How can I make sure my truck has 4 wheel ABS versus just 2 wheel ABS? What should I look for on the rear brake to know for sure?

 

See if you have an electrical connector going to the front hubs. Or you could look at the rear of the front fender liners, on the back side the connector that would hook to the front sensors will be there. Can I ask why? Are you buying hubs by chance? Get the ones with the sensor so that you can grease the hubs.

 

Alan is correct.
As an FYI...2 wheel ABS is rear wheel only and 4 wheel adds the fronts. So by default the rear wheels have ABS already. The sensor is in the differential housing.

 

thanks! I'm pricing/ordering some Power Slot rotors and want to make sure I get the right ones.

 

ABS has nothing to do with the rotors. The ABS tone ring is in the hub.

I notice you have a 99. What you have to watch out for is if you have E99 rotors, a build date prior to Mar 23, 1999.
Build date Mar 23, 1999 and later will have Late 99 rotors. Late 99 and Early 99 rotors are not interchangeable.

 

I do have an early 99. Just ordered the Power slot (cryo) and Hawks from RiffRaff and he had a convenient check box to select 'early 99' so I'm sure he will send me the right ones.

 

Clay has an E99 himself so he knows how to take care of E99 owners.

The most common date posted for E99s is a build date up to 12-98, but when it comes to front suspension and front brakes the date goes out to March 99.

 

Robin, are the rotor differences obvious? My build date is May 99 and I have the late '99 engine stuff but the early '99 suspension. If I bring my rotors with me tomorrow will you be able to look at them and tell me if they are early or late? I am mostly curious because I suspect that I have a weird hybrid front axle where I have a mix of early and late components. I know my springs are a little funky already because the left side is completely different than the right.

 

I wouldn't be able to tell just by looking at them. The E99 rotors are shallower. Laid down side-by-side the E99 rotor will be slightly shorter then the 99+ rotor. Not the diameter, but the width of the rotor. When you buy rotors that is the comparison to make. At the dealership I asked for rotors that were pre Mar 99 and compared them to one of my old rotors. If I had kept my old rotors I would have a measurement for you.

There is no difference between E99 and 99+ rear rotors.

Edit: When I checked at Napa they asked me if truck was pre Mar 22, 1999. The rotor they brought out matched my old rotor. Take one of your old rotors to a dealership and compare them to late and early rotors.

 

Old thread, but I dont think the answer to the original post was quite answered. I have a 2000 F350 with with connectors behind the front fender liners, but not the 4 wheel ABS valves. The wiring is dead. So I just have RABS. I bought ABS front hubs so I could grease them though. Anyone else have this situation of the wiring for front ABS in place, but no valving for the fronts? I think you can check under the air box/ battery box on the driver side for the ABS valves and lines.

 

My 2000 is the same, no front ABS valving, with front ABS unit bearings(sensors not in place) for greasing as well. I'm not sure I fully understand what you are asking though...

Mine initially just had the connectors to the front but no ABS unit bearings and no sensors or wiring to them. I used the block off plates on my old non ABS unit bearings(without sensors) to block off the sensor hole, this was before Clay's block off ABS fitting with zerk on them. Riffraff Diesel: Front ABS Grease-able Block Off Fitting

 

No real question, just noting the front fender wiring does not indicate front ABS will work. I'm kind of suprised Ford ran the wiring and not the front ABS, but maybe its cheaper in mass production to use common harnesses and just install the ABS valving/solenoids on trucks with that option ordered.

I have the sensors in place on the hubs, but the other end zip tied out of the way. I did not think to just run them where they would normally go and plug them into the dead connectors on the back of the fenders. At least until removing them to add the Riffraff blockoff fittings.