Brake fluid keeps dropping?

Hello,

It sounds like you might have a brake fluid leak on the hydraulic system.
I would suggest that you have a look around the brake components at the wheels to check if you have any wetness, Best would be if you could safely jack up the vehicle and remove the wheels. this would enable you to inspect each wheel area more closely.

Please see examples attached below

If you cannot find any leaks and you still require to replace the brake pads and brake discs then please see a general description below.

https://www.2carpros.com/articles/how-to-replace-front-brake-pads-and-rotors-fwd

https://www.2carpros.com/articles/how-to-replace-rear-brake-pads-and-rotors

https://youtu.be/W1Bx2Gm_BuM

The YouTube is not the exact model but it cover a Chevrolet Sonic which is similar to your Vauxhall.

Please let us know what you find.

Boris