Modern Vespa

Hi forum community

I had a seized front caliper that I replaced with a brand new one and I am unable to bleed the brakes no matter what I've tried.

First I tried bleeding the traditional way, open bleed nipple pull handle, tighten nipple and repeat. I must have put over a litre through the system with no joy.

Then tried pumping the brakes until the front wheels held on the calipers and secured the handle with a cable tie and left for 24 hrs to see if the air would rise out of the system, again no joy

I then tried forcing fluid up through the calipers, to force the air up out of the system and this didn't work, as there's was something stopping me from depressing the pump

I'm lost on what you do and would really appreciate any help.

Sounds like there is air in the ABS pump.

Take it to a Piaggio/Vespa dealer that has the PADS tool to clear the codes and force bleed the entire system.

If the pump has been run dry for too long you will be on the hook for a new ABS pump.

At one point I had to put my rear tire on my motorcycle lift with the front tires on the ground. And lift it as high as I could. And I was finally able to get the air out when I got the leader screws at the top of the system. Really stupid design to put the bleeder valves on the side instead of on the top where the air is. Lazy design. They use it on another vehicle so let's use it on the mp3.