ABS problem is hurting my brain

[slovcan]

Hi folks,

Well, what I thought was a routine ABS sensor failure is not. When I bought the car the ABS warning light would come on sometimes when the car was started. and always go away after the second start of the day. Then it would stay gone.

As time went on the light would stay on every morning until the restart after driving for a few minutes. Then it progressed to having to drive further before the restart. Finally, it got to the point it is at now - the light just stays on.

When the light is on the cruise control doesn't work. That points to the left front sensor failure or wiring problem. Braking stays normal and feels smooth. You'd never say anything was wrong apart from the warning light. Of course, I'm sure the ABS wouldn't function.

The last time I was the in Slovakia I had the left front sensor changed and the hub cleaned up. It wasn't bad at all. BUT, the new sensor caused immediate roughness and noise when braking normally. We put the original sensor back in and normal, quiet, smooth braking resumed - undoubtedly without functioning ABS. This was the fall of 2019.

My friend just had the new BEBI-Bilstein Made in Germany sensor installed today. The warning light still stays on. That's an MOT fail. He will ask them to drive the car out in their parking lot tomorrow to see if braking feels normal with this new sensor or not. They also cleaned all 4 hubs.

So, now I am at a loss. Can someone advise the next step, please?

Thank you,
Glenn