Hi all,

The 4TH gen rear is in however there a few problems. First the brake lines are an isue because the donor car has TCS. How did you guys tackle the break line issue? T fitting or lines from a car w/o TCS?

Also the pan hard rod is a few inches short. Anyone else encouter this? What was your solution?

Thanks,
BILL

i hate to say it but i have no idea what TCS is? for the pan hard rod my guess is you need to move there rear sideways. it can't be short, one end is attached to the frame and one end to the rear. move it till the bolt hole lines up, at least that's how it works on 3rd gen rears, and i've alwasy heard 4th gen rears are dirrect bolt in.

Thanks ede,

I used the abbreviation TCS for traction control system.

BILL

The TCS on the 4th gen rears is on top of the center section. Since you have nothing to plug into it, just leave it alone. I dont know what your issue is with the brake lines. Mine bolted in perfect and I went from drum to disc. The panhard bar is not short as ede said. shift the rear over to get it to align with the mounting bracket. Give us more info on your brake line problem

Thank you. The 4th gen rear has two rubber brake lines coming out of it for the body connection. The lines stay seperate and never combine.

The old rear only has one rubber line out to the body. The brake lines combine with a T fitting.

Come to think of it do I need to change the proportoning valve because of rear disc? What would happen if I don't?

BILL

if I rememeber correctly. my 4th gen rear has a rubber line oneach side that goes from the caliper to a mounting bracket on the axle tube. The lines are about a foot long. I have steel lines on each side that connect to them and come toghter to a t fitting in the middle of the rear. I just connected my old brake line from the car to the t fitting on the 4th gen rear.

That is where I am getting hosed up (pardon the pun.) The cars that have the traction control system did not have a t-fitting in the middle of the rear axl like yours did. It looks like I will have to get the lines off a reat that did not have the TCS.

Did you have any problems lining everything up during your install?

Try going to the dealer and see if they sell the steel line that runs along the rear with the t- fitting. had no problems with the rear lining up it went in like it belongs in there. you will have an E brake issue to deal with too

I knew that was going to be an issue. Please provide more details on the e-brake problem and how you resolved it.

I had to buy a pair of 1992 camaro e brake cables from the dealer. They have to be the 1st design. These will be the proper length and fit perfect.

Any problems with brackets? Did you order the cable for a 4 wheel disc?

Do you still have the part number?

BILL

I dont have the part number. I di order them for isc brakes though. It will show on the computer 1st and 2nd design. just get the 1st design.

Thank you for your help.

BILL

About your earlier question about the proportioning valve.
The valves on disc/drum and 4 wheel disc are different; the d/d has a "hold-off" valve inside of it. When you use this proportioning valve with a 4w disc rear, the rear brakes apply sooner and harder than the front, generally causing the rear wheels to lock up. That can be very un-good in some situations. Your best bet is to try to get a proportioning valve off of a 4 wheel disc 3rd gen. On the other hand, there is an alternative if you can't find one. You can remove the hold-off valve from the proportioning valve and replace it with a pipe plug. As half-@ss as that might sound to some, it actually works.

Thank you

Is that the thing with the rubber boot on top if it? Otherwise, how do I remove this part?

BILL

Bill
I think you have an ABS (4TH Gen) that is why the line did not combine

I had the exact same issues with my rear end as it was a TCS equipped one as well. However, I did not have to buy different Ebrake cables and only had to pick up a length of hard line for the driver side of the axle to get it to work in my 87 GTA. I reused the passenger side hard line and the existing 3rd gen rubber line going to the frame as well as the 4th gen (LT1 brakes) cables that came on the axle assembly.

Use the T-fitting that is part of the rubber line off the thirdgen and pick up a length of hardened line with the proper tubing nuts (can't remember what sizes they are off hand, but you can bring in the one you are taking off the 4th gen rear on the driver side and the rubber hose that goes to the frame of the 3rd gen to get the proper ones). Take the two rubber hoses that would go to the frame of the 4th gen and the bracket holding them off the axle. Bend the existing passenger one until it lines up with the rubber hose from the frame and do the same with the new line you get from the parts store. Use the bolt off the 3rd gen to mount the T-fitting part of the rubber hose to the axle housing (it has a hole in it and the housing is already tapped with the proper threads for that bolt).

That is it, just tighten up all of the fittings, bleed the lines, and adjust the bracket above the driveshaft until the cables are loose enough so the rear brakes don't drag.

Do a search on this subject as I, as well as a few others that have done the swap, have explained all of this stuff quite a few times .

Matt

I'm with AYMAN...the 2 rubber lines are for the ABS system to release and compress each caliper as required.


Ed

The dual channels in the rear is for the ASR system (my bad for calling it TCS, but they are pretty much one and the same really). ASR = Acceleration Slip Regulation or traction control in laymen's terms. The dual channels is for controlling wheel spin individually from one side to the other. The ASR system will use the brakes, transmission shifting, timing retard, etc. to slow down/stop wheel spin and it can discriminate from side to side with a dual channel system.