Got the same ones from IIIpro brand. They work flawlessy. No overheating, plenty of stopping power. Very happy. They use mineral oil. Set-up is pretty simple and brakes come filled and prepped. on this site you can find more topics about them

Hi all, just wanted to share my experience (again) on these brakes. Still on my rigid hardtail/gravel bike and loving them. Absolutely no loss of power or any other signs of fatigue after using them for quite some time now.

Last week I installed them on my XC bike aswell as on my fathers. Already the 3rd set of sram level TLM's we're trowing of the bikes to replace by these chinese brakes. The difference is huge. I now can actually stop when I want 

On my rigid bike (size S) the rear brake caliper touched very slightly on my rear triangle frame. I don't have this on my XC bike (same frame but size M). So I guess that normal build people will have no issue installing them.

Will keep you guys updated if anything should break or happen. No news is good news 

I actually had the ZTTO brakes on my bike (rigid HT with gravel 40mm tires) and although they performed really well, I  swapped them for the IIIPRO 4 pistons. The lever was too far to reach and kind off awkward build. Goes very outward so I never could reach it completely. Almost crashed in a tree doing some twisty singletracks because I had to loosen my grip on the bars to brake and slid right off with 1 hand. Now if you have bigger hands or longer fingers, the brakes could work for you because they had a nice bite and great brake performance. As I said, I now ride with the IIIPRO's, these are really great (and lever travel can be adjusted). Did now some 400km or so with them. Terrain is something between gravel and XC. Used them in the mud, dry, cold,... always equal power. Somewhere on this page I reported my findings so far. Nutshell: great stopping power, nice design, lightweight, rear caliper is touching frame so rubbed a bit in beginning (frame specific I guess), Bolts are not great quality but easily swapped. Overall really happy. Once I have more "test data", I will likely purchase a second set for my XC hardtail.

Some feedback after using the brakes for a while. Did around 400km with them now and I'm very pleased. Packaging was very good. Some things to look out for: bolt that keeps your pads in place is strange dimension of torx. Combined with loctite or paint, the bolt was very tight when delivered, that made that I almost completely stripped 1 bolt when trying to swap my pads. Ordered some gold titanium bolts to replace anyway, so not that big of an issue. Same thing applies for the bolt that clamps down the brake on the handlebars. The clamp to hold the brake lever can be installed without removing your grips but it is a narrow fit. Installing is pretty straight forward. Lines are filled. Rear brake is not assembled but has plug in it so easy to install. I needed an extra hand to mount the clamp and the lever. You need to hold the leverhousing in place, hold and push together the clamp and then put the bolt through. So for that step I needed 5min assistance. On the rear the caliper is completely outward and touching my frame. The disc rubs just a bit in the beginning. This means that 1 side doens't move all that much. But I guess this is frame specific (Bergamont revox team) because I had the same thing with the sram brakes.

Now over to my findings of performance: They are way better than my sram Level TLM/ULT. Didn't swap my lightweight rotors to compare and it's a world of difference. The lever travel is easy to set so my short fingers can reach the levers. They are very snappy when releasing. They have a lot of stopping always. Did rides in dry and very wet/muddy situations and they never failed or gave the impression that they lacked power. I'm very happy with these brakes because they didn't break the bank, shaved 100gr of my bike and have infinite more bite and power than my sram brakes. Will keep riding them to get a more long term view but for now it seems that I will get another set to put on my XC bike.

Does anyone know what alternative brake pads will fit the 4 pot version? My guess is that the brake will be delivered with something that will work but can be improved. So I would like to get a headstart and order some "mainstream" brake pads to swap in when the brake arrives. THX for the info!

Just bought the 4 pots IIIpro's in blue. Discount was better than the oniri for some reason. will update once I have them. I will test them out on my "extra" rigid hardtail. If they perform well, I would move them to my XC bike. But all to be seen. Will update my findings. hopefully they stop better than my sram levels which are quitte underwhelming

Any new updates? It seems that Zrace now has changed the red caliper bolt to grey for more minimalistic look. IIIpro E2 and E4 also seem to offer the same brake but in different colors. Yet I see some differences between photo's (even on same product page). Some levers have drilled holes, others don't. Some have a turning knob for lever travel, others just have a bolt. Seems like a bit of a gamble on which version you will receive. However these are just minimal points. would like to know some real life experience on these brakes. Would be intrested in buying a set for my gravelish XC bike. Could help to get weight down to around 7kg without breaking the bank