I'm curious to know of the 4 wheel ABS system can be retrofitted onto a truck with a 2 Wheel ABS system.

Anyone know if it's possible?

Well I would assume so since the abs computer is it's own thing, that acts on it's own.  

 

 

I am not sure if you would need a pcm from a 4 wheel abs truck though.  

Well I would assume so since the abs computer is it's own thing, that acts on it's own.

I am not sure if you would need a pcm from a 4 wheel abs truck though.

That is some things I would like to find out. I do know the ABS module is different and has a few additional sensors/plumbing other than that I'm not sure what else would be needed. My understanding is the 2 wheel drive hubs can have tone rings also but are not used unless you have 4 wheel ABS.

I would assuming the only thing that the pcm talks to the abs about is the rear sensor on the pumpkin.  

 

Then I would assume the abs takes and compares the rear value to the front abs value?

 

 

Do the front abs sensors connect to the pcm or the abs computer directly?

I would assuming the only thing that the pcm talks to the abs about is the rear sensor on the pumpkin.

Then I would assume the abs takes and compares the rear value to the front abs value?

Do the front abs sensors connect to the pcm or the abs computer directly?

They go to the ABS module as far as I know and use the data link to communicate with the PCM to also calculate wheel speed.

I'm pretty sure its a stand alone unit for ABS computer just need to be plugged into the CCD network. Which leads me to the fact you most likely don't have the plugins for it.

 

 

They go to the ABS module as far as I know and use the data link to communicate with the PCM to also calculate wheel speed.

 

Yes that is correct the speed data is sent back over the CCD network for the instrument cluster and the PCM for transmission and cruise control functions.

I'm pretty sure its a stand alone unit for ABS computer just need to be plugged into the CCD network. Which leads me to the fact you most likely don't have the plugins for it.

Yes that is correct the speed data is sent back over the CCD network for the instrument cluster and the PCM for transmission and cruise control functions.

That is correct I have a two wheel ABS system. I was trying to see if it was possible to convert it into four wheel ABS. Locking up the front discs on this new quiet pavement is no fun. On older pavement that is a little more course it's not a problem.

So you can see why I'm curious to see if it's possible. If so I may start slowly collecting all the pieces to make it happen.

There is an unused connector laying by the drivers side firewall that enters the harness I'm betting it's for a four wheel ABS system.

Edited September 15, 20159 yr by Vais01

I would find a truck in a junk yard and compare the harness.  Gasser or diesel shouldn't matter. 

 

I would guess the output from the ABS computer is the same for a 2 wheel abs vs 4 wheel.    

 

I would also guess the PCM isn't smart enough to know any better.  

 

New water though.