GF calipers VS. BF calipers-- FIGHT!

[scottzg]

ok, sort of an impreza question, but its legacy-related and i despise nabisco, so its here instead.

Does the 95 impreza L wagon with safety package (one item is rear disks) have the same caliper pistons as the legacy sedan, or wagon? I'm nearly certain its one of the two. And, what are those piston diameters again?

Because i know you're dying to know why im curious, i want to tip the bias back in said impreza-with-wrx-brakes cheaply w/o a double diagonal killing bias valve, and if BF calipers do it, BAM! success.

[dscoobydoo]

Ok, I can't find ANYTHING on a rear caliper for the 95 Impreza L Wagon.

I would suggest the turbo rear calipers if you want to push for something to push more on the rears.

I don't think the Legacy would have that much bigger calipers than the Impreza.

[scottzg]

off memory

the wagon piston diameter is the same as the turbo. The bias valve is the differences between SS, W, and TW, the SS has sedan bias valve and big pistons, the W the wagon valve and small pistons, and the TW has wagon has wagon valve and the larger rear pistons.

Turbo brakes aren't necessary for my application. With knowlege of what the imp wagon has, i can tune with cheap parts and said info.

[greg donovan]

what about changing the rear pads to amore aggresive compund?

[scottzg]

tuning with pad compound es no bueno.

Just because a pad is designed to operate at a higher heat range doesn't mean they're more abrasive, and the brake bias will change as the pads warm up at different rates. I'd rather kill the redundant brakes with a bias controller.

bias controller, calipers, or new pads should all run ~50$. Why do it wrong?

[greg donovan]

i think you should go all out and get a tilton dual master cylinder set up w/a balance bar.

then you can tune away.

[scottzg]

Got my answer- the impreza wagon has the same calipers as the legacy wagon. Damn.

[totech]

How about the newer 00-04 Legacy rear discs - they are larger, use the same caliper, and all you really need is a caliper bracket and rotors..

They are supposed to be better than the smaller RS and turbo Leg discs.

[jamal]

You need new calipers and brackets to go the 00-04 Legacy route, because the style of the caliper changed, so our rear calipers won't work with the newer brackets. I'm sort of considering doing the bigger rears, and if I did, I'd probably just buy the rear calipers off the guy I got the fronts from, and find some brackets somewhere. There's a place (wrxparts?) that sells the brackets and discs as a package.

[scottzg]

How about the newer 00-04 Legacy rear discs - they are larger, use the same caliper, and all you really need is a caliper bracket and rotors..

They are supposed to be better than the smaller RS and turbo Leg discs.

not looking for bigger brakes, looking to tip the bias back on the current brakes.

[Legacy777]

How about the newer 00-04 Legacy rear discs - they are larger, use the same caliper, and all you really need is a caliper bracket and rotors..

They are supposed to be better than the smaller RS and turbo Leg discs.

not looking for bigger brakes, looking to tip the bias back on the current brakes.

bigger rear brakes WILL tip the bias back....

[scottzg]

Not in this case, they use the same caliper with a larger rotor. As there is no more pressure applied to the pad, it won't change.

[jamal]

Doesn't the longer moment arm move the bias rearward some?

[skid542]

Yes.

[Legacy777]

Not in this case, they use the same caliper with a larger rotor. As there is no more pressure applied to the pad, it won't change.

Wrong.....it'll change

Brake Torque = force * distance

Force = same
Distance is greater then before, brake torque increases, and will affect bias.

this spreadsheet gives you quite a bit of different brake swapping scenarios.
http://main.experiencetherave.com:8080/ ... kemath.xls

[scottzg]

yeah, i caught that after i said it.