Hey everyone this is Edan, the owner of Silver Mine Motors. I just wanted to give my side of the story. I'm my defense Those Wilwood master cylinders are bought from Wilwood. They are not a part that we make! We simply buy them for $108 and sell them to the community for $135. they come packaged in a plastic a bag from Wilwood. I have had this exact problem happen 2 times since we started selling them, and also one time a reservoir cap broke. I always try to provide my customers with exceptional customer service!!!! Many times I will send out new parts in exchange for defective parts from suppliers like Wilwood. In the past I would ship out replacement parts the same day a customer asked me to. I would trust the customer to return the defective parts a few days later. Those customers NEVER send back the defective parts! not even once! That's why I stopped doing that. People take advantage every time. These days I wait until I receive the defective part, then ship out the replacement. I feel that I handle these situations in a way that is fair to all parties involved. Obviously no one is happy when parts are defective, but we need to fix the problem, move forward, and forgive and forget. It also helps to realize that we are all humans that occasionally make mistakes. I'm sorry I sent you 2 left side calipers. I hope there are no hard feelings. Edan