Quote:
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Originally Posted by swamp2
Quote:
Originally Posted by gee-m-w
Ceramics are the only thing that can take the heat and dissipate it.
If you have steel this fire goes right into your wheel bearings and melts the grease:
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Utter nonsense.
You know that CSiC brakes being significantly lighter in turn have less thermal mass, right? Lower thermal mass absorbing the same amount of energy makes for a larger temperature rise. Now that's not the end of the world as the first thing temperature will affect will be braking power from a pad that can not maintain friction at a very high temperature. Luckily that is always sorted out well with a CSiC brake rotor as it has a pad matched to the temperatures that will be generated.
In addition, BMW has for generations, used a compound brake rotor on M cars. These have the actual brake disc mounted on pins connecting to a lightweight aluminum hub.
This allows for radial thermal expansion with much less tendency to warp. It also radically reduced the thermal pathway to the hub preventing temperatures in excess of what the wheel bearings can handle.
Really the only way to cook wheel bearings on an M car is one and/or the other of:
-Really poor braking skills or downright abuse
-Running R-comp tires, that is what will really give a brake system a workout
CSiC brakes make more sense for a lightly used street only car. In that case it is not so much braking performance that is gained but simply longevity and a lower unsprung weight. At the much higher temperatures seen during tracking the wear in the CSiC even with their appropriately matched pads is significantly accelerated. Thus for hard use and to minimize total long term cost, the regular cast iron rotors come out way ahead.
As others have stated the best upgrades for braking are simply some upgraded pads, some top notch brake fluid and R-comp tires.
Carry on... |
Well said! Sigh.....but he'll retort until he's blue in the face.