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      07-11-2019, 10:07 AM   #8
dradernh
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Drives: 2017 M240i
Join Date: Aug 2013
Location: Ohio

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Quote:
Originally Posted by xingqianli View Post
Wow that looks even darker than mine seems we do need better cooling. anyway I won't care too much if it's only about the look.
It's not likely to be restricted to the look. The caliper pistons' dust seals become hard and brittle once high-enough temperatures are reached. If my calipers become discolored, the first thing I'm going to do is have the shop pop the pistons out to look at the seals.

Another member here didn't just discolor his calipers, he destroyed them. His piston seals were ruined, and the pistons distorted such that they no longer moved back and forth in their bores. He had to buy new calipers.

Part of this issue is down to how the driver is using his or her brakes. Some drivers, novices especially, but some others as well, are not efficient brakers, and they end up putting much more heat into the system than is necessary. That's not going to turn out well on heavy, powerful cars like ours when they have no brake ducting to the center of the rotors.

Tracks make a difference, too. Heavy-braking tracks, for example, exacerbate this problem. I run on a track with what I consider to be only moderate-braking demands, and I'm getting my components much hotter than I'd like to see.
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2017 M240i: 23.6K, MT, Sunroof Delete, 3,432#, EB, Leather, Driving Assistance Package, Heated Front Seats | Sold: E12 530i, E24 M635CSi, E39 520i, E30 325is, E36 M3 (2)
TC Kline Coilovers; H&R Front Bar; Wavetrac; Al Subframe Bushings; 18X9/9½ ARC-8s; 255/35-18 PS4S (4); Dinan Elite V2 & CAI; MPerf Orange BBK; Schroth Quick Fit Pro;
GTechniq Crystal Serum Ultra Ceramic; Suntek PPF
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