Anyone have any experience or knowledge / reviews of these pistons? https://jpbrakes.com/products/jpb-v3-brake-caliper-piston Thanks...!
They still have storefront template items on their site, on the page advertising their premier product... That said, the pistons do look purdy.
So, seeing as they list KTM MX pistons and I've personally melted pads on a 150SX used as a sumo, tech question: The premise of these pistons is minimizing heat transfer from the pads to the caliper by minimizing piston to pad contact area, and venting the contact points. There is also some tricks to improve piston cooling overall but I'm considering those secondary at the moment for my question. As noted, I'm melted pads down, would I have melted them sooner with these style pistons as they wouldn't have been able to shed heat into the caliper body as a heat sink? Is there designed heat transfer from pad to piston?
I believe that the intent is for the ventilation added between the pad and the piston to provide cooling for the pad. That said, I haven't used these - though I am considering them - so I can't speak with anything more than what I've read from the company themselves. For what it's worth, I'm also looking at https://braketech.com/caliper-racing-pistons/ which seem to be more common. A big part of what I'm looking for is better piston retraction, which both companies list as a benefit.
Have you considered different pads? Our first year running AMA nationals Tyler was melting his R6 pads in practice at Road America. His teammate Bryce Prince wasn’t having the problem? I went and bought sanding stuff to clean the rotors and put in new pads. Did it again. They were GoldFrens. Went over to Mark Junge and got some Vesrah’s and the problem went away. Bryce had it happen during the race.
Yeah, I had switched to a more aggressive sintered pad looking for more bite, trashed them in two practices on a longer track than I had been running, switched back to OEM pads and they held up fine.
Interesting. It's kinda nuts that you melted the pads before boiling the fluid. I’d bet in high end brake applications, the brake fluid will boil long before you melt a pad. So these pistons are design for them. I agree that you wouldn't want to use these on a diff application where melting the pads is your first concern.
