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View Full Version : Thirdgen LS rear brake swap

WayFast84
05-01-2017, 07:01 AM
I'm putting LS brakes on a 12 bolt designed for a 4thgen into my 84. I planned on getting lines and cables from Flynbye and it seems like a few options might work.

Hard line:
http://flynbye.com/catalog/i215.html

Braided + Axle:
http://flynbye.com/catalog/i193.html

Braided:
http://flynbye.com/catalog/i105.html

Without emailing them and getting upsold which of the three would be what I need? Any other options for this swap besides flynbye?

These are the cables I'd get:
http://flynbye.com/catalog/i153.html
sweetbmxrider
05-01-2017, 09:19 AM
What is currently on the rear? Do you have rubber hoses? The hard line and braided hoses are obviously the complete setup, if that is what you need then grab it. You will have to manipulate the hard lines to match the 12 bolt routing and overall length. 4th gen rears wider or narrower? I guess that is the only problem you'd run into. Could make your own lines if you are up for it.
wretched73
05-01-2017, 09:59 AM
What is currently on the rear? Do you have rubber hoses? The hard line and braided hoses are obviously the complete setup, if that is what you need then grab it. You will have to manipulate the hard lines to match the 12 bolt routing and overall length. 4th gen rears wider or narrower? I guess that is the only problem you'd run into. Could make your own lines if you are up for it.

4th gen rear is a little wider (.5"-1" on each side IIRC)
sweetbmxrider
05-01-2017, 10:02 AM
Ah, then I would get 4th gen hard lines with 4th gen hoses. They should be the correct length and have the proper fittings on it. The hose between the rear feed line and rear end should be the same fitting size but might want to google a little first. I would suggest a 3 channel lt1 hose, just check the length is enough.
wretched73
05-01-2017, 11:16 AM
IIRC also, Flynbye takes a while to ship and doesn't answer e-mails.... but has a high quality product.

I bought a full brake line kit for my truck from sstube.com. Very happy with my experience. The tubing is just plain jane 304 stainless, welded, 1/4" OD x .028" wall
Paul Huryk
05-01-2017, 02:54 PM
A factory spec 4th gen rear is about 2.25" wider per side than a 3rd gen rear. Makes picking wheels very tricky.

4th gen rear is a little wider (.5"-1" on each side IIRC)
WayFast84
05-03-2017, 03:33 PM
Awesome. Got the cables and hard lines. I'm going to run fourthgen wheels btw.
wretched73
05-03-2017, 05:56 PM
What's the width and back spacing on 4th gen rims? Curious how far they will stick out
WayFast84
05-04-2017, 07:01 AM
Just going to run stock salad shooters. I believe there are pics somewhere online.
WayFast84
05-24-2017, 06:04 AM
IIRC also, Flynbye takes a while to ship and doesn't answer e-mails.... but has a high quality product.



Still hasn't even shipped yet...