:P OK folks, here it goes.....Pick-n-Pull 1/2 price today, so that means I'm that much closer to 4 wheel disks on my xB. YEA!!!!! :D I got the disks and the calipers and wheel studs. I wont say what its off of yet just in case it doesnt work, but as soon as I'm done I'll let everybody know what I did and how. I think this will work pretty good, and should look pretty good. What a tease huh? I'm gonna try to work on them this week, I'll keep ya posted and I'll be taking lots of pics. See Ya, Louie,

ADDED 6/1/04 BY ADMIN:
This is some photos a the rear disk brake conversion I did on my Scion xB. I used the calipers and rotors off the rear of a Toyota Corolla GT-S (aka. EA86 Trueno....I think). The swap was a lot harder than I thought it would be, as most every part had to be modified in some fashion. I made my own caliper brackets and mounted them between the rear swing arm and the wheel hub. This gave me a bonus 3/8" spacer to move the rear wheels outboard. These calipers have the e-brake built into them, but I havent hooked that up yet, as the cable ends differ from the xB to the GT-S. I hope to have that problem rectified soon. Other than that the brakes work great, and look really kool, (very stock looking). The best part about this was I hit a local Pick-n-Pull half price day, and the swap cost me about 40 bucks. Thanks for surfing in...Slopoke21m

http://www.scionlife.com/tech/images/braking_reardiskconv/01.gif

http://www.scionlife.com/tech/images/braking_reardiskconv/02.gif

http://www.scionlife.com/tech/images/braking_reardiskconv/03.gif

http://www.scionlife.com/tech/images/braking_reardiskconv/04.gif

http://www.scionlife.com/tech/images/braking_reardiskconv/05.gif

http://www.scionlife.com/tech/images/braking_reardiskconv/06.gif

http://www.scionlife.com/tech/images/braking_reardiskconv/07.gif

http://www.scionlife.com/tech/images/braking_reardiskconv/08.gif

Well kinda messed with them tonight.......oh thought this was the g-string thread :? jk
Acctually was kinda sizin stuff up earlier, I dont think its gonna be quite the direct bolt on affair I had hoped, but I think its still doable. And a byproduct of this swap may be the rear wheels may end up pushed out about 3/8 of an inch without the use of spacers....woo hoo! I think the toughest part is probably gonna end up the damn E-brake cable, oh well. Welp I'll keep ya posted. See Ya, Louie 8)

P.S. So far I've got bout 30 bucks invested....

:D well, so far so good, got the brakes on and working, and took a 4 hour road trip.
no probs. the conversion was more complicated than i had hoped, and i still have the e-brake to hook up. it looks really kool and factory. i'm putting together a parts list and a description of what i did, so keep an eye on this thread. here is a link to one pic so far...more to come.http://hometown.aol.com/slopoke21m/xbbrakes.html

See Ya, Louie 8)

nice job louie!

well, guess I'll need two sets of parts now!

let me know when you get all of the parts/numbers figured out.

squirrel

Well done. I cant wait to here what car you used to pull parts from. Thats awsome.

What size is the rear rotor? Is it vented or solid :)

well here is some info:
*the donor car: 1988 toyota corolla gt-s
*the parts taken from car: rear rotors (10" solid), rear calipers, (and shouldve gotten the dust shields but didnt)
*used xB stock rear hubs but had to trim the spokes around the studs so it will slip into the rotor
*had to trim the center hole on the rotors to fit over the xB hub
*had to trim the mounting boss on the calipers so it would mount to the new mount
*had to fabricate new mounts for the caliper. they use the 4 mounting holes for the stock hub, (my mount was made out of 3/8" plate, a little thick, but the mount is placed between the swing arm and the hub so...... my rear wheels are now space out that much now...yea) also those 4 mounting bolts need to be 3/8" longer than stock
*stock studs were the same length as the gt-s so didnt change them
*still havent hooked up the e-brake cable, i think thats gonna be the challenge :roll:
:? this ended up a lot more complicated than i figured. not exactly what i would call a bolt on swap. I'm not really recommending doing rear disks this way, because of all the cutting and trimming. But maybe someone out there can take this and come up with a better way. I dont know, maybe this will be the easiest and cheapest way to do this, if it is I will help the best I can. I am pretty happy with the end result though, it matches the front pretty good, and when i get the e-brake done that will be a nice bonus that aftermarket racing calipers dont have yet. I figured I would tackle this project because i've done something very similar to my 64 chevelle ss and my dirt racecar.....but those were easy compared to this. Anyway, i'll post more info as i get it and im gonna go to kragen and get their part numbers and prices for the rotor and caliper, and if i get a real good template made maybe i can help out with that or making the mounts or a whole kit or something. Have fun, See Ya, Louie 8)

