Date: 3 Jun 2006 12:45:23 GMT From: Dave Hinz <DaveHinznospamcop.net> Subject: Re: Brake Pad Recommendation For 1996 9000 CS
On Fri, 02 Jun 2006 18:15:23 -0400, Fred W <Malt_Houndnospamm-me-not*yahoo.com> wrote: > DFRANet wrote: >> I thought they stay cooler as a general rule.............. > I'd say not. Why would they? Because the cross-drilled holes create an air column. The air absorbs and then disperses the heat, carrying it away from the rotor. > Since you have reduced the contact area of the pad's limited dimensions, > in order to get the same friction (and stopping force) you have to > squeeze the pads to the calipers *harder*! The force exerted per square > inch of surface is greater and therefore more heat will be generated. > There would be marginally more surface area (for heat dissapation) I've seen a really good writeup of the thermodynamics involved, but it's been a few years. Made sense to me at the time and I was freshly out of thermo class at the time. "Wizard Words" maybe? > I > guess, but the real issue is peak heat (and heat > variations/fluctuation), not average value. The heat builds much faster > than you can shed it on just about all braking systems. THe crossdrillings give the air somewhere to compress to instead of making your pads float on the rotors, and when those heated columns of air are released (you can hear it), they carry away heat for you.
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