than the factory ones. I'm not sure why those issues aren't more commonly sighted as almost any one of those seems to cause headaches for the installer.

At any rate, if the pins are too close to the rotors, you can trim them with a die grinder, angle grinder, etc.. carefully, but you really can't move them unless you drill out that hardened set pin, press them into position again and re-set a new pin. Trust me, it's not worth the effort!
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Old Tue, Aug-05-2014, 01:33:47 PM   #9
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Default Re: Rear Porsche caliper question?

That is interesting, My pins were to close and I was able to press them in with c-clamp vice grip without any grinding, drilling etc. its a very tight fit even after being pressed in pins are still tightly fitted to the point where it cannot be moved under any circumstance while on the car. Procedure took me about 5 min per side its not very hard to do once you have right tools (C-clamp vice).
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Old Wed, Dec-24-2014, 12:55:30 AM   #10
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Default Re: Rear Porsche caliper question?

I had to trim them with angle grinder here.
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Discussing Rear Porsche caliper question? 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)