Brake line diagram - SOLVED (2024)

PNW VietVet said:

Looks like this: https://www.rockauto.com/en/moreinfo.php?pk=1416050&cc=1424191&pt=679&jsn=939&jsn=939 ABS Modulator Valve

The other choice does not look the same and if is the other choice you would have a JL4 RPO code. That would mean you have active brake control and would likely have the master cylinder with a spout out the front of it. Mine has all that with the hydro-boost system.

Is your rig a 1/2 ton or 3/4 ton?

Click to expand...

1/2 ton ... that looks like the part but I just need the line that runs to it from the dist block. I got a kit that I'm going to check to see if it contains the right hose.

Read thru this link: https://www.gmpartsgiant.com/parts-...burban-1500_4wd/brakes/brake_lines_front.html, and see if pipe #15181253 looks like maybe it but I could be way off base.

That part #15181253 crosses to this at RA: https://www.rockauto.com/en/moreinfo.php?pk=2577778&jsn=723

I was able to find the hose in a kit. I'll take out the other two short hoses from the master to the dist block. Got the hose replaced but the braking system will not engage now. Lights on brake and Trac control as we as service brake system light. Too much air in the system? I filled the line before securing the connections. Aside from cracking a connection how do I bleed this?

Nothing shows up in a basic OBDII scan. Should I try a hard reset by disconnecting the battery?

PNW VietVet said:

Read thru this link: https://www.gmpartsgiant.com/parts-...burban-1500_4wd/brakes/brake_lines_front.html, and see if pipe #15181253 looks like maybe it but I could be way off base.

That part #15181253 crosses to this at RA: https://www.rockauto.com/en/moreinfo.php?pk=2577778&jsn=723

Click to expand...

The RA one is the one I found earlier but it is not the right shape. This one does a complete 180 out the back of the dist block.

• 
  
  
  
  15181253
  PIPE, FRONT BRAKE COMBINATION VALVE
  • Fitting Vehicle Options:
    CK1(06-36)(JH2)
  $65.44$34.68
  Add To Cart
• 
  
  
  
  15181253
  PIPE, FRONT BRAKE COMBINATION VALVE(INCLUDES 3)
  • Fitting Vehicle Options:
    CK1(06-36)(JH2)
  $65.44$34.68
  Add To Cart
• 
  
  15181254
  PIPE, REAR BRAKE COMBINATION VALVE
  • Fitting Vehicle Options:
    CK1(06-36)(JH2)
  $65.44$34.68
  Add To Cart
• 
  
  15181254
  PIPE, REAR BRAKE COMBINATION VALVE(INCLUDES 3)
  • Fitting Vehicle Options:
    CK1(06-36)(JH2)
  $65.44$34.68
  Add To Cart
• 
  
• 
  
• 
  
• 
  
• *******************************That looks like these on the other link I sent you from GM Parts Giant****************************

shegarty said:

I was able to find the hose in a kit. I'll take out the other two short hoses from the master to the dist block. Got the hose replaced but the braking system will not engage now. Lights on brake and Trac control as we as service brake system light. Too much air in the system? I filled the line before securing the connections. Aside from cracking a connection how do I bleed this?

Nothing shows up in a basic OBDII scan. Should I try a hard reset by disconnecting the battery?

Click to expand...

This will require a high end scan tool, you will have to activate the ABS pump, and continue bleeding. Its a long process. The entire system, all calipers, and ABS pump, and everything need to be bled.

TollKeeper said:

This will require a high end scan tool, you will have to activate the ABS pump, and continue bleeding. Its a long process. The entire system, all calipers, and ABS pump, and everything need to be bled.

Click to expand...

This is what I was afraid of. So it's likely a trip to a shop that can bleed the system for me then.

PNW VietVet said:

• View attachment 352915
  View attachment 352916
  View attachment 352917
  View attachment 352918
  15181253
  PIPE, FRONT BRAKE COMBINATION VALVE
  • Fitting Vehicle Options:
    CK1(06-36)(JH2)
  $65.44$34.68
  Add To Cart
• View attachment 352919
  View attachment 352920
  View attachment 352921
  View attachment 352922
  15181253
  PIPE, FRONT BRAKE COMBINATION VALVE(INCLUDES 3)
  • Fitting Vehicle Options:
    CK1(06-36)(JH2)
  $65.44$34.68
  Add To Cart
• View attachment 352923
  View attachment 352924
  15181254
  PIPE, REAR BRAKE COMBINATION VALVE
  • Fitting Vehicle Options:
    CK1(06-36)(JH2)
  $65.44$34.68
  Add To Cart
• View attachment 352925
  View attachment 352926
  15181254
  PIPE, REAR BRAKE COMBINATION VALVE(INCLUDES 3)
  • Fitting Vehicle Options:
    CK1(06-36)(JH2)
  $65.44$34.68
  Add To Cart
• 
  
• 
  
• 
  
• 
  
• *******************************That looks like these on the other link I sent you from GM Parts Giant****************************

Click to expand...

I think all of these are for the master to dist block. Here's the offender here

Well, I hope @915_Tahoe chimes in then.