ls2twntur1200hp

I'm swaping a fourth gen rear into a 91 camaro. Ive got everything hooked up exept for the brake cables. It has a rubber line for eash wheel, unlike my 91. Does anybody know how to hook this up? Or can i swap an abs system in from a newer car?

MrDude_1

are you using the 4thgen brakes??


what you need is to T both of the rear brakes together, and connect them to the one rear brake line you have.

ls2twntur1200hp

were would i get somthing to tee them with. Also do you know anthing about the abs swap.

MrDude_1

there is no "ABS swap"
there are literally only a handful of never factory ABS cars, converted to ABS in the world.
i know quite a bit about doing it in a 3rdgen, and it would be an understatement to say its over most peoples heads.



the way i usually T the lines together is by cutting the hard line on the axle, and using a METRIC flare tool, flaring them to a standard double flare.

then i use a double flare T.... available at most good automotive stores, every hydraulic shop, or even at well equipped hardware stores.... if you can, get one with a tab so you can easily mount it.

ls2twntur1200hp

Ok thanks. And just to be one of the few i'm going to do the swap. Will post a guide if it works.

MrDude_1

you didnt even know how to connect two brake lines.

you have no idea what you're getting yourself into.

lets just pretend you have all of the plumbing right.... how do you plan to get your wheel speed sensors? what ABS computer are you going to use? do you know the wiring for it? the wiring for the pump? have the correct signals to send to the brake computer? if its not close enough, do you have the ability to re-tune the ABS computer to match the new specs?

ls2twntur1200hp

Well i have about 30 f-bodys in my back yard so i have all my parts, and i have factory service manuals so it couldnt be to hard expecially when you have a mechanical enginerring degree. Oh and about the hoses i was asking if there was somthing to easily bolt in place for a tee- no cutting.

TexasLT1

let us know how that works out.

I took 2 years of mechanical engineering, I know what you learn. ME doesn't teach you a thing about what you would need to do this swap.


and are you talking about the brake cables or brake lines? my 92 had a single cable exiting the trans tunnel with an adapter on the end to hook up 2 cables from the factory. I reused this when I swapped to the 4th gen rear.

Zepher

iTrader: (1)

yep, I did the same thing.

to get your ABS to work, you will need to probably mod some hubs from an S10 with ABS to work on your front.
You will need the mastercylinder from a 4th gen, an ABS Line interface box (box where all 6 brake lines go), the ABS computer, an LS1 PCM (or LT1 PCM) for Trac control since you will need this if you run 4 channel ABS.
If you are going to run only 3 Channel ABS, then you need to get the ABS LIB with 5 line hookup, a ring gear Reluctor ring, drill a hole in the top of your diff cover for the sensor and then wire it all up.
should be a pretty simple swap since you took ME and have all those cars to use.

ls2twntur1200hp

The brake lines.

TexasLT1

4th gen rear would already have that.


ls2 - on all three of the F-Body rears I've worked on, a late 80's 9-bolt, my stock '92 10-bolt, and a '95 10-bolt, they have all had hard brake lines on the rear itself with a tee bolted to the center section housing just to the left of the torque arm that a single brake line connected to.

MrDude_1

non traction control 4thgens have one flex line between the rearaxle and the chassis, and use a T on the axle hardlines... the axle speed is measured at the diff.

traction control 4thgens use two lines, one going to each wheel, and have two reluctors, one at each wheel.
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also, while ME is a great BASE to BUILD your career FROM..... its not any kind of education that is really useful or even necessary to build a hotrod ABS system.
what you really need is some specific specialized knowledge, that you cant get from any service manual.... yes, you need thoes wiring diagrams, but thats like saying you need paper to write a book..... its a requirement, but its far from being everything you need.

MrDude_1

btw, your username intrigues me.... of the handful of ABS thirdgens i have seen, most of them are basiclly 4thgens.... retaining the entire 4thgen ABS system.
if you are running 4thgen electronics, its not that bad.

TexasLT1

ahhh ok, that makes sense then.

Zepher

iTrader: (1)

only if the car was a 3 channel ABS car. 4 channel/TCS ASR cars don't have the hole in the pumpkin or the ring gear reluctor.

Orr89RocZ

iTrader: (20)

i got 3 months before i graduate..i didnt learn much of anythin that will help u in building stuff and in automotive work.

and like mrdude says, the 4th gen rears with no traction control have brake lines just like our thirdgens. they T into ablock just left of the housing and can connect to the factory thirdgen hardline on the body.

ls2, i would seriously just get the brake lines off of a 3 channel NON traction control rear and put them on your rear end. thats what i did, mine was traction control/abs and i got 3channel lines put on it. swap was easy. dont bother with the ABS conversion

MrDude_1

but, the flat boss is there...
so if you have a diff with a reluctor wheel on it, it is possible to drill(mill) the sensor hole... and drill/tap the sensor retaining screw hole.
i would doublecheck the sensor depth/ wheel clearance of course.. but its totally doable with just a drill press.... i suppose a hand drill could do it too, but you have to make sure you hold it square.....

ls2twntur1200hp

Ok Thanks for the help guys. I should have everything i need but you said something about s10 spindals/hubs. I have access to the company's machine shop ans i was going to machine the hubs to accept 2000 camaro front brakes. Would that work for the wheel sensors? I have three traction control cars to work with including the one the rear came off of. It has an ls1 already so i could just wire the abs computer to the ecm from the ls1 correct? I know the rear lines from the 2000 would work but the front lines would work with just bending right. Again thanks for the help.

MrDude_1

the 4thgen has a hub and a slipon rotor. the reluctor ring is on the hub.

the 3rdgen has a one piece combined hub and rotor...

now, if you turned down a 3rdgen rotor into just the hub (see the brake board for more info) you COULD also machine the backside of it to fit a reluctor wheel that is identical to the 4thgen one.... i honestly dont know if putting the 4thgen one on there is possible, but it may be.

then you could slip on the 4thgen 97+ brakes (or whatever you wanted) and just make a bracket to hold the wheel speed sensor over the reluctor wheel.

if you do it all right, you'll have the same brakes, and have the reluctor wheel.

ls2twntur1200hp

Thanks

ls2twntur1200hp

I'll check and see but do you thing a ls1 hub will fit a third gen spindal

MrDude_1

no way in hell... totally diffrent.

techniclly the 4thgen one is a "sealed hub" and is ment to be unbolted (you'll see what i mean when you look at the parts)

but even once you get it apart, the bearing surfaces and size are totally diffrent.



now, if the ABS equipped S10 rotors happen to have the same number of reluctor wheel teeth as the donor fbody front hubs... then you can just turn a S10 rotor down into a hub for the fbody brakes...

ls2twntur1200hp

Gotcha, took a look, i forgot about that. i found a place that makes hubs for the ls1 brakes( in the brake forum) I can get hubs and brakets from them but the ring is still my biggie! So basicly i need to find a s10 and get the rotors. But if they dont have the same number of teeth i can take the ring out right?
I asked the guy that makes the hub if he could machine out the back for a ring but he hasent got back to me yet. Also i removed all the lines and abs equipment from the camaro to start mocking it up, i pulled another set of brake lines from a third gen so that i can get it pretty close before i try it on the car. Thanks for the help.

MrDude_1

take the reluctor rings from the 4thgen (or the whole hub) and your new hubs to a decent machine shop... they should be able to turn the 3rdgen hub on a lathe, and press the 4thgen rings on.