For about a week, the ABS / Brake light would stay on for about 10 miles and then go off. Now it stays on permanently.

Brakes working as they should.

12,000 miles ago had new rotors, pads and calipers replaced, brake fluid level is normal.

Ideas?

 

2 or 4 wheel ABS?

 

I guess I don't know. It's a Roadtrek class b motorhome on a 1 ton van dodge chasis. I'm not a mechanic, is there a way for me to determine whether it's 2 or 4 wheel ABS?

 

I have a 91 Roadtrek b250 and it has 2 wheel (rear wheels) ABS if that helps.

 

That might be helpful, mine is a 92 Roadtrek b-350. How did you determine if yours was 2 or 4 wheel ABS?

 

When I bought mine it came with the original spec sheet. Also, I have seen the sensor on the transaxle but there aren't any sensors on the front brakes.

 

A shop replaced the sensor on the rear differential, but the break and ABS lights came back on 3 miles later. When the shop plugs in their equipment to analyze the problem, nothing comes up, or it's (the vehicle) not communicating any problems. The shop took an educated guess at the problem, but now don't know where to go next in good conscience.

 

A shop replaced the sensor on the rear differential, but the break and ABS lights came back on 3 miles later. When the shop plugs in their equipment to analyze the problem, nothing comes up, or it's (the vehicle) not communicating any problems. The shop took an educated guess at the problem, but now don't know where to go next in good conscience.

 

There really isn't much to the RWAL systems, and the sensor on the rear diff is generally the culprit.... Also, I think you need the DRBIII (Chrysler scan tool) to actually talk to the abs module. If I recall correctly, it doesn't communicate thru the OBD port, but, has its own connector somewhere else....

In all reality, the RWAL systems on that generation of vehicles was pretty useless, and some folks just disable the system entirely, and call it a day.