I'm having a problem identifying who the original manufacturer may have been for the BIKTRIX XD=E300 Hydraulic Brake system. Last year I purchased a Eunorau brand fat bike which was supposed to come with PROMAX Hydraulic brakes. Instead these are the brakes the ebike came with. Problem now is that I want to extend the hydraulic line on the front brake. I have found no information on the internet concerning this brand of Hydraulic brake system. To make matters worse, I contacted BIKTRIX about these brakes and they sound as confused about them as I do. They haven't given me any answer yet only asking me how come I have BIKTRIX brakes on another branded ebike other than BIKTRIX. I checked my original ad and paperwork and I was supposed to get PROMAX brakes instead . Still waiting on confusing answers from both parties. All I really need to know is what company originally made these brakes for BIKTRIX. I can then cross reference a brake bleeding kit, line kit, and figure what brake pads to buy when needed. I mean I cannot find anything about these branded brakes even on AliExpress.