ABS brake line routing - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-16-2012, 07:23 PM   #1
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Default ABS brake line routing

So, as an unintended diversion from my tranny problems, I tried to move the car and the brake lines blew out... turns out all 6 lines passing between the frame and tranny are rotted to hell.

During the process, I have forgotten which ABS port goes to which rear brake. Luckily, I have everything else straight. Does anyone have a ABS diagram or a port-out of the ABS?

Thanks in advance.

BKNJ
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Old 07-16-2012, 09:15 PM   #2
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This diagram is for my 97 B-ville from Alldatadiy.com it should still apply to yours.
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Old 07-16-2012, 09:35 PM   #3
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Are you sure that'* the right picture? Its my understanding that '96-'99 Bvilles all use the same ABS unit... but the one in your picture shows all the out ports in a line... on the ABS units I see for '96-'99s, there are two ports on one side and two ports on the other side of a cylindrical protrusion.

(Warning bad ACSII art)

This is the front view of the unit (standing in front of car)
(to rear of MC) (to front of MC)
I I
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
x x
x A B x
x xxxxxxxx x
x xxx xxx x
x C x x D x
x x x x
x x x x
x xxx xxx x
x xxxxxxxx x
x x
x x
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

A and B are the rear lines but I'm unsure which is which.
C is the Driver'* side Front. (LF from driver'* seat)
D is the Pass side Front. (RF from driver'* seat)
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Old 07-16-2012, 09:44 PM   #4
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I see this forum software is hostile to ASCII art. LOL.

I attached a quick picture of the front view of the ABS unit. I need to figure out the top two ports.

Thanks in advance.
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Old 07-16-2012, 10:40 PM   #5
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Now that I think about it, it does seem different. When it gets daylight tomorrow, I will go out and verify.
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Old 07-19-2012, 07:03 PM   #6
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Nobody knows which port goes where?
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Old 07-19-2012, 07:17 PM   #7
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Grrr. Thank you for reminding me. 99% of the time I'm on here everyday. Sometimes I tend to "forget". Please feel free to remind me via a PM if I have said I would do something.

You are absolutley correct. That is the wrong image. I noticed on mine, its stamped in the ABS housing which ones are which, but due to the bracket, I cannot determine what the top 2 lines are for. If I remember, the 2 feed lines fromt the master cylinder are different sizes?
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Old 07-19-2012, 07:26 PM   #8
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Quote:
Originally Posted by Mike1995 View Post
Grrr. Thank you for reminding me. 99% of the time I'm on here everyday. Sometimes I tend to "forget". Please feel free to remind me via a PM if I have said I would do something.
That wasn't meant to be a dig at you. I'm just surprised no one else posted. I imagine someplace is a port-out diagram.

Quote:
You are absolutley correct. That is the wrong image. I noticed on mine, its stamped in the ABS housing which ones are which, but due to the bracket, I cannot determine what the top 2 lines are for. If I remember, the 2 feed lines fromt the master cylinder are different sizes?
From the MC, I do believe they are different sizes. Different sizes for the front and rear outputs, as well.

If its stamped into the ABS unit, then mine has too much corrosion to read it. The lines coming from the top aren't my problem... I know which ports they go to on the MC. My problem is the top two of the four on the front. If they are labelled, I didn't see anything. Even looking at the units for sale on eBay, I didn't see any labels.
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Old 07-19-2012, 07:52 PM   #9
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Not labled with like a sticker, but actually stamped into the casing. Not on the front, but on the side directly behind the lines.
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Old 07-22-2012, 12:57 AM   #10
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Quote:
Originally Posted by Mike1995 View Post
Not labled with like a sticker, but actually stamped into the casing. Not on the front, but on the side directly behind the lines.
I finally got a chance to double check this... with the ABS unit up against part of the frame, I can't check the one side, but on the clear side, I see no markings on the front or side near any of the bosses the lines are tapped into. There are markings on the top... for MC1 and MC2... but I know where these go.
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