Brake Line Diagram

99_4.8_LR4 · September 28, 2009

Hi guys , I am looking for a diagram for a 99 GMC Sierra (new body style for that year) for brake line routing .

Just need it for the front 1/4" lines , from the ABS unit forward.

I made a template when I took the old lines out but I want to double check .

Thanks in advance .

grose67 · September 29, 2009

Good luck on this one. I checked the factory service manual and it shows nothing.

99_4.8_LR4 · October 2, 2009

Good luck on this one. I checked the factory service manual and it shows nothing.

Hm , thanks anyway .

Looks like my diagram was wrong after all .

I went to bleed the system today and could not get fluid out of the drivers front brake line .

Ok so here is the part where I ask one of you guys to look under your 99-00 NBS truck and trace the 5 lines from the ABS forward . If you do this you will be my hero . It wont be easy and could possibly take 2 guys , but still it would rule .

OR if anyone could just post a pic with the ABS pump / dist block and the locations that would work also . If I am correct that what I have done is swapped the first O with the last O .

I think that the top 3 lines are fluid outs and that the bottom 2 are for the master cylinder . The third O is for the rear brakes , this is for sure , and the second O is for the pass front . The arrangement is like this looking at the dist block on the front of the ABS .

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bossier62guy · October 3, 2009

Good luck on this one. I checked the factory service manual and it shows nothing.

Hm , thanks anyway .

Looks like my diagram was wrong after all .

I went to bleed the system today and could not get fluid out of the drivers front brake line .

Ok so here is the part where I ask one of you guys to look under your 99-00 NBS truck and trace the 5 lines from the ABS forward . If you do this you will be my hero . It wont be easy and could possibly take 2 guys , but still it would rule .

OR if anyone could just post a pic with the ABS pump / dist block and the locations that would work also . If I am correct that what I have done is swapped the first O with the last O .

I think that the top 3 lines are fluid outs and that the bottom 2 are for the master cylinder . The third O is for the rear brakes , this is for sure , and the second O is for the pass front . The arrangement is like this looking at the dist block on the front of the ABS .

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If the 02 is the same I'll do the dirty work for you tomorrow, weather permitting of course...