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08-24-2011, 08:17 AM | #1 |
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Front Rotor
I noticed that the front rotor is very different from the rear rotor on my 2011 Z4 - see the attached picture. I never read this in the brochure, but is this a floating rotor with an aluminum hub? The rear looks like a standard all steel rotor.
It is a very impressive piece of hardware. |
08-24-2011, 08:54 AM | #2 |
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It is not a floating rotor. It is a aluminum hub riveted to the steel/cast iron rotor.
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08-24-2011, 11:37 AM | #4 |
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Isn't this the EfficientDynamics feature for the Z4? Something to do w/ energy being created whenever we hit the brakes and it being used elsewhere. The amount of energy created is really miniscule, but better than nothing.
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08-24-2011, 09:13 PM | #5 |
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Probably partially for aesthetics - so you don't see a rusty hub through the wheels. Engineering wise to save unsprung weight. In a ground vehicle with a suspension, the unsprung weight (or the unsprung mass) is the mass of the suspension, wheels, brakes, rotors, and other components directly connected to them, rather than supported by the suspension.
The unsprung weight of a wheel controls a trade-off between a wheel's bump-following ability and its vibration isolation. Bumps and surface imperfections in the road cause tire compression—which induces a force on the unsprung weight. The unsprung weight then responds to this force with movement of its own. The amount of movement, for short bumps, is inversely proportional to the weight - a lighter wheel which readily moves in response to road bumps will have more grip and more constant grip when tracking over an imperfect road. For this reason, lighter wheels (and lowering the unsprung weight) are sought especially for high-performance applications.
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HerrK - 2021 X5 40i M Sport l PCD l Atlantis Blue/Ext'd Tartufo Merino l M Sport w/blue Calipers l Matt Popular l HK Sound l 740's l Exec & Drive Pro Pack Sold w/Great Memories - E89 Z4 l ED 2010 l 2011 35i l Crimson/Ext'd Coral Red w/Alum l 6 sp MT l Prem Sound l Sport Pack l 296's |
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08-25-2011, 04:04 PM | #6 | |
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Quote:
They claim it helps fuel mileage. If the battery is low, the charging is normal. If the battery is fully charged, it is maintained at that level during deceleration.
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2011 35i 6-speed, ///M Sport, Deep Sea Blue, Black leather, Carbon trim, Cold Weather package, Premium package, 6CD changer. Delivered 7/15/11. Michelin Pilot SuperSport tires 10/24/12 Tucson,AZ/Santa Paula,CA |
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09-01-2011, 11:34 AM | #7 |
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According to the technical manuals link in one of the recent posts - the front rotors are:
Aluminium floating calliper brakes or aluminium frame calliper brakes (top models, sDrive30i, sDrive35i) are fitted on the front axle. I was right! See attached manual - P 19. |
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09-01-2011, 11:54 AM | #8 | |
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Quote:
btw I posted those manuals.
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2011 35i 6-speed, ///M Sport, Deep Sea Blue, Black leather, Carbon trim, Cold Weather package, Premium package, 6CD changer. Delivered 7/15/11. Michelin Pilot SuperSport tires 10/24/12 Tucson,AZ/Santa Paula,CA |
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09-03-2011, 02:06 PM | #9 | |
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Below are some pics of 1) 1 pic of a one piece hub/rotor - cheapest to make, 2) 2 pics of a fixed/bolted rotor (front/back) which for discussion is the same as riveted, and then 3) 2 pics of fully floating hub rotors. It has a relatively small pins and allows for the disk itself and the hub to remain separated for heat dissipation.
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Last edited by teagueAMX; 09-03-2011 at 02:53 PM.. |
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09-03-2011, 03:29 PM | #10 | |
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As I and others have tried to explain the rotors are not floating. Yes, the calipers are floating. That is the common design for most mass produced automotive disc brake systems. Fixed calipers on the other hand have pistons on both sides of the rotor are more standard in high performance or racing applications. Fixed calipers & floating rotors are usually synonymous in the same way as floating calipers and fixed rotors. Although sometimes they are mixed. BMW's statement is kinda like bragging they supply their cars with nitrogen inflated pneumatic tires. Sounds high tech no? Marketing 101. If you can't baffle em with brilliance, befuddle them with bullshit. Sorry for your befuddlement.
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