Xeros

I was actually just wondering about the EVO and Sti brembo brakes, I know that they are 4 pot calipers up front and 1 pot in the rear but compared to the 99spec FD brakes, how do they match up are they bigger, are the discs larger, are they better quality? How are they compared to our stock brakes?

Black91n/a

I do beleive that they're 2 piston rear calipers. They're about 12.7" front and about 12.3" rear disks. They're Brembo, so they've got excellent quality. I can speak from experience riding in an STi around a racetrack while it was driven at 10/10ths by an instructor with over 30 years of racing experience that the brakes are amazing. They strow you into the seatbelts with more ferocity than anything I've ever experianced and it feels like they'll stop the earth from rotating.

Xeros

so better then our stocks? I was reading up on the 350z ones and apparently theyre not all that impressive, and I believe they use the same ones as well. They were testing stop tech upgrades and these other big brake kits too . apparently they arent a super improvement over the regular brakes. And you are right i was mistaken by saying one piston in the rear, i ment two, one on each side. So do you think fitting a set from an STi onto an FD woudl be worth it? Or is just better to go brembo big brake kit?

DamonB

Absolutely not. Even after you make some sort of adaptors to get the calipers mounted the rotor dimensions between the hat and disc surface will be different not to mention the bolt circles are different as well too I believe.

Just buy a brake kit made for the FD. No sense in wasting any time trying to piece something together from other cars.

DamonB

You felt tires, not brakes.

poss

iTrader: (5)

The STI bolt pattern is different, but supposedly the EVO is the same as the FD.

IMO, if you are planning on tracking the car, get a real big brake kit. However, if I came across and extra set for really cheap, I'd probably experiment with mounting them to the FD, just for the hell of it if nothing else.

Xeros

Actually, POSS, thats what i was thinking baout, you can pick up a set of all 4 wheels for about 1000 on ebay.... I saw some of the silvia guys fitting on subaru brakes and figured eh can't hurt to ask around here.

this auction is standing at 760.00 right now and figured hell if they are that much better i dont see why not try and take the time to fit em.

http://cgi.ebay.com/ebaymotors/2005-...20475872QQrdZ1

I dont liek being a cheap bastard either when it comes to my car but to dish out 2k for bigger calipers just for the front...man it kinda hurts you know?

rynberg

First, you don't need bigger brakes unless you are tracking the car regularly...

Secondly, you shouldn't just be trying to bolt on calipers designed for other cars! The piston sizing could be dramatically different, they could be sized for a different bore master cylinder, etc., etc. You would likely lose braking balance by just trying to adapt brakes from another car.

If all you care about is looks, then go for it, but if you actually care about balanced and good braking performance, then don't. In another words, they are NOT necessarily better than the stock brakes, and may actually REDUCE braking performance (other than fade resistance).

Xeros

I see, thanks for the information Rynberg. Also maybe you can clear it up for me, do brake kits change braking bias? As I posted before I was skiming through an article on a site that a lot of people refer to for brake info and they said that diffrent kits caused diffrent break biasis. I can remeber the site off the top of my head nor can I i find it in my history again. My seven is being built mainly for competition purpose so yes, there is a reason I woudl want a bigger brake kit. About the master cylinder, couldn't I just go with a 929 master cyclinder that a lot of people use to with big brake kits and a portioning valve could I not? I'm not the the type to care about looks much at all, sure my car doesn't show it but that was done for other reasons, mainly as a show car for my shop and my own creative skills with cars. Do keep in mind though that my car has been striped bare on the inside and all over to minamize weight.

eastcoastbumps

iTrader: (1)

Look into Stoptech if you're going with a BBK. I've got a set on my WRX and they've been flawless. There are several racers in my club that have upgraded their brakes and they have all gone with Stoptech. My brother also races a WRX and uses Stoptechs. He is dropping down to a less compeditive class for next year. He cannot keep his aftermarket Stoptechs and must use an OEM brake system, so hes going with STi Brembos. Hes not looking forward to the change in brake setups.

Stoptech also engineers all their kits specificly for each car so that brake bias is not changed.

DamonB

From our sticky at the top:

Everything about Brakes by Grassroots Motorsports A must read!

Xeros

damonB it doesn't work. But i think I have read that page before. I belive it explains all the parts of the brake system and how it works and that a bigger kit wont stop you faster and what not and that a bigger BMC won't either its all just forces and what not, i read all that(if thats the page). And I know that it really all depends on how good your tires are too. Half the reason I posted this question becasue I think my right caliper is going to **** itself real soon, becasue it seems to be a little odd when I bleed the lines, it always has a ton of air, more than any other caliper and it also gets air back after I bleed the entire system..I dunno its odd. I've posted on this problem before I was just wondering if i could go a diffrent route with a diffrent system.

eastcoastbumps

iTrader: (1)

Air should only be able to get into the brake system through the master cylinder if the fluid resivior is empty. (or if you're not bleeding the system properly.) Pressure will push fluid out through leaks giving you a soft pedal and new fluid should be drawn in through the master cylinder. It would only pull air in through a leak if you had a clog or blockage between your master cylinder and resivoir or if it was a massive leak, but then you wouldn't have any pedal at all.

Xeros

I know its really odd I am telling you guys I bled the system at least 20 times last summer, each time the system ended up nice and hard for about 5 minutes and then softened up drastiucally after a while, it was realllly pissing me off. I bled the BMC at least as many times and even ordered a rebuitl one, and it still ahd the same dman problem.

DamonB

Is the brake fluid fresh?

Thanks about the link. I'll see if I can get it fixed.

Xeros

i used a whole new bottle of valvoline synthetic each time!!!

poss

iTrader: (5)

What method are you using to bleed it?

Xeros

well i bench blead the bmc a bunch of times then a i ble dit on the car. I bled the lines for all the calipers with regular nipples and speedbleeders as well. And everything was tightened to spec, odd thing was there were absolutely noo leaks anywhere when i checked aafter they softened up....

eastcoastbumps

iTrader: (1)

Have you removed the calipers to check the seals?

Xeros

on the pistons them selves yes.

rx7will

iTrader: (6)

If you have a new brake master cylinder and you have no leaks anywhere. Try replacing the caliper that always has air in it. I had the same problem and after changing the brake master cylinder i was clue less. I know that my right front caliper had some really dirty fluid but it did not leak. My problem was that every once in a while my brake pedal would be softer than normal, but after one pump the pedal would go back to normal. I recently upgraded to 99spec brakes, but i only did the fronts first. To see if i can eliminate the front brakes first. After doing the fronts my pedal is all back to normal. I cant really explain what the problem was but for my case change the calipers fixed my problem.

Xeros

damn it I figured it might be as much rx7will...It sounds just like my problem.....this car is ending up to be way too much cash..hell if I replace the front I'm just gunna go with a BBK.