Having read how difficult I found bleeding the rear brake, Brad Baument was kind enough to share his method with me. For those who don't know Brad, he was co-founder of RYP with Ryan Young and remains a very busy man with the AMA. He also competes on an ePure Race.
Brad developed this technique while working on Shercos at national events where multiple bikes must be processed quickly. He got it down to 30 minutes, which included removing the rear wheel and exhaust system. Since the EM chassis is basically a Sherco/Scorpa design, the technique is applicable to a variety of trials bikes. Of course, the EM has no exhaust system with which to contend.
My criticism was that this method requires 4 hands. Brad countered by saying the caliper and master cylinder must be clamped into their new positions. I shot two photos of this for illustration. The technique boils down to the following:
1. Dismount the master cylinder and get it high. The reservoir must also be dismounted.
2. Dismount the caliper and get it low. Insert something to substitute for the disk.
3. Use a tool to push on the master piston. It's imperative to get the full stroke and allow the piston to return completely.
4. Bleed as you normally would from the nipple.
Eventually, I achieved success with this method but still experienced a difficulty I attributed to my addition of a pressure transducer (which can be seen in the header photo). A lot of twisting and contorting of the caliper was needed in an attempt to dislodge air trapped in the transducer and fitting.
I have no doubt the method works well without the added complication of a pressure transducer.