Are my rotors OK?

Phil G · 03-30-2011, 06:42 PM

OK, so I just took my car in for service today for a brake fluid flush, scope, replace and reprogram HPFP under recall. I told the SA to not worry about the front rotors (I was planning on fixing myself later). I measured them when I changed my pads myself and they were below minimum thickness.

However, when I picked up my car, they said the rotors looked fine. Do I really not need to replace my rotors? I thought when they were below the thickness stamped on the rotor and they have grooves, they need to be replaced.

e90pilot · 03-30-2011, 06:54 PM

BMW pads last a long time and have soft rotors so they tend to really wear the rotor since the pad is on there so long. You can change your rotors later but they probably want last through another set of pads.

kevin@bavarianx · 04-01-2011, 02:50 PM

I would recommend you change your rotors as it is past the minimal thickness. Brakes are a heat bank and they require mass to store that heat and use it as braking force.

03-30-2011, 06:42 PM	#1
Phil G Dominator of Deep South curvy roads 57 Rep 340 Posts Drives: '07 335i Coupe Join Date: Apr 2006 Location: Atlanta, GA iTrader: (0)	Are my rotors OK? OK, so I just took my car in for service today for a brake fluid flush, scope, replace and reprogram HPFP under recall. I told the SA to not worry about the front rotors (I was planning on fixing myself later). I measured them when I changed my pads myself and they were below minimum thickness. However, when I picked up my car, they said the rotors looked fine. Do I really not need to replace my rotors? I thought when they were below the thickness stamped on the rotor and they have grooves, they need to be replaced. __________________ -'07 335i coupe (build date 02/2007) - Space Grey/Black Dakota/Dark Burl - 6MT/ZPP/ZSP/Nav/CA/Heated Seats. Acquired in Munich 3/2007 via European Delivery. 16 years and almost 220k miles of pure joy! -'06 911 Carrera S - Black/Black - Full Leather/Sport Chrono/Porsche Sport Exhaust/Nav - 80k miles. Acquired 1/2021. One needy old German car just wasn't enough!
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03-30-2011, 06:54 PM	#2
e90pilot Freight Dawg 107 Rep 2,103 Posts Drives: E90 325i Join Date: Jul 2005 Location: Oakland, CA iTrader: (3)	BMW pads last a long time and have soft rotors so they tend to really wear the rotor since the pad is on there so long. You can change your rotors later but they probably want last through another set of pads. __________________ --Marcelo '06 Arctic Metallic 325i \| Sport Package \| 6MT \| Dinan Stage III suspension \| Dinan exhaust \| 330i manifold swap! Click here! \| Active Autowerke tune \| 135i Brake Calipers \| Deiselboost caliper brackets \| E46 M3 front rotors
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04-01-2011, 02:50 PM	#3
kevin@bavarianx Banned 33 Rep 812 Posts Drives: E36 M3 Join Date: Jul 2010 Location: Brea, CA iTrader: (3)	I would recommend you change your rotors as it is past the minimal thickness. Brakes are a heat bank and they require mass to store that heat and use it as braking force.
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