Work to replace a 19 year old master cylinder that has failed. Holds pressure and feels nice and firm on the pedal. The only minor downside is the lack of a leveling kit, but that's not a big deal if you have everything you need to complete it. Edit: Just an additional note for those delving into the brake system hydraulic circuit for service. Make sure there is flow from the bleed valve on all four wheels. I almost thought this part was bad, but it turned out that the wheel cylinders were badly clogged with old deposits from the old brake fluid. Once I got the rear wheel cylinders clean and flowing, the bleed process was 100 times better and easier. Be sure to change your brake fluid at least once a year to avoid these problems!