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No brake fluid to both front calipers

chriscw81

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chriscw81 Enthusiast

chriscw81

Posted
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Hi folks! I've got a 2000 gmc Sierra that I just replaced all of my brake lines on. I'm not getting brake fluid to both of my front calipers while the rear calipers get it fine . I've verified that my lines are in the correct place. If I loosen the lines at the master cylinder and pump the brakes I see fluid coming out. Also, I see that fluid is getting to the abs module because the if I loosen the lines there and pump the brakes I see fluid. There is definitely no fluid coming out of the abs module to both front calipers. Is my abs module bad? I hope not. Any help is appreciated.

 

Chris

 

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KARNUT Senior Enthusiast

KARNUT

Posted
Posted

Just in case you don't know bleeding procedures. Close all bleeders push down pedal keep it down slowly open right back bleeder let fluid bleed out close let up brake pedal repeat till no air comes out. Work the next back the same way then go to passenger front so on making sure the fluid is kept full in the master cylinder. If you had brakes before you change the lines than you should have them after the change.

 

 

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chriscw81 Enthusiast

chriscw81

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Thanks for the reply, KARNUT. That is how I bleed my brakes. But I still am not getting anything to both from calipers. After I bleed both rear calipers the pedal pressure builds up so much that the pedal can barely be moved. With both front brake lines disconnected at the tires no fluid is making it

 

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KARNUT Senior Enthusiast

KARNUT

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Posted

I would loosen at the master cylinder and work from there. Could be a bad master cylinder.

 

 

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chriscw81 Enthusiast

chriscw81

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I would loosen at the master cylinder and work from there. Could be a bad master cylinder.

 

 

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I loosened at the master cylinder and got fluid coming out at both connections.

 

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Nanotech Environmental Enthusiast

Nanotech Environmental

Posted
Posted

Hi folks! I've got a 2000 gmc Sierra that I just replaced all of my brake lines on. I'm not getting brake fluid to both of my front calipers while the rear calipers get it fine . I've verified that my lines are in the correct place. If I loosen the lines at the master cylinder and pump the brakes I see fluid coming out. Also, I see that fluid is getting to the abs module because the if I loosen the lines there and pump the brakes I see fluid. There is definitely no fluid coming out of the abs module to both front calipers. Is my abs module bad? I hope not. Any help is appreciated.

 

Chris

 

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I think your question about the ABS module is where you need to start looking. Based on what you've described, there could very well be an issue there. At minimum, I'd suggest pulling it out and inspecting it.

chriscw81 Enthusiast

chriscw81

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I think your question about the ABS module is where you need to start looking. Based on what you've described, there could very well be an issue there. At minimum, I'd suggest pulling it out and inspecting it.

I think I'll try that when I get home today. Any insight on what I should look for other than clogs or obstructions?

 

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chriscw81 Enthusiast

chriscw81

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Don't you have to purge the ABS with a scan tool? Or is that just newer models?

 

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The research I found online was mixed opinions. Some said it was necessary and others said they've done it without the tool

 

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It's Tim Senior Enthusiast

It's Tim

Posted
Posted

1. Install Combo-Valve Depressing tool J39177.

2. Bleed all four wheels (pressure- or pedal-method) in sequence (RR, LR, RF, LF).

3. Remove the Combo clip, then use a GM Tech 1 Scan Tool to run 4 functional tests while applying the brake firmly.

4. Repeat steps 1 and 2.

----------------------------------------------------------------------------------------------

Hillbilly method:

Lock em up on a gravel road to cycle the ABS.

Nanotech Environmental Enthusiast

Nanotech Environmental

Posted
Posted

I think I'll try that when I get home today. Any insight on what I should look for other than clogs or obstructions?

 

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Clogs or obstructions would be the first thing. Next would be to see if there's something mechanically wrong or ???

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