[mkeiser]

UPDATE:

I've decided to go all in on f30 335i front calipers and e90 328i rear calipers... Here's the breakdown of everything so far.

$243.28 - f30 335i front calipers (ebay)
*ended up breaking the bleed nipple on drive side caliper trying to remove it and was unable to salvage it... rookie mistake!!!!
-$118.94
**seller ended up refunding me

$118.13 - another f30 335i front caliper (ebay)
$109.51 - autofren rebuild kit

$62.70 - e90 328i rear calipers (ebay)
$117.22 - autofren rebuild kit

$64.99 - g2usa caliper paint kit

$296.95 - z4 3.5is front rotors, 128i rear rotors

$263.78 - hawk hps 5.0 front and rear pads

$108.94 - bimmerworld stainless steel brake line kit

$1,266.56 - TOTAL

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ORIGINAL:

I'm in the beginning stages of planning to replace pads and rotors on my 128i. The car is still my daily driver but a few autocross events a year, and I'm hoping to hit a track day or two this year but we'll see about that.

I currently run a set of 16" wheels in the winter and stock 17" in the summer. Depending on the brake route, I may be able to change that up to 17" in the winter and 17/18" in the summer. I also have been using ATE 200 brake fluid.

I've researched the usual brake caliper upgrade suggestions... e90 335i fronts / f30 335i fronts and e90 328i rears. But I'm wondering if I can just get by with my stock calipers and upgrade the rotors / pads / fluid to something that is able to hold it's own with more spirited driving events.

So I guess my question to y'all would be if I could get by with something like stock rotors (or upgrade to drilled/slotted?), upgraded pads (hawk yellow, ferodo ds2500?), and upgraded fluid? Or should I just aim for upgrading the calipers and go all-in?