Back home now - did my 200 miles and the brakes worked just fine and no faults popped up which was good. However, I was riding cautiously just in case the bike went onto residual braking which kind of takes any of the fun out of the ride (and someone will always go into that big gap you are trying to leave between yourself and the vehicle in front).
So plugged the GS911 in this morning and these are the faults that are in the history (history was cleared after rebuild of ABS unit 2 months ago) - all faults were not present now:
25165: Internal Control Module Error - main processor reset due to indervoltage - battery is fairly new and good - without a timestamp impossible to know when it occurred but probably nothing to do with brake failure warning coming on whilst cruising on motorway.
24951: ABS motor rear, defective - I assume it is talking about the rear whizzy motor for the servo part of the brakes. Don't know how the system determines a defective motor but motors whizzing away just fine for both front and rear brakes.
24971: Pressure in front wheel circuit to high - this is the fault I thought was probably closer to the what the actual problem is.
So I had a look at the realtime data:
Hmm now it's getting strange
From the realtime data