The light only came on after the technician disconnected the ABS unit.
The problem was that that the ABS unit made a grating noise when I switched the engine on after it was re-charged. This was a repeated noise like something scraping or grating on something else. When the technician detached the ABS unit the noise stopped.
The thing is, I had never heard this noise before, it only started after the re-charging. However, the technician said it meant there was something wrong with the ABS unit. I don't understand how this could have suddenly happened.
Judith, assuming the technician only boosted the vehicle to get it started and then let it run long enough to charge the battery, then he did nothing that would cause the ABS system to malfunction.
The technician is perfectly honest in mentioning that you can drive safely without it, but then you have the annoying warning lights that tell you the system is inactive because of a fault detected.
Without inspecting the vehicle it's almost impossible to tell exactly what's wrong with the ABS system, but repair can be costs can range greatly depending on where the fault is found.
For what it's worth though and ABS pump that is activating for no reason is usually not a good sign as it generally means the electrical unit in the pump is damaged and initiating activation.
Judith, i hope you find this information helpful and it warrants a kind rating on your part. If you need additional assistance please let me know.