I've been having trouble with the 3/4" master cylinders on my SUV for a while. I've had to constantly bleed the brakes. There was no air in the system so I assumed the problem was a was insufficient displacement so I switched to a 7/8" fitting. I fitted this new master cylinder and have not had to brake at all and it stops the car quickly. A big improvement over my previous master cylinders and I am very happy with it Product.