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11-10-2008, 03:02 PM | #68 |
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Squeak - The OEM 135 brakes are Brembo. And if you are incinuating we should just buy aftermarket, to that I take a counterpoint. BMW was very strong in toting the Brembo 6 piston brakes throughout their marketing of the 135.
If they chose to market these brakes as performance equipment they should stand behind them (or in front of them at about 140mph) and make sure these brakes are robust enough to support their marketing claims. Mark M |
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11-25-2008, 12:42 AM | #69 |
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Ceramic has a very good capacity for handling very high heats, so the extra heat from race pads shouldn't cause the ceramic to crack. Ceramic does fracture very easily when jarred, however, so my best guess would be that the instances where the ceramic has cracked would be due to vibrations or jarring.
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11-25-2008, 10:50 AM | #70 | |
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11-26-2008, 02:39 PM | #72 |
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A common item is to use a titanium plate between the pad and pistons- Stoptech sells these. The use of the ceramic is likely an attempt at insulating heat transfer and thereby reducing the likelihood of boiling the fluid. Since these "pads" were prototypes, did they use the oem backing plate? If not, check the measurements against an OEM backing plate for variance. Also check on how well they were retained while and when installed- it happens.
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01-11-2009, 08:20 PM | #73 | |||
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The ultimate solution is to use calipers engineered properly such that the anti-knockback springs and/or pressure seals themselves do the job. And, the result of pad knockback is a pedal that needs to be pumped up after a hard corner, not additional heat. Knockback, while a royal pain and totally intolerable, would not contribute to the ceramic insert issue at all. Quote:
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Also, while aftermarket pads are not all the same, they can be made just as well as the OE pads as far as fit and finish goes (and there are plenty that are not!). Actually, there are aren't that many companies in the world that actually make brake pads as the equipment is very expensive and solely dedicated. Many brands are made by the same factory or set of factories. Of course, since the 135i is still fairly new, some race pad distributors have been cutting them from larger pads. They can get this right or they can get it wrong, so only buy from someone with a TON of experience in doing that job. |
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01-11-2009, 10:13 PM | #74 |
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Chris B, good to see an AP Racing expert here! All I can say is that the cracking piston issue has turned into a positive for me, as my replacement AP Racing caliper with much larger rotor is such an improvement on my car on the track! But of course, it has cost me an arm and a leg for the new brake set up. Btw, can you clarify for me the difference in AP and Brembo range? Are they totally different or do they overlap seeing that they are one company?
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01-11-2009, 10:59 PM | #75 |
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Don't go AP racing vs Brembo, since the Brembo guy will say they have brought AP and AP has inferior technology. It happened in the other forum .
I have medium term experience with AP and love it to death. Hence I supported you 100% WAY when you told me you are going for an AP caliper.
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01-12-2009, 01:21 AM | #76 | |
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They are essentially separate companies with a common owner since the chairman of Brembo led the purchase of AP Racing about 8 or 9 years ago. The intention then was to keep them separate, which has not changed as of yet. This keeps both on their toes as they compete fiercly with one another. Each has their strengths and weaknesses in their respective areas of focus, but both are excellent organizations. |
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01-12-2009, 06:13 AM | #77 | |
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Yes, they can induce drag (and the extra heat problems that goes with that), but frequently on a track the drag induced can be made up during the braking zone by the extra confidence the driver regains in their brake pedal.
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01-12-2009, 02:47 PM | #78 |
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Some people do find satisfactory results that way. But we should all understand that this is a band-aid, not a true solution. If it someone gets it all wrong, the "bang for buck" equation goes right out the window (and maybe into the K-rail!). Of course, we are all monitoring our brake temps on track days, aren't we boys and girls???:wink:
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01-23-2009, 07:10 PM | #79 |
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04-18-2020, 05:32 PM | #81 | |
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How many of each did you get for your rebuild?
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04-20-2020, 12:55 PM | #82 | |
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04-20-2020, 01:43 PM | #83 | |
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https://www.rockauto.com/en/catalog/...epair+kit,1720 The seals/boots shouldn't be different for the stainless/steel pistons vs the OEM style pistons right? The diameters etc are the same....so... |
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