Guest scca Posted November 16, 2001 Share Posted November 16, 2001 Tim, i guess i dont follow..... you still say the rears will lock first.. so where did i miss about the brake bias thing? Quote Link to comment Share on other sites More sharing options...
TimZ Posted November 17, 2001 Share Posted November 17, 2001 quote: Originally posted by scca: Tim, i guess i dont follow..... you still say the rears will lock first.. so where did i miss about the brake bias thing? Actually, I was agreeing with what you had said, and applying the same idea a bit further to address the brake bias question. Remember that the front and rear brakes are on seperate circuits hydraulically. So, while you've made the fronts 'mushier', the 'stock' rears act like they always did. It's important to remember that there are several variables to take into account when changing calipers. Increased caliper size/pad area on the same size rotor will not necessarily increase the max braking force in the front. It should, however, give you lower peak temps, due to the friction forces being spread across a gretater area. All of the big brake mods are there primarily to increase your braking systems ability to manage brake temps, which allow you to brake consistently, repeatably, and from higher speeds. They are not generally for increasing the max braking force - in most cases, the stock brakes would lock all four wheels, and any increased force is wasted beyond that. The problem was they would only allow a small amount of repeated use before fading, especially from high speeds. Quote Link to comment Share on other sites More sharing options...
260DET Posted November 17, 2001 Author Share Posted November 17, 2001 Fitting an adjustable proportioning valve into the rear brake circuit is, I think, supposed to reduce the tendency for the rears to initially tend to lock up. Correct me if I'm wrong, but such a proportioning valve does two things. One, it reduces the amount of pressure transferred to the rear brakes in a set proportion to the amount of pressure being applied from the master cylinder. Two, it adjusts the pressure threshold point at which the above begins to occur. Which I guess is why they are used in the rear circuit ie to counter the tendency for the smaller cylinder capacity rears to come on first. A stimulating discussion, fellow enthusiasts Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted November 20, 2001 Share Posted November 20, 2001 There are other parts of a brake system that have an effect on braking. Yes there is a proportioning valve, we all know of that. But many have a metering valve which delays pressure to the front so the rear can have a head strat. This controls front end dip. Quote Link to comment Share on other sites More sharing options...
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