[Brendan W]

The easy suspects here are the fluid level and the handbrake switch. If there is a strainer in the neck of the reservoir you can be fooled as to the actual level and hand brake switches seldom go on the blink but worth checking.

Pad wear indicator wiring is another issue but generally they only show up after work on the brakes and someone has been a bit careless.

After that have a search around down in forums/problem solving/ask the experts

A code read would help. You could download the free Torque app and buy a wifi or bluetooth ELM327 interface for about a tenner. That app is good enough but somewhat limited and the code may be generic.
The fact that it comes and goes would make you think a switch or wiring.

 

[Brendan W]

With some cars, if it comes on going around corners it's a strong pointer to the fluid level.

 

[Brendan W]

Hi Skipper and Welcome
What exactly are your symptoms?
Top up the fluid first. Monitor the level closely and keep looking for leaks if there is a noticeable drop in a shortish time like 5mm in a week.
Concepttiling replacing the sensors did not fix his problem. Simple problems are common and it's better to keep things simple at least at first. Going hi tech too soon is not the best way to fix things.

 

[Brendan W]

Don't know the oil grade but....
If you top up when you replace pads the level is a very good indicator of pad wear, leaks excepted.
Level low, pads need replacing or checking at the very least.

 

[Brendan W]

92000 on a modern car is barely run in. The oil matters. 0W30 sounds petrol 0W40 diesel. The ACEA rating is important as well.
The owners manual has vanished?