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They don't "flex" like the old style rubber ones will so you get a more solid feel on the pedal. Now you will never have to replace them again, unless of course you rip them off the truck.

The hose replacement schedule is not a mandatory rule of law but what the manufactures who make the hoses say to do. I know most everyone never replaces their hoses until they break or leak, but just like your suppose to change-out the brake fluid every 5 years your suppose to replace the...

I know you'll like the PTFE hoses over the stock rubber lines. They will also last the life of your truck if they don't get damaged. No need to replace them every 5 to 10 years like the rubber ones.

I agree. I have never seen this much rust in a silicone system. Something is seriously wrong there. I would start checking your lines and the master cylinder for water intrusion. Maybe someone accidently added DOT 3 brake fluid to your system at one time, and it never got fully purged out. Since...

Are you running silicone brake fluid ?

You might have bought them a year and a half ago, but that doesn't mean they are that old. I bought one that lasted 6 months. The rubber was starting to get hard, but I ignored that and installed them anyway. Now I will never go with rubber lines again if I can help it.

Replace your hose's. This is a common problem. The inner lining starts to break down and you can get "flaps" of lining that act as valves holding brake fluid in or not allowing brake fluid to enter. I went with the PTFE hose for mine years ago and have had no problems since. These are the same...

Your right about the sticking piston issue. I have worked on 4 piston calipers on our buses and some other vehicles and they can be a pain.

Problem is almost all calipers are sliders. It is extremely costly to build 4 piston calipers and only aftermarket has them except for a very few high-end vehicles.