Louie, I hope you got my PM on how to hook up the E-brake. I should know because I used to have a 1989 Toyota Corolla ( TRUENO, AE92, 4AF) I sold mine to get my XB, and it was the SR-5 Model so I got the same set-up for disc on it. PM me if you need help!

NICE!

are you using an additional proportioning valve to compensate for the drum pressure coming from the mastercylinder?

Again, i admire your dedication and desire.

I can maybe help everyone out. If you know the center hub hole, I can find a rotor that will fit without modification. I can probably also find a caliper that may fit better. I just took a quick glimpse into toyotas parts bin and there are a plethera of stuff that may work. Even some vented rotors. :)

:D thanx for all the input and atta boys :D
lets see......
*nope no additional proportioning valve everything seems to be working ok, I was a little worried there may be a check valve somewhere in the drum brake sys (there usually is), but if there is it seems to have no effect on the rear calipers. they dont seem to be dragging.
*dont remember the exact size of the center hole on the rotor, but if you have access to a parts resourse, i'm sure there may be some more suitable parts out there somewhere. vented rotors would be cool, but would definately not work with these calipers, they are too narrow.
*i havent taken apart the front brakes, but if the rotor is not part of the hub, the rotor and the front caliper may be a very easy install (keeping in mind the e-brake would be history)
*i so screwed up with the dust shields (kicking myself in the ars)i went back for them, but pick-n-pull wanted 10 bucks a piece for them (not half price anymore) and considered them backing plates. so i didnt get them, then changed my mind and went back for them....they were gone....guess theyll see the light of day again as a can for some refried beans or somethin...man i am so cheap :evil: well thanx again...
See Ya, Louie 8)

Dont worry about the dust shields, really not important. Especialy where we live. I dont have the front or rear set on my s2000, but then again, i am running 6 piston caliper s up front with 14" rotors and 4 pot calipers with 13" rotors in the rear. They actually run a lot a cooler without the shields. Only in plces where they salt the roads is it something to worry about.


If you have your stock drums you should be able to get the center hole on the hub. With that, i may be able to start eliminating some stuff. What would obviously be the best solution is something that is readliy available and cheap. Some of the corolla stuff may be more expensive. Im going to take a look at some of the mr2 stuff as well as a few other little pocket rockets from japan and see what i can find.

Youguys bring up a valid point though about the proportioning. This is something that really does need to be taken seriously. You really want to make sure that you r rear brakes do not lock up before your fronts.

The deal with the dust shields is purely asthetic, they would make the whole brake package look larger and fill the wheel a bit more and more resemble the fronts. I really notice the difference between the front and rear now, and the gt-s dust shields i think were identical to the fronts in the way the edge was rolled.....still kickin myself!

I had never really laid on the brakes until after changing the rears so i dont have any comparison to draw on, but i took it down the street got to about 55 or so, let off the gas made sure i had a good handle on every thing and just slammed on the brakes, the pedal was very firm, moved about another 1/4 inch and the thing stopped on a dime!!!!! never felt anything like it before, was very impressed. :shock: The tires never even chirped, but i think i may have set off that stability control beeper, dont really know though, i heard something. We have a 97 cavalier and the pedal pulsates alot from the anti-lock sys this thing was solid. Thanx again, See Ya, Louie 8)

alright, bringing this back up.... has anyone found any parts that will match up better? I'm looking to do this myself and matched up parts would be awesome..

Do you want function or do you want the style of 4 wheel disks. If you want function you don't need disks on the rear, just install Porterfield R4S pads on the front and send them some rear shoes and have the R4S material installed. AutoX and street braking will be equal to disks, road course with higher heat for longer time would require rear disks.

You won't have the cool factor but you will have more $$ in your wallet.

Throw in some stainless hoses and you will out brake 95% of the cars out there.
ken

hey louie, did you ever get the e-brake working? Still a great modd!

hey louie, did you ever get the e-brake working? Still a great modd!

gabe, louie got it hooked up. he posted the info on a new thread.

