Technical Fiat 500 losing braking fluid

[PhilE]

Hello, I have a fiat 500 66 plate and it keeps losing brake fluid. I have replaced the slave cylinder and master cylinder but no luck. The fluid level only seems to go down when the car is used which makes me think it's an issue with the pipes but does anyone have any suggestions into what could be causing this? Any guidance would be really appreciated!

 

[John202020]

Just to be sure is it the reservoir near the steering wheel, clutch or near the battery brakes?
If clutch check under the passenger wing for a leaking connector

 

[The Panda Nut]

If its the other one(battery side) possible leaking rear slave cylinders. Look at the base of the brake drums for oil. Or master cylinder look inside the car under pedals. If its brake fluid leaking stop using the car immediately and get it fixed as it could end up with no brkes at all. There are so many places brakes can leak you need to start at one end and check everything