19th August 2008, 00:28
M5 Guru (>2000 posts)
Originally Posted by Mposter
Any "front only" big brake kit will upset the brake bias. The main objective with massive brakes is consistency and fade resistance - not necessarily reduced stopping distances.
Swapping out the proportioning valve, or getting an adjustable one will alleviate this.
Four-wheel BBKs are a waste of money as the rear wheels do hardly any braking, so nearly any stock caliper is sufficient. In fact, the increased unsprung weight will possibly reduce overall performance of your car.
-You're right on the money except for two potential factors:
1) Some BBKs decrease unsprung weight even as they increase the size of components.
2) Some 4 wheel BBKs are significantly more useful than a comparative 2 wheel BBK. This is quite dependent on the vehicle in question and it's spring and longitudinal roll rates. Ideally, you would reduce load transfer to the front as much as possible and thus maximize all four contact patches instead of planting all the load on the front tires. If you can use more rear tire, then more rear brake helps. Stronger rear brakes, in some cases, can even help to reduce load transfer and also allow more control of the car's axis under braking (brake steering).
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