I've been having trouble with the 3/4" master cylinders on my SUV for a while. I had to constantly bleed the brakes. There was no air in the system. So I assumed that was it Problem wasn't enough displacement, so I switched to a 7/8" bore. I installed this new master cylinder and didn't have to brake at all and it stops the car quickly. A big improvement over my previous master cylinders and I am very happy with the product.