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Posted by: Eddie914 Aug 31 2010, 08:41 PM

New Zimmerman front brake rotors were just installed on my 914/6 3.2 (conversion) DE car. It is using 911SC brakes front and rear with Porterfield R4 race pads.

The old rotors had developed a bad vibration and were worn beyond spec after 5 years of track use, so no chance of having them turned (again).

Should the rotors be run in with new pads or old (60%) pads.

I will be attending a DE day on friday and the new pads need to be heat cycled before the event.

I do not think it is advisable to heat cycle the new pads on brand new rotors.

Your opinions, experiences or expert advise is appreciated.

Thanks in advance.

Eddie

Posted by: sww914 Aug 31 2010, 09:03 PM

Use the old pads first. It always works better.

Posted by: Eddie914 Aug 31 2010, 09:15 PM

How long does it take to "bed in"/"break in" the new rotors?

Track day on friday. There is a track day tomorow but I CAN NOT make the morning (VERY important business meeting).

Thanks,

Eddie

Posted by: Eric_Shea Aug 31 2010, 09:17 PM

Nada... use your new pads as "both" need to be bedded in/seasoned properly "together".

http://www.pmbperformance.com/page/page/1492423.htm

Posted by: jt914-6 Sep 1 2010, 04:36 AM

When you buy a new car does it come with used pads???