I would strongly suspect a damaged or disconnected ABS sensor - have the code read it will point you to the problem area - there are usually two codes per sensor , one if it doesn't detect the sensor at power up, and a second if it does the detect the sensor, but doesn't see a pulse train from the sensor after the vehicle starts to move.
Rise height sensor at the rear - never heard of it.
Some vehicles will have an LSPV, what this does is adjust the rear brake effort based on the load in the vehicle, which it senses based on the ride height, or more accurately the distance between the axle & the frame - this LSPV may be what you were told about.
The LSPV is old technology, the same compensation can be done with the ABS, but, some early ABS vehicles still have the LSPV, a "non-ABS" Tracker will have the LSPV on the right frame rail, connected to the axle with a spring - I don't think the ABS equipped Trackers do, but all you need to do to confirm is to follow the brake lines down the frame rail and see where they go, if they end up at a contraption connected to the axle with a spring, then you have an LSPV - make a bracket to extend the spring mount on the axle by whatever height you lifted the rear.