Hi, new member, name is Robb. I just bought a new/used XJ750 Seca... it's in really nice condition, relatively low mi (14K) but has a ridiculously hard brake pull on the fronts. I pulled the calipers off and found both pistons were froze solid. Was surprising the front brake even worked. Just bought the K&L Brake Caliper kit 32-1602 from Amazon and I've never been so confused when ordering bike parts before. It seems K&L is the ONLY manufacturer that makes a rebuild kit for the XJ750 Seca Even if I go to my local Yamaha dealer they only carry the K&L kit, no OEM. For some reason K&L refuses to say exactly what this kit contains, only saying "contains all the necessary rubber parts to rebuild one brake caliper. One of the main sources of my confusion lies in the fact that when I disassembled the calipers, there wasn't a dust cover on the outside of the cylinder that the piston passes through, as shown in some diagrams. Instead, the cylinder has 2 grooves for 2 O ring seals. Does one of these grooves act as a dust seal and the other as a fluid seal? Even the online Haynes manual shows the piston coming through a bellows type dust seal. There was a heavy ring of crud around the outside of the cylinder where the piston passes through, which I suppose contributed to both pistons freezing in the cylinders. Also a note on K&L... typical arrogance from a company with a niche monopoly. Customer service very unfriendly and unhelpful, and today marks the 3rd day that they've been sitting on my order which is yet to be processed let alone mailed. But enough with them... one of those companies you're forced to deal with. My main concern is what's the deal with the double grooves in the cylinder and do I need to order that outer dust seal or will the 2 O rings/seals inside the cylinder suffice? Finally, I've been lurking a bit and this is my first post. I look forward to exchanging ideas and picking up tips from all of you. I really enjoyed riding my new/old bike for a week before I just couldn't take the hard brake pull anymore (had been hoping things would loosen up as the bike woke up from a 3 year coma the PO left it in) I sold my FZ1 earlier in the summer, being a few grand short on a new car I was buying... got a great deal on this bike, only problem is this brake thing. And the XJ fills the void beautifully.... and for just a few hundred bucks. Thanks in advance for the responses and nice meeting you all.