ABS Light Comes Off And On

Just for a giggle, check the brake fluid level in your master resevoir. If it is near the low line the light will come on. Adn since your there, check the connector going into the resevoir itself, the Bseries trucks were famous for rotting out the float level switch and turning on the abs light

Cosmo. Mazda Tech

Ok first answer. The ABS sensor on the back of your truck is on the top of the diff housing. We have seen a few of these go bad over the years. But what you should really do is find out what code is in your ABS system. There is a way to make the light flash the code by jumping a wire on the passenger side of the truck in the passenger compartment.

PM me for the info

Cosmo. Mazda TEch

One of the most common fault with ABS system occurs at the wheel speed sensors. Remember that the core of thes sensors is a permanent magnet. In the case where an ABS fault or warning light is on, you may very well find that the sensore is covered with metal particles it picked up on the road. These metal particles can cover the sensor, keeping on rather than letting it switch each time it sees a tone wheel or exciter ring vane, In addition, you also may find that a vane has broken off, giving the ABS computer the wrong wheel speed informationOf course, the mounting pads for the whell speed sensors are prone to corrosion in areas that use a lot of antiskid materials
These conditions can cause the wheel speed sensores to move toward or away from the wheel or ring, causing false signals to occur at the computer
Another common problem of today's system is corrosion and electrical of the cable that run from the computer to the wheel speed sensors. There supposed to be little or no electrical resistance in these wires.
However, there two main methods of getting the data from the ABS computer:
using a scan tool or the flash codes from the ABS warning light on the dashbord