Drilled and slotted rotors are meant to evacuate the gasses that are produced between the brake pad and the rotor. This microscopic layer of gasses decreases brake performance. Slots and holes allow the pad to stay in better contact with the rotor by giving the gas a way out.

Ventilated rotors allow for better cooling by increasing the mass of the brakes and also increasing surface area.

Most front brakes are ventilated while the rears are not. If you want to more effectively cool your rears you should focus on ventilated rotors instead of drilled.

Since most drilled rotors are meant for high performance use they will also, most likely, be ventilated but that is not always the case. For instance, the Viggen's fronts are both slotted and ventilated but the rears are slotted only.

pmr
'99 9-3 Viggen
'99 9-5 SE V6

• Drilled rear rotors, great tires, WASSAAB, Mon, 4 Jun 2001 09:53:22
  • Re: Drilled rear rotors, great tires, GM, Mon, 4 Jun 2001 15:04:33
    • GM who has crossed drill rotors for 87's n/m, Mike 87 900s, Mon, 4 Jun 2001 15:51:09
      • Any of the saab vendors should, GM, Mon, 4 Jun 2001 23:21:40
  • Drilled vs. Slotted vs. Ventilated., pmr, Mon, 4 Jun 2001 13:29:16 <-- Viewing This Message
    • i second this, Gerhard, Tue, 5 Jun 2001 15:31:55
  • Bad brake proportioning valve?, REM in Seattle , Mon, 4 Jun 2001 11:46:11
  • Can't say the same for the Nitto's, as I'm sure you heard, Talladega900, Mon, 4 Jun 2001 10:56:12
  • Re: Drilled rear rotors, great tires, Kevin K , Mon, 4 Jun 2001 10:42:47
    • Considering the rear brakes were billowing smoke, WASSAAB, Mon, 4 Jun 2001 10:53:20
      • bias, Kevin K , Mon, 4 Jun 2001 12:05:03
        • That's what I thought; thanks for confirming it, WASSAAB, Mon, 4 Jun 2001 12:12:39
          • caused by backs locking..., Richard Miller, Mon, 4 Jun 2001 15:47:36
          • no,, Kevin K , Mon, 4 Jun 2001 15:04:25
            • Drilled vs. stock rotors, WASSAAB, Mon, 4 Jun 2001 15:23:34
              • Drilled vs. stock rotors!, Gerhard, Tue, 5 Jun 2001 15:29:52
              • Re: Drilled vs. stock rotors, Kevin K , Mon, 4 Jun 2001 16:14:40
                • OK, WASSAAB, Mon, 4 Jun 2001 16:59:28
                  • agree..., Kevin K , Mon, 4 Jun 2001 17:10:50
                    • to ..., GM, Mon, 4 Jun 2001 23:28:19
      • Dont know %, but fronts handle the lion's share...n/m, Talladega900, Mon, 4 Jun 2001 11:01:41
      • Re: Considering the rear brakes were billowing smoke, EricZ, Mon, 4 Jun 2001 10:56:02

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