2002 Land Rover Discovery - ABS light, Tractions Control light and Hill Descent light all on. Vehicle runs fine. Same situation occurred on our 2004 Land Rover Discovery and I beleive it was some type of sensor which needed to be replaced.

check wire that goes down to the hubs

No, it is a warning to you that your breaks are wearing away and need replacement.

Note that after you replace them, you will have to go to a computerised mechanical workshop to reset the abs detection settings to the computer detection system (Dont worry, the mechanics there will know what to do).

first check the abs sensors wiring and connections if good than have the truck scanned most auto stores such as auto zone/advanced auto will scan vehicle for free check ur local area the trouble code will narrow down ur problem so it can be repaired

Read my post on landrover enthusiast comes under abs last resort lozzzz

Suggests either Wheel Bearing, ABS Sensor Fault, or Shuttle valve. Best to get it to a dealer and on the computer for them to diagnose what exactly is wrong.

Can't be reset if your ABS system or some component is faulty. check speed sensor on the wheel bearing, is there any rubbing or dull grinding noise coming from the front wheels? could be the entire bearing and speed sensor assembly has gone bad. this would cause all these faults to appear as that sensor triggers all these events in order to slow your vehicle while it downshifts itself and applies breaking to control the vehicle as a part of the stabilization system. The alternative is that the ABS system is not functioning properly and the trac control and hill decent systems are being deactivated as part of the fault. If the system cant apply breaking then the systems are rendered unavailable. the vehicle will stop but not using ABS just regular breaks. Check all ABS break fuses for damage.

It's an ABS issue, and you need to get it to a dealer (or someone with a T4, Testbook, Rovacom, Hawkeye, or Nanocom system) for the ABS codes to be read properly.
Odds are? Shuttle valve, Wheel sensor or Wheel Bearing.

you've got a bad wheel speed sensor or corresponding tone ring. take it to a dealer. they'll hook it up to a computer and tell you which sensor or tone ring it is and give you an estimate. you only pay for the hour of diag.

check abs sensors and controls for loose or damaged connections if none have vehicle scanned for fault or pending codes a part or sensor may be going bad at an auto store such as auto zone and advance auto do it for free

probably the shuttle valve in the ABS unit is defective, solution renew shuttle valve, dont let dealership sell you a new ABS unit very expensive