I noticed that by putting a pressure of 1 bar only see 0.9 it worked very well, and so we took less risk to the tubes leading the brake fluid, driven by pressure out of their housing and sprinkle all those around! Indeed no collar does secures the pipes leading the brake fluid between the reserve of the device and the car's tank.
Please note also the brake fluid reservoir of self that is often simply pushed into the master cylinder and which may leak or become dislodged under too much pressure. Do not hesitate to put rags and / or newspapers to prevent incidents.