ABS module?

Tiny
RHALL77
  • MEMBER
If you have it removed, I would suggest stoping at your local dealer and see if they can get you a copy of what you need.
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Monday, August 31st, 2020 AT 11:15 AM (Merged)
Tiny
LIONWOLF
  • MEMBER
  • 1999 CHEVROLET SILVERADO
  • 5.3L
  • 5 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
I watched your video on replacing 1999 Chevy Silverado 1500 LS 2wd 5.3L ABS Module and I was told I have to flush the brake fluid after I put in new ABS Module. Is this true and where do I bleed the fluid from?
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Monday, August 31st, 2020 AT 11:15 AM (Merged)
Tiny
AL514
  • EXPERT
Hello thanks for using 2CarPros, has the brake fluid ever been replaced since you've had the truck? It is a good idea, if the fluid is black in the master cylinder, then bleed the master itself so that none of that old fluid goes into the ABS module, then refill it with new fluid and bleed the whole system. Start with the wheel closest to the master cylinder (so the front drive side) then the passenger side front, then the drivers side rear, and last the passenger side rear, since it's the farthest from the master cylinder. This way all the air will be able to escape. There should also be 2 bleed screws on the abs module, bleed the one closest to the firewall first,then the other.

this guide should help

https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system

Please run down this guide and report back.
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Monday, August 31st, 2020 AT 11:15 AM (Merged)
Tiny
AL514
  • EXPERT
I'm sorry I had the process reversed. Start with the wheel farthest from the master cylinder which is the passenger side rear, then the driver's side rear, then passenger side front, then driver's side front. I'm sorry I had them backwards before, (this is edited) This way all the air will be able to escape. There should also be 2 bleed screws on the ABS module, bleed the one closest, to the firewall first, then the other.
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Monday, August 31st, 2020 AT 11:15 AM (Merged)
Tiny
LIONWOLF
  • MEMBER
Awesome thank you! I was just wondering how air gets into the line when replacing abs module because it s only held on by four screws. Or is it just a good idea to change brake fluid cause usually the fluids been in the lines awhile when you replace ABS module?
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Monday, August 31st, 2020 AT 11:15 AM (Merged)
Tiny
AL514
  • EXPERT
It's just a good idea to flush the brake fluid since you're already replacing the module. It's part of routine maintenance, but also to make sure all the air is out of the new module. Does the new module have bleeder screws on it? Some don't.
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Monday, August 31st, 2020 AT 11:15 AM (Merged)
Tiny
LIONWOLF
  • MEMBER
No bleeder screws on this one just 3 connectors and it s under the truck. I was just thinking why bleed the lines when no fluid goes into the ABS Module. It s literally a small flattish metal and plastic box with 3 connection spots and a circuit board inside.
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Monday, August 31st, 2020 AT 11:15 AM (Merged)
Tiny
AL514
  • EXPERT
Okay, I see. I thought you were replacing the whole hydraulic unit. Yes the modules just bolt right on top of the hydraulic unit. I think this the same module as you're doing in this video . I don't see why you would have to flush the fluid in this case. Unless it's black, that means the seals in the master cylinder are going bad.
https://youtu.be/lUotkKXG9dY
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Monday, August 31st, 2020 AT 11:15 AM (Merged)
Tiny
AL514
  • EXPERT
Just make sure the brake pedal is firm and not spongy. That would indicate air in the system. And may I ask who told you to flush the whole system?
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Monday, August 31st, 2020 AT 11:15 AM (Merged)
Tiny
LIONWOLF
  • MEMBER
Thank you for your help I really appreciate it. The person while told me to flush it was someone I know who works at a local commercial garage, but I m guessing he thought I was replacing the whole unit as well. Again thank you!
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Monday, August 31st, 2020 AT 11:15 AM (Merged)
Tiny
AL514
  • EXPERT
No problem, let us know if there's anything else we can help with.
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Monday, August 31st, 2020 AT 11:15 AM (Merged)
Tiny
OLDCHAS
  • MEMBER
  • CHEVROLET SILVERADO
MY truck is a 1999 2wd ext cab. 56000 mi. 6cyl.
The abs module has 5 ports for hydraulic lines. Three in a row near the top of one end of the unit and two spaced just below those. Two of these ports are for input lines and three are for output. I need to know which ports are input (one front input and one input for the rear) and which are output (one output rear, two output front.)


http://www.2carpros.com/forum/automotive_pictures/82139_KHABS_1.jpg

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Monday, August 31st, 2020 AT 11:16 AM (Merged)
Tiny
DODGERAM333
  • MEMBER
Looking at your pict. Tr goes to rear brakes. Ct goes to rf, tl goes to lf. Bl goes thru proportioning valve and to the front of the master cylinder. Ll goes thru prop. Valve and to the rear of master cylinder. 02 dodge ram 3500.
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Monday, August 31st, 2020 AT 11:16 AM (Merged)

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