So, I have a BB on my '21 Tour Trike. I put it on for the usual reasons, couldn't keep the factory brake adjusted, I have since removed the caliper. BUT, I have mixed results in that, after a ride, even a shorter one I often come back after parking half hour or so and all the pressure is bled off. The BB is still set though. I have found once I find this and pump and reset the BB it will hold for days., thie is absolute. I had it bled 3 times by dealers, the last one in communication with BB to try to get it right but to no avail. I then bought a brake vacuum and did it myself. Last summer I rode it up to KD Cycle from Florida to get to the bottom of it, (Roadsmith trike). Same results, good for a day or two but same pattern, and the pattern now is absolute. I can ride to a store or something and come back in 20-30 minutes and the BB is firmly holding. But later , for instance I will park in my garage and an hour or so later pressure has bled off. The only thing Kevin at KD says that it must be in the ABS system somehow, somewhere, where we don't get all the air out. And that's where we are at the moment. I like the BB and do not think it is in the device
( did replace it once to be sure, no charge from BB).
All that said to say I carry a small wood block for anytime I park on an incline. I can't totally trust the brake to stay holding, but again, I do not believe this a problem with the BB itself. I got the same result with a velcro strap as a diagnostic test. If anyone has an incite I would love to hear it.