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04-03-2013, 10:52 PM | #1 |
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135i Racing Brake Piston Upgrade
If you track your car, then do this! No driving impressions yet, but you'll see from the pictures just how bad my stock pistons were. I let them get way beyond what they should, mostly due to laziness and I was getting away with it. But last time out, I ruined a set of pads from uneven wear, due to the deterioration of the pistons.
Took about 6 hours with pad replacement. Links to what I purchased: FRONT KIT REAR KIT Process: No information on how to uninstall/install brake lines and calipers, there's plenty of that in this site or e90 sections. 1) Get car up on jack-stands (all four wheels at the same time preferred). 2) remove brake line from caliper 3) remove caliper from hub 4) remove pads from caliper 5) use compressed air (90 psi) or so through the same whole brake line plugs into. This ejects the pistons. I used carpenter clamps to hold the other pistons in place while ejecting one at a time and replacing. Otherwise only the closest piston to the air will eject. 6) remove dust seal/boot 7) remove pressure/oil seal 8) install new pressure/oil seal 9) place new dust boot/seal onto new piston neck (there's a slot that it falls into) 10) Install new piston with dust boot at the same time, and make sure boot falls into caliper slot. 11) repeat steps 5-10 for each piston (best to do one at a time) 12) install pads 13) install caliper to hub 14) install brake line 15) re-fill/bleed brake fluid system 16) blah blah, you get it. Car still on jackstands, because almost through the process I forgot that I ran out of brake fluid.. [dumb move] Packaging Nothing fancy, but well put together and prepped. Each set of pistons and seals had their own sub-compartment within the bag. overall packaging Seals and Boots Pistons Install This is what the front caliper looks like with beat up stock pistons Picture 1 Picture 2 Side by side comparison of new stainless-steel piston and stock one. No idea how I was breaking like this, all of them were this bad or worse. Compressed air through pictured slot to eject pistons. Make sure to put about 1" to 1 1/2" inches of cardboard infront of the piston you're ejecting, it comes out rather quickly and with force. Removing the dust boot, use any thin flat-head screwdriver, or something to fit in and pull up. To remove the pressure seal, use the same tool and essentially place it behind the seal, and pull out. Once there's enough of the seal out of the slot, remove with fingers ore pliers. Install the new seal into the same slot, kinda of a pain, tedious, not hard. Here's the new piston with the dust-boot/seal attached, this goes into the caliper together. Then, the boot fits into the same slot as the one removed earlier. Once done, it should look something like this. --------- Here's what the six pistons from the driver side front caliper looked like. No pictures from the rear, they weren't nearly as bad, but still should be done. The process is the same, just less work, only one piston on each side of the caliper, bigger piston, whole and easier to work with. --------- If you decide to do this, do at your own risk.
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Last edited by yandy; 04-04-2013 at 08:02 AM.. |
04-04-2013, 05:16 AM | #2 |
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I was already planning on doing this. They should have come from BMW with this 'mod' done.
While we have the caliper off the car, can anyone explain what the 'legs' of the caliper do? The 2 bolted on extensions at the respective ends on the outside of the car.
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04-04-2013, 09:17 AM | #3 |
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Nice write up Yandy! I've had mine in for a while now and I love em. I have the fronts only though, but I've found that there is much better pedal feel. Did you also get the larger front rotors with the bracket??
MLSavage, the bolted extentions are there for vibration control. I took mine off and haven't experience any difference. Takes a bit more than 1lb of unsprung weight off the car.
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04-04-2013, 09:35 AM | #4 | |
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04-04-2013, 11:02 AM | #6 | |
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04-04-2013, 11:46 AM | #7 |
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Just left the holes open. If they get filled up i'm sure they can't be cleaned out with some compressed air and water hehe. Cosmetic wise....you can't see them once the wheels are on unless you're really trying to look for it. Nobody really even noticed i took them off out of my friends that really know my car either.
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04-04-2013, 09:43 PM | #8 | |
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04-05-2013, 08:35 PM | #9 |
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finally got my RBF 660 in and the mid stainless-steel lines. I had done the others, but never the "mids", now I know why. What a pain in the ass those things are in this car, but got them done anyways.
Just bedded my new RP2 Carbotech pads, didn't crash, car stops fine, so I think it's good for now.. lol I'll post up more/impression as I drive around with them.
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04-06-2013, 10:15 AM | #10 |
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Wow, those look awesome. I've been considering doing this upgrade next time I change pads/rotors. I didn't know RB made a kit though. What made you choose theirs over the ones originally discovered here:
http://www.1addicts.com/forums/showthread.php?t=441050 Looks really nice, you will have to keep us posted on the performance. Those brittle stock pistons have got to go! Tim
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04-06-2013, 11:31 AM | #11 |
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I think its cost.
The stop tech link you refer to has sub total of $510.00 vs RB $475.20
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04-06-2013, 12:45 PM | #13 | |
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Either way, with a piston upgrade and some quality pads and fluid, it looks like you could make a very good improvement to the stock brakes! Tim
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04-06-2013, 06:06 PM | #14 | ||
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04-06-2013, 06:13 PM | #15 |
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Got the RB upgraded pistons too, as well as the larger front rotors... Will be put on in a couple of weeks when I get back into town. Can't wait.
Yandy, how are you liking the Carbotech's? |
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04-08-2013, 08:18 AM | #16 |
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You're going to love that combo. I just did a full weekend at the track with that kit (3rd weekend of tracking) and so far everything is holding up great. The rotors still look really good. My calipers are a solid gold from the heat but no issues inside
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07-13-2013, 02:43 AM | #18 |
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Think this might be my next upgrade now that I have a good deal more power than stock. I have 27k miles on my car... how long till I should look into new brake pads?
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07-14-2013, 02:01 AM | #19 |
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I've only done the fronts, now looking at the rears. Just clicked your link to that site and it says the package is to rebuild 2 calipers, ie left and right rear. How come there is only 4 pistons? Sorry if my math is way off, but I thought our rears required 4 for each caliper?
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07-14-2013, 03:46 AM | #20 | ||
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07-14-2013, 07:57 PM | #21 |
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Can you link me to the video?
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