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Wildman318

By Wildman318
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Wildman318 Enthusiast

Wildman318

Posted
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Our company owns several 1 ton 3500 General Motors dump trucks with ABS on them. All the brake lines were rotted and were fully replaced. I tried the old style conventional brake bleeding on it and got no from brake pedal. What are we doing wrong??? Signed: the wildman 318

Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted

Probably some air in the ABS unit - happens occasionally. Might have to find a dirt, or sandy road, and do a couple ABS stops in it, then try again.

 

Of course if you've got a bi-directional scan tool, you can activate the ABS while bleeding.

Colossus Senior Enthusiast

Colossus

Posted
Posted

In some cases (not sure with GM) you have to use a Tech-II to activate the ABS unit to purge things. 

sdeeter19555 Senior Enthusiast

sdeeter19555

Posted
Posted
In some cases (not sure with GM) you have to use a Tech-II to activate the ABS unit to purge things. 
This is how I understand my 2012 needs the brakes bled...I need the brake system flushed, and will be taking it to the garage next week so they can cycle the ABS.

Sent from my SAMSUNG-SM-G900A using Tapatalk

Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted
4 hours ago, Colossus said:

In some cases (not sure with GM) you have to use a Tech-II to activate the ABS unit to purge things. 

Any bi-directional scan tool can do this - doesn't have to be a Tech 2.

  • 2 weeks later...
Wildman318 Enthusiast

Wildman318

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On October 12, 2017 at 1:56 PM, Jsdirt said:

Probably some air in the ABS unit - happens occasionally. Might have to find a dirt, or sandy road, and do a couple ABS stops in it, then try again.

 

Of course if you've got a bi-directional scan tool, you can activate the ABS while bleeding.

 

Wildman318 Enthusiast

Wildman318

Posted
  • Author
Posted

This may be true, but I cannot use my Tech 2 scanner to "auto bleed" for the ABS system because I cannot erase a code c0550... I need to erase this vide first. Wildman318

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