Many thanks to all who have responded to my brake problem. I still have the same thing going on after replacing the master twice, the calipers twice, the rubber lines twice. he car has never hit potholes or such. i've replaced the pro valve, just put on another brake check valve today and still no luck. When I use a c-clamp to close the calper on the right side I heard a hissing sound coming around the booster area, and the caliper is very hard to close. The left side closes better when I c-clamp it and no hissing. The right caliper seems to have alot of pressure when I c-clamp it. This all started when I replaced the master
2 months ago. One day the brakes just faded to the floor so I figured it ws the master cylinder that went bad. Now I've replaced everything new and problems. All parts purchased are Bosh parts with lifetime warranties. Is a leak down test very expensive and can I do this myself? lost and confused this is keeping me up because I can't solve my problem and its really driving me nuts.