I'm finishing up drum to LS1 disc brake swap on my '89. I am using the 3rd gen axle, just modifying it for the backing plates, PBR's, etc. I have to replace the drum brake lines anyway (just didn't want to let go,) and I've read where they need to be modified to connect to the brake hoses on the PBR caliper. I've tried flynbye, but have received zero response. I looked into Inline Tube to simply get the replacement lines that I need, and came across this.


I reached out to the company, and it turns out these are for their own disc brake conversion kit that they make for 3rd gens. Rep said it uses 10mmx1.0 fittings at the caliper ends, and 3/8-24 at the axle tee. My main question is, are the fittings the correct size to connect to the brake hoses on the calipers? If they are these seem like they would be plug and play for those of us installing LS1 rear brakes on the 3rd gen rear. Here's a link to their in-house rear brake conversion using these lines. Thanks

 

You can just make lines yourself. Doesnt take much time to bend and flare.

 

I appreciate that, but I don't own a flare tool or a bender. If I don't need to buy tools that won't get used but a handful of times, enough line and fittings to practice on, and can go back to a reputable company in the chance that parts fail, I'd rather spend $50-60 on some plug and play parts. Plus, I would like this to be informational for other people that are in the same position I'm in.

 

I'd almost bet you could use the LS lines and hoses from a 3 channel abs setup . You could bend the tubing a bit to takeup the length. Carefully bend by hand around a round thing

 

This is exactly what I did. The fit was great.

 

Whether you're doing an LS1 rear disc swap on a 3rdgen axle, or a 3rdgen rear disc swap on a 3rdgen axle, you don't need (or want) LS1 hard lines, nor those conversion hard lines. People who already have 3rdgen rear discs but swap to LT1 or LS1 rear discs usually don't even change their hard lines. Obviously, you need hard lines since you're swapping drum to disc, but all you need are these for 3rdgen:
1989-92 Chevrolet Camaro Rear Disc Axle Lines Metric Fittings 2pc, Sta – Inline Tube

Then you should be able to get hoses over the counter, or get them from Scott at Big Brake Upgrade, who will answer any questions you have. Looks like he also provides the appropriate 3rdgen bubble flare tee (LS1 hard lines need a 3/8-24 inverted flare tee):
Stainless steel brake hoses -Rear

 

Sorry for being late, but figured I'd chime in. I did the LS1 rear disc swap on my thirdgen drum rear last summer, following the guide that you can find on TGO here. Shame the pictures seem to be gone now, I may have some screenshots of the page from when the pics were still up... Anyways, what I ended up doing was: I cut the driver's side drum line a bit shorter, so it lined up with the LS1 rear hose brackets (the ones that are held in by the LCA bolts), then reflared it with a cheap tool I got from Rockauto for like $10. Not sure if your '89 would have already had the Metric lines from factory, but in my case, the fitting was already the proper M10-1 that 4thgen/ late thirdgen disc hoses use. My cheap flare tool didn't treat the pass side line very well, so I ended up just using a preflared bit of ni-cop line from the local O'Reileys and matching it up to the factory hardline. Ni-Cop is super easy to work with, I don't own a tube bender and had no issues with getting it situated.

Wanted to mention a couple more things in case you ran into the same problems that I did. I ended up using factory '92 disc hoses, but they do have a bit of a bend to em with the LS1 hose brackets. Doesn't seem to be causing any issues, but figured I'd mentioned it. Additionally, I'd like to correct the bit of that guide. It says that you can use the 4thgen e-brake cables, but this is NOT TRUE. The end of the e-brake cable that attaches to the T piece hooked up to your e-brake handle is different between 3rd and 4thgens. I was able to use the longer version of the '92 disc brake cables to get mine working right, hooked into the same 4thgen bracket that the hoses bolt up to. I used a pair of the DORMAN C94597 cables, the 1460mm ones you can find on Rockauto for $16 each, give or take. I don't reckon the shorter ones would fit properly, it was pretty tight even getting these ones on, but they fit and function well. Good luck with the rest of the conversion if you haven't already finished it, you're gonna love the new brakes!

 

82-83 have SAE lines with sizes like ¼" line w 3/8"-24 threads and 45° "inverted" flares. 85-up have metric everything and "bubble" flares. 84 started out SAE butt changed over to metric as the year went on, so could be either, just gotta look.

So those Inline lines are for 82-83. Perfect for those, WRONG for 89. They will NOT work on 85-up because those need to be 6mm line and 10mm (or whatever it is) nuts at the tee on the pumpkin, and the flare style is different. I can't imagine that they don't make the correct style for the later models: call em and ask.

 

@LLCooLM495 Thanks for coming back to this. I actually just finished the swap after multiple hits and misses with brake lines. If my passenger side brake line hadn't completely welded itself into the axle tee, I would have just modified the factory lines. The lines I first posted were returned, and I got the stainless lines from Inline Tube for factory drums, and figured I would go ahead and modify them. Was able to bend the longer passenger side to make it line up with the 4th gen hoses on the calipers. But shortening and re-flaring the driver side proved difficult. I wrecked a Harbor Freight flare tool (returned) and couldn't bring myself to buy the high dollar flare tool for one brake line. I ordered the lines that @LAFireboyd posted above, but those still didn't fit without re-bending, especially the driver side, since they're made for rear mounted calipers. So I ended up with a stainless passenger side and an OE-steel driver from the disc brake kit from FireBoyd, since I knew it was be easier to deal with than stainless. Knowing what I know now, I should have just got some Ni-cop and did them all myself. But I have a spare for each side if I ever need it. I believe I ordered the 1460mm e-brake cables so fingers crossed, that's not an issue. Hoping to get the upgraded rear end slid back in this weekend!

 

Right on! Sorry you had to go through a couple different lines, but glad you got a setup workin! I was able to double check after I got home from work, turns out I actually used the AC Delco 18P1104 cables, the 1444mm ones... 1460 would def still work, might just need to route it differently. Looks like you arent usin the 4thgen hose/ cable brackets, so you woulda needed slightly different routing anyways. I've found some images from the install, here's some that show those 4thgen brackets I mentioned. Gotta drill a hole in the LCA shell to make room for a lil tab on those hose/ cable brackets, but they made the mounting go just like factory. Not completely necessary, but figured I'd show how they fit up on a thirdgen axle now that the images are gone from that original swap guide. Hope the final install goes well for you!


Here's what the pass side bracket looks like off the car. Slight edit, as you'll see in the 4th pic, I did have to cut the far side of the bracket off to fit the LCARBs. The locator tab keeps it in place, haven't had an issue after a year of daily driving.



Driver's side with the 4thgen bracket

Pass side, the e-brake clips into that tab right under the axle flange

Pass side, with one of the e-brake cable eyelets from a 4thgen

Cable installed in the 4thgen bracket