ABS light
The anti-lock brake system light on my dash comes on occasionally and randomly. It doesn't come on every time I drive. It may not come on for hundreds of miles, like all the way from Sedona to Oregon...
Forum Discussion
Trying to pull everybody's responses together...
Because you live in beautiful dry Sedona... I'm thinking you might be less likely to have dry rust around the front sensors. By "dry" I mean NOT in a closed, oily lubricated area like the rear axle.
Based on that, I'd still like to see if you an access the sensor for the Rear Wheels. The RockAuto site shows NO sensors for W-series, but does show them for P-series (the bread trucks, UPS/FedEx trucks, etc. Here's a picture of one.
The Sensor part of it is below that reddish O-Ring that seals it into the lubricated environment which could be a rear axle (like Ford) or a transmission (that seems to be the case with Chevy/Workhorse). The connector is probably two-wire (if similar to Ford) and goes into the oval shaped hole. The little triangular "shark fin" sticking up latches the connector.
The RockAuto lookup (again for P-series, they don't show them for W) shows two of these, transmission mounted, identical, one for Input Rotation the other for Output Rotation. Output would be the same as the front of the Driveshaft. Ford uses the Differential for its sensor position, equivalent to Output on Chevy, probably same on Workhorse.
I'm hoping an RV Tech jumps in on this. I can see how the Ford style, axle mounted, can pick up "dross" from wear on the differential gears. Transmission pans often have a magnet in them to trap that dross, but I suppose a transmission-mounted sensor (sometimes called VSS for Vehicle Speed Sensor) could still trap dross even with a pan magnet.
In the absence of more info, I'm for finding the VSS (one or two on transmission, maybe one on axle). Clean the area around it/them, then pull, clean, put grease on O-Ring, reinstall. Cost is $zero. See if anything changes.
Because you live in beautiful dry Sedona... I'm thinking you might be less likely to have dry rust around the front sensors. By "dry" I mean NOT in a closed, oily lubricated area like the rear axle.
Based on that, I'd still like to see if you an access the sensor for the Rear Wheels. The RockAuto site shows NO sensors for W-series, but does show them for P-series (the bread trucks, UPS/FedEx trucks, etc. Here's a picture of one.
The Sensor part of it is below that reddish O-Ring that seals it into the lubricated environment which could be a rear axle (like Ford) or a transmission (that seems to be the case with Chevy/Workhorse). The connector is probably two-wire (if similar to Ford) and goes into the oval shaped hole. The little triangular "shark fin" sticking up latches the connector.
The RockAuto lookup (again for P-series, they don't show them for W) shows two of these, transmission mounted, identical, one for Input Rotation the other for Output Rotation. Output would be the same as the front of the Driveshaft. Ford uses the Differential for its sensor position, equivalent to Output on Chevy, probably same on Workhorse.
I'm hoping an RV Tech jumps in on this. I can see how the Ford style, axle mounted, can pick up "dross" from wear on the differential gears. Transmission pans often have a magnet in them to trap that dross, but I suppose a transmission-mounted sensor (sometimes called VSS for Vehicle Speed Sensor) could still trap dross even with a pan magnet.
In the absence of more info, I'm for finding the VSS (one or two on transmission, maybe one on axle). Clean the area around it/them, then pull, clean, put grease on O-Ring, reinstall. Cost is $zero. See if anything changes.
