11-03-2018, 10:05 PM | #1 |
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Minimum front disk rotor
Was wondering if anyone knows what the minimum front disk rotor size might be for an Msport 335. I've been trying to figure it out and it seems that there are different numbers.
I have found that there is a number stamped on the rotor somewhere but I am trying to avoid pulling the wheel off if anyone already knows the answer. I just did my rears yesterday and the fronts look as if I should do them in the next month--figuring I would do them before the sensor clicks and save changing that like I did on the rears. My rear pads (changed under warranty with the rotors) only lasted 20k miles so I did not change them but now my car has 46k miles on original front brakes. Since those rotors are not cheap if they are still spec I would prefer to not change them.
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2013 335i Msport Black sapphire/Coral red. MHD. stage 2--e30 VRSF DP, ER CP, Dinan Shockware. VRSF 12mm/15mm spacers. Cobra dashcam. Various codings.
Last car: 2011 335i Msport. JB4. Vrsf CP |
11-04-2018, 01:14 AM | #2 |
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The min. rotor thickness is stamped on the hub part of the rotor, usually next to the part#. Just keep looking around the hub(it can be on the side facing down). Also since both rotors per axle are identical, do search on both rotors.
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11-04-2018, 02:19 PM | #3 |
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I have not been able to find it. I found the numbers on the rear, but the front discs are a different design. I'm wondering if the stamp might be on the inside.
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11-04-2018, 02:47 PM | #4 |
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It should be listed here: https://www.newtis.info/
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11-04-2018, 02:59 PM | #5 | |
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Quote:
https://www.newtis.info/tisv2/a/en/f...kes/1VnXN0TRAm
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2013 335i Msport Black sapphire/Coral red. MHD. stage 2--e30 VRSF DP, ER CP, Dinan Shockware. VRSF 12mm/15mm spacers. Cobra dashcam. Various codings.
Last car: 2011 335i Msport. JB4. Vrsf CP Last edited by jgoens; 11-04-2018 at 03:10 PM.. |
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11-04-2018, 03:46 PM | #6 |
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So, in cross referencing realoem to see what disk I have it seems like I have this:
https://www.realoem.com/bmw/enUS/sho...49#34116792223 Though mine is not blue or ventilated--but the picture of the non-ventilated one looks like mine. In which case this would be a 340mm. I used a tape measure on my rotor and am getting 29-29.5 mm thickness which based on the TIS chart would be above spec as far as I can tell.
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2013 335i Msport Black sapphire/Coral red. MHD. stage 2--e30 VRSF DP, ER CP, Dinan Shockware. VRSF 12mm/15mm spacers. Cobra dashcam. Various codings.
Last car: 2011 335i Msport. JB4. Vrsf CP |
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11-10-2018, 06:16 AM | #9 |
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Normally when the pads are worn down (and I mean down to touching the pad sensor) the rotor is due to be replaced as well.
Mostly it makes no sense to put new pads to old rotors as you would have to change the rotors just a few thousand miles later anyway. Most shops recommend to change the pads far before they are even close to the pad sensor. Which is completely out of sense for normal street use. I have 35 tsd miles now still 1st pads/rotors on my 2013 335i. I know I will have to change pads in about 3tsd miles. Sure I will change rotors as well and I won't have to touch the brakes for the next 35-40 tsd miles.
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335i F31 RWD in SB || Powertrain: Active Autowerke Flash Tune Stage 1 | AA Charge Pipe | AA FMIC | GFB DV+ | xHD Trans-Flash | Quaife LSD | Cyba 3.5" Carbon tips || Chassis: 20" 405M | Wiechers Strut Bar | Rear M-Diffusor || Brakes: 18" M-Perf Brake orange 370/345 | EBC YellowStuff pads all around || Various: LED bulbs: Fog-L. front | Turn Signal f&r | Brake L. | Reverse L. | Rear L. | Rear Fog L.
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11-10-2018, 07:56 AM | #10 | ||
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11-10-2018, 12:00 PM | #11 | ||
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I was getting some squealing from the rears which I did last week and yesterday did a bed in process which so far has taken the squeal out. Despite the fact that I drive very light on the brakes, my pads wear out fast due to the constant stop and go driving I do. It it is very rare I do a hard stop or heat things up and this is why I think my rotors are in such good shape yet the pads wear out quickly (20k).
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2013 335i Msport Black sapphire/Coral red. MHD. stage 2--e30 VRSF DP, ER CP, Dinan Shockware. VRSF 12mm/15mm spacers. Cobra dashcam. Various codings.
Last car: 2011 335i Msport. JB4. Vrsf CP |
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11-11-2018, 03:52 PM | #12 |
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"Minimum" defines the point when you have to replace the rotor, not where it should be after resurfacing and putting new pads on!
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335i F31 RWD in SB || Powertrain: Active Autowerke Flash Tune Stage 1 | AA Charge Pipe | AA FMIC | GFB DV+ | xHD Trans-Flash | Quaife LSD | Cyba 3.5" Carbon tips || Chassis: 20" 405M | Wiechers Strut Bar | Rear M-Diffusor || Brakes: 18" M-Perf Brake orange 370/345 | EBC YellowStuff pads all around || Various: LED bulbs: Fog-L. front | Turn Signal f&r | Brake L. | Reverse L. | Rear L. | Rear Fog L.
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11-11-2018, 05:08 PM | #13 | |
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If it's below minimum before or after resurfacing it should be replaced. The point of being sure the rotor measures at least 1mm more than minimum before resurfacing is so you won't waste time and money on a resurfacing job that would probably take the rotor below minimum. If you want to be cheap you could not bother to resurface rotors that don't have enough material to resurface them, or replace them either, but that leads to the next scenario:
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11-12-2018, 02:53 PM | #14 |
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Billfitz Even if you still have 1mm left to minimal thickness after resurfacing, this will be gone in a few thousand miles. For me it is wasted money to resurface a rotor that has 40k miles or more and is close to it's end.
I think resurfacing makes sense, where one would (for whatever reason) change the pads in use, with other new pads. I.E. after 15k miles and you decide to go for a more agressive pad. Let's say, I'll keep my 5 year old car for another 5 years. I have to change the rotors anyway sooner or later. So I change them the same time the pads are down and fine I am for another 5 years not wasting money on resurfacing. (dimpled / slotted rotors, as I have, should have enough deep dimples and slots anyway. Therefore I wont resurface them anyway. But that's another story than flat surface rotors)
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335i F31 RWD in SB || Powertrain: Active Autowerke Flash Tune Stage 1 | AA Charge Pipe | AA FMIC | GFB DV+ | xHD Trans-Flash | Quaife LSD | Cyba 3.5" Carbon tips || Chassis: 20" 405M | Wiechers Strut Bar | Rear M-Diffusor || Brakes: 18" M-Perf Brake orange 370/345 | EBC YellowStuff pads all around || Various: LED bulbs: Fog-L. front | Turn Signal f&r | Brake L. | Reverse L. | Rear L. | Rear Fog L.
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11-12-2018, 03:36 PM | #15 |
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11-13-2018, 09:18 AM | #16 |
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