3 channel abs?

[jseal-57]

Am I correct that this is a 3 channel abs?
ImageUploadedByTapatalk1363986430.465292.jpgImageUploadedByTapatalk1363986454.702669.jpg

[Spartan7]

That looks like 4 channel. Trace the middle brake line, which is for the rears. If it's going down into another block, which would sit below the ABS block, and it has 2 more brake lines coming out of it, that's 4 channel.

[jseal-57]

Ok thanks for the help.

[firebird_1995]

Looks just like my 3 channel. I though 4 channel abs units had 4 lines coming off the side. I guess the 4th line would be where that undrilled boss is in between the second and third line

Also, 4 channel was only used on cars with traction control

[Spartan7]

No, 4 channel is plumbed as I described. You can tell a 4 channel because the rear wheel line goes towards the front of the car, rather than back like the two front wheel lines. There is a seperate block mounted under the ABS block that modulates pressure to either wheel.

I could be wrong, maybe GM plumbed some of the lines like that on non-TCS cars. But you can tell for sure if you find that extra block. Or just check your RPO codes, NW9 is traction control (4 channel).

[jseal-57]

Well I checked the car out today again and it looks like a 4 channel so thanks for the help