My 4.3L 4x4 base pickup has the abs engage everytime Im braking at 5-6 mph replaced abs module front wheel sensors and speed sensor on tail of transfer case bleed the abs module with diagnostic tool still engaging when taking it up the road the rear speed sensor trails behind the front and when braking it dips to zero when abs engages the others don't went and cleaned the connections on the ecm nothing what do I do next
The following can also cause issues like this -
- Cracked Reluctor Ring
- Rusty Reluctor Ring
- Worn wheel bearing (allows the ABS sensor to move away from the reluctor ring)
- Rust stopping the ABS sensor seating close to the reluctor ring
On some vehicles it is easy to see the reluctor ring, on others you may have to remove the sensor to view it. Do they look clean and are firmly attached? Can you see any cracks?
Check the wheel bearing for play.