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Originally Posted by Cloudsurfer
The key to effective brake upgrades is maintaining brake balance front to rear, which the better kits do (think StopTech, Brembo, AP Racing, etc). Race cars work around this by having cockpit adjustable brake bias valves, but on a street car, you want to maintain the factory balance front to rear. So, if you increase braking power 40% up front, you need to add 40% to the rear.
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this statement is a bit misleading. let's assume that by 'increasing braking power by 40% up front' that we actually have the grip to do this. what happens under full brake load? the nose dives and the rear lifts. when we lose weight at the rear of the car, we lose grip & in turn, braking capability. it sounds counterintuitive, but adding braking capability to the front of the car requires a DECREASE to braking capability in back to prevent rear-bias lockup.
that having been said, street cars are fairly front biased for this reason. accordingly, one can get away with adding LOADS of front braking capability and the rears don't lock up unnecessarily. with race rubber, a problem MAY develop, but it's easily remedied by running different compounds front to rear.
finally, ABS can deal with these mods without any real problems in most cases. issues DO develop if you run tires w/ markedly different grip front to rear.