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      08-19-2020, 09:24 PM   #1
WDE82
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128i Stock Pads/Rotors Results

I thought this might be mildly interesting for a few people here so I'm posting these images.

These are my "Genuine BMW" pads and rotors for my 128i after about 40K miles. I did probably 6-8 autocross days (~70 runs @ 50s-60s each) and Tail of the Dragon once. No track days. After the Tail, the brakes were smoking visibly and that was quite early in their life.

I absolutely destroyed the fronts. The rotors are insanely grooved and the pads are cracked down the middle. The wear wasn't bad. They're probably 50% through their useful thickness.

Anyway, thought it was interesting. Let's just conclude that stock pads and rotors are not suitable for even highly spirited driving on the street much less autocross and definitely not HPDE/trackday.









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      08-20-2020, 11:01 AM   #2
NorthernDancer
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It's the autocross. I had my rotors & pads done at 41651 miles. Garage wanted them done just before a BMW Club HPDE. Pads I think were still 50-60%. All in all the pads & rotors still looked perfect. No HP driving to this point.
I too have done the Tail of the Dragon [2016] but likely never used the brakes as I was going slow. I did not want to ever get too close to the center line b/c a motorcycle may be coming the other way, very fast and hugging the center line.
I now have 63,544 miles on the car and the front brakes [Cool Carbon] therefore have 22134 miles. They have 3¼ HPDE days on them. They measure 8mm and have some slight evidence of heat crumbling so will keep an eye on them.
So my car now has 63,544 miles, it's an 08 but it's winter stored every year for 4-5 months so useage wise, it more like a 2011 or even 2102.
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      08-20-2020, 05:25 PM   #3
Olgeezer1
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Didn't care for the stock setup either. Worked fine on the street for me but faded really quickly when pushed / HPDE day. If the new Cool Carbon ST Plus is available for the stock caliper/rotor you might try those. Seem to be an improvement on the original ST's and their reputation for heat crumbling. I upgraded to the BMW big brake kit (basically 135 6piston Brembos, at least at the front) and the new ST Plus. Definite improvement. No noticeable fade in 30 min. session, low dust, very little to no noise.
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      08-20-2020, 05:58 PM   #4
WDE82
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Quote:
Originally Posted by Olgeezer1 View Post
Didn't care for the stock setup either. Worked fine on the street for me but faded really quickly when pushed / HPDE day. If the new Cool Carbon ST Plus is available for the stock caliper/rotor you might try those. Seem to be an improvement on the original ST's and their reputation for heat crumbling. I upgraded to the BMW big brake kit (basically 135 6piston Brembos, at least at the front) and the new ST Plus. Definite improvement. No noticeable fade in 30 min. session, low dust, very little to no noise.
I've installed F30 335i front calipers and rotors and E90 328i rear calipers (42 mm pistons vs 40 mm stock) with Ferodo DS2500 pads. Should solve all issues hah.
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