Originally Posted by floridawing
Hello, I installed new brakes and discs and drained and replaced the brake fluid on my Rocket. My brake reservoirs are attached to the master cylinders. I tried to pump fluid from the bottom up. Unable to get any brake pressure. We tried to pump fluid from the top down releasing pressure at the caliper. No luck. My fluid reservoirs and not the highest point in the system. Any help would be appreciated.
In general, because of the large loop that rises above the gear legs before brake line drops lower at the fire wall and then a second flex loop up and back down to the master cylinders on the pedals, it takes lots of rapid flow to clear all the air out. Best results happen when you have a temporary return line out of the reservoir top/vent out of the cockpit and back down to the bottle you are pumping fluid from into the bottom bleed fitting. A see through return line lets you know when there are no more air bubbles returning.
I have owned other homebuilts where the brake line was a 100% uphill path from the bleed fitting to the reservoir top. With that you could slowly use a syringe with the exact volume of fluid needed to slowly fill from the bottom with no return line- and get rock solid brakes every time. Rockets and most RV 4's are NOT that way.