autobonrun

I was researching considerations automotive engineers use in locating calipers. The calipers on the rear tires of both my 993 C4S and my 996 TT are on the front side toward the center of the car. However the calipers on the front tires of the 996 are on the back while those on the 993 are towards the front. I found this article and video interesting; only 17% of sports cars checked have the front calipers where the 993’s are; on the front side of the rotors. Not only that, for some reason the 993 calipers are up higher, when you really try to lower weights. I’m sure the Porsche engineers had a reason; not sure what it was. Maybe suspension or steering rack interference. Anyway I thought others might find this interesting. The video is short and gives some insight into considerations.

https://us.motorsport.com/automotive...plained/32439/



993 caliper location

pp000830

From my observations having worked for a brake system manufacturer the key is managing the interference of the caliper and its related connections to other aspects of the suspension ran into in the design phase of the wheel end. Unanticipated interference of parts in brake and wheel-end components is such a thorny engineering problem that 3D physical models are made just to validate that there are no problems. Beyond this, it simply may just not matter. Then again it is really hard to know what was going on in a German engineer's mind 30 years ago.
Andy

geolab

Since the 1970's , the reason in placing caliper at exact place is the maximum flow of air reached to the caliper AND disk temperatures, with each wheel design and under carriage air flow different from car to car
Differnt brake pressures front rear play with anti-roll. When you brake hard, the nose drops and rear lifts. whilst when you use only the parking brake while at speed, the rear drops