Since I bought this truck about 8 months ago I have had the three amigos plus the brake light was on. Upon reading nearly everything on the subject I replaced the shuttle valve, but not the falcon gaskets as there was no obvious leakage.

I replaced much of the brake fluid as well.

Long story short, all four lights remained. A generous board member here sent me his ABS amigo. I pulled codes and found the attached.
--------------------------------------------------------------
1.--Current Faults---->
Active Faults:
None
Logged Faults:
015:Pump fail pump running when not On
022:ECU Gnd or Reference Gnd bad
045:Rear Left sensor output low
Rear Left Sensor Bad Output
114:Shuttle Valve Electric Failure
<-END Faults
------------------------------------------------------------
* *
------------------------------------------------------------
..--Previous Faults--->
Active Faults:
None
Logged Faults:
040:Pump relay open circuit
045:Rear Left sensor output low
Rear Left Sensor Bad Output

My point is that the codes indicate speed sensors among other faults. And I did not, knock on wood, replace or repair them.

So, a couple days later, no codes. Hopefully, that continues.

 

In follow up, of course in the snow and few cycle of ABS the lights are back, Ill have pull the codes again and see what has changed.

 

It needs a left rear hub.

 

It needs the entire hub? Let me pull new codes and I would appreciate your input on that.

 

It's got an active fault for the shuttle valve switch.

Just replacing the switches won't fix it sometimes. You'll have to do the bypass.

 

Update: Drove it for a while in the snow, got the traction control to engage. The TC light went on momentarily. Otherwise, amigo free.

The stored codes are:
-Current Faults---->
Active Faults:
None
Logged Faults:
114:Shuttle Valve Electric Failure
<-END Faults
------------------------------------------------------------
* *
------------------------------------------------------------
..--Previous Faults--->
Active Faults:
None
Logged Faults:
015:Pump fail pump running when not On
022:ECU Gnd or Reference Gnd bad
045:Rear Left sensor output low
Rear Left Sensor Bad Output
114:Shuttle Valve Electric Failure
<-END Faults

If I understand correctly, I need to do the bypass, is that accurate?

Thanks,

 

Yes. The Option B bypass is not difficult, just tedious. Looks like you may still need a LR sensor too. Or perhaps double check its connector first. Unless you did something to address that code it may come back.

 

what abs codes did you start with?