I feel that This was needed

http://www.scionlife.com/forums/viewtopic.php?t=5183&highlight=

Great job with the mod!

you mention that the e-brake line is not the same on the scion as the Mr2, What did you do to fix that?

Hey guys....a few days ago I was talking to a rep from Willwood...I asked he they had a rear brake kit to go along with the front brake kit they sell ( a lot of the S.E.M.A xb's had willwood's)...it's funny cause he laughed....said something like what's the need of rear discs in this car.......I like them for the looks...but his point was the Hp and weight of the Xb there was no need for them.....I guess he has a point.....with the 4 disc brakes you will have no trouble stopin :D

Click on the scroll down menu & check it out:

http://highonscion.com/chassisProducts.htm

Does anyone have this? If so, how about a review? Thx!

would you be interested in refabbing those mounts and shipping em to me. if its not gonna cost too much id like to do the same thing

Well theyre officially done...and kids dont try this at home. Not a damn thing fit the way it was supposed to. All I had left to do was hook up the E-brake and put the dust shields on behind the rotors. Still working with all the parts off a 80somthing GT-S coupe the brake cables were a pain to get to work, but after fabbing a bracket and routing the cables they finally worked. And the dust shields that I thought would just bolt in placed, required some severe reworking. But alas....hopefully I can say the 1st xB in the US (if not the only) that has 4 wheel disk brakes with a working e-brake. Oh well even if not I like the look, but wouldnt do it again....so the wifeys xA is stuck with drums.... See Ya, Louie

How's the brake feel now that you have 4-discs? Think you'll have any probs with the master cylinder not being proportionate?

They feel great, just like stock. The proportioning seems to be OK. I figured that maybe the ABS would compensate for any differences, it seems to be just fine. Stops pretty good. See Ya, Louie

Click on the scroll down menu & check it out:

http://highonscion.com/chassisProducts.htm

Does anyone have this? If so, how about a review? Thx!
thanx for the info i will have to check these out

Can anyone get any info on the Highonscion.com page?

Did u ever try using the e-brake cable from the Toyota Corolla and see how that works

I had thought of this a week or two ago, but not wanting to mess with a perportioning valve and such, I decided against even thinking it! Good job on it....But, I have to ask....What about the perportionong valve....AND the anti-lock brake system? I would be SCARED TO DEATH wondering if I didn't make myself a DEATHTRAP!
I am not flaming you by ANY means...but I gave up on the idea for my safety, not my inability. Could you fill us in on these things?

please make and sell me another set of brackets and include a parts needed list

I had thought of this a week or two ago, but not wanting to mess with a perportioning valve and such, I decided against even thinking it! Good job on it....But, I have to ask....What about the perportionong valve....AND the anti-lock brake system? I would be SCARED TO DEATH wondering if I didn't make myself a DEATHTRAP!
I am not flaming you by ANY means...but I gave up on the idea for my safety, not my inability. Could you fill us in on these things?
having extra rear brake would make driving odd but would not be unsafe after a few short trips worth of familiarization.

^^^ I didn't see it anywhere, but does doing this mess up the ABS, Traction control, Stability Control...Etc.?

it wouldnt mess with stability or trac. could mess with abs tho.

the abs unit would be working out of it's normal operating range. but if u were to use a proportioning valve it should be fine.

Just a thought, but when I was into drag racing, the choice, if possible, was drum brakes because the disk brakes are always in contact with the rotor where as the drum brakes were not touching the drum. Is this true? By retrofitting rear disks, are we adding (although slight) more drag to the car?

Just a thought, but when I was into drag racing, the choice, if possible, was drum brakes because the disk brakes are always in contact with the rotor where as the drum brakes were not touching the drum. Is this true? By retrofitting rear disks, are we adding (although slight) more drag to the car?

I don't think it would drag the car down to a apoint where it would adveresly affect the performance of the car but you are adding more stopping power. I always say "you give little , you take a little"

drums provide better static grip at the line in drags (in case you wanted to hold the brake pedal and spool a turbo or leave at a certain rpm) Drums also usually use a residual valve that holds a little pressure in the lines to overcome the return springs (helps them react faster, similar to the discs). If a car has this valve and you convert to disc, it will hold the pads against the rotor slightly. Not sure if the scions use them or not, though.

discs usually slip under the drag racing conditions listed above, but are better for high-temp (speed+duration) stopping, like a road course (or NJ highways...) :nails:

You definitely get an "A" for effort... but I would say this modification is mainly looks... I know Disc brakes are better stopping power under certain conditions, etc. But most of your stopping power is in your front brakes obviously, the rears work for balance.
And whoever said that the brake pads are touching slightly at all times needs to NOT believe everything s/he hears

^^^ I am the one who said the pads are 'always' making contact with the rotor. This was embedded into my brain from my drag racing buddies...and you know what? I just did a quick search and found that they DO always touch.
So, maybe I can believe some of what I hear? Unless someone explains to me otherwise, I'll have to stand my ground on this one. Check it out for yourself! There is no mechanical device built into a brake system that pushes the pad away from the rotor after you take your foot off the pedal. I read numerous forums and they ALL say the same thing...the pads DO stay in contact with the rotor.
As far as any major 'drag' from this, well, that has been answered in this thread as well. It isn't enough to worry about.

they shouldnt, think about it... if theyre always in contact, then theyll wear out super quickly... anyway... try slipping a piece of paper between your pads and rotors (when theyre cooled of course) see what happens

Drums have springs that pull them back away from the drum slightly. It was never said that there was 'major' pressure on them, just a little parasitic drag from them rubbing on the rotors. Like I said...Do a google search for it...you'll find it's more common than you think.

yes i will stay with x_rayted on this one as well,,, I guess u have never changed a set of pads on disc brakes? why else would u have to push the piston back in the caliper for the pads to fit back on the rotor? It is true...

hey question, when you did your disc conversion, where did you get the caliper mounting brackets from?

hmmm wish this guy was still around

Just a note, the ae86 had a solid rear axle and hubs would not be compatable. Those were most likley sourced from an ae92 front wheel drive corolla gts or an fx16 gts corolla.

man i want to do 4 wheel disc!

Just a note, the ae86 had a solid rear axle and hubs would not be compatable. Those were most likley sourced from an ae92 front wheel drive corolla gts or an fx16 gts corolla.


I said that already on page 1, I owned the same car that he louie took the brakes off of. :D I remember talking to him about it when he was installing them. I had a 1989 Toyota Corolla GTS coupe. These are not very popular so you should be able to find them in the junk yards still. The engines are about the only thing that everyone takes.

http://www.precisionmuffler.com/0a8af430.jpg


P.S.
He made the caliper mounting brackets himself in his shop.

has anybody check out to see if we can rip the front brakes off our xB;s and mount them in the rear.... this would be cool, and then just save up 4 a while n get some wilwood big brakes up front...

^^^its not that easy. the front brakes are too big for the rear, and you would still have to come up with a caliper mount. And there would be no parking brake.

^^^its not that easy. the front brakes are too big for the rear, and you would still have to come up with a caliper mount. And there would be no parking brake.

Yeah, the parking brake is the big thing here as well as the mounting bracket. Randode hit the nail right on the head.

i guess were gunna have to deal with the drums.... i just regret painting them bright red, because now they stand out.... maybe ill get them powdercoated black, and pretend they are never there... haha

i guess were gunna have to deal with the drums.... i just regret painting them bright red, because now they stand out.... maybe ill get them powdercoated black, and pretend they are never there... haha
or do like I did for a while, and run the fake ones:
http://www.autochamps.com/sitebuilder/images/960-001Silver-copy-341x341.jpg
I initially put them on as a joke, but even the judges at the shows were fooled.

haha nice.... do they actually look legit? got any pix of them on ur xB?

I initially put them on as a joke, but even the judges at the shows were fooled.

Who was judging the show, a bunch of 3rd graders?

(not flaming your car or you, just the judges for not recognizing the fact there's no caliper on that "brake disc")

haha nice.... do they actually look legit? got any pix of them on ur xB?

Here they are on my xB with 19's.

http://img.photobucket.com/albums/v221/dwestxb/DSCN1270-1.jpg

^^^thats rice! ;)

ok, so what exactly do i need to get from the junk yard? just rotors and the callipers, do i need any thing else? if anyone could answer it would be very helpful, im thinking of hopefully doing this next weekend if i can get ahold of the parts

Edit: missed the front brake to rear portion, i've got my answer.