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Re: Cross-drilled, slotted, or stock? (archive)

[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]

Posted by t_tice on November 21, 2000 at 22:56:41:

In Reply to: Cross-drilled, slotted, or stock? posted by doug on November 21, 2000 at 17:58:18:


I have used several sets of the ATE powerdiscs as well but on an E30 325iS. I used them for daily driving as well but the real benefit was for track driving. I typically would warp a set of rotors for each weekend on the track. With the powerdiscs, the warping problem disappeared. I would be hard pressed to say that these discs actually improved breaking but the theory is that the groove (or slot or cross drilled holes) allow gases to escape keeping the pads in more complete and continuous contact with the rotor. I seemed to recall that the powerdiscs were only marginally more expensive than standard rotors where slotted or crossdrilled were significantly more. The only downside is that they are a bit noisier under heavy braking.

Tom Tice
'93 525i
'98 M3/4
'99 540/6

I am curious about the different types of brake drums available and if they make a whole lot of difference for non-racing driving (normal driving). I want to make my car as safe as I can and spending a some extra money to do so really doesn't bother me.

Cross-drilled, slotted, drilled and slotted...I know they help dissipate heat and water and should reduce fade if in situations of heavy, extended braking periods (mountain driving), but what about pad life and do I really gain that much improvement?

What about drilled vs slotted vs drilled and slotted? Any comments, suggestions, brand recommendations?


'95 525ia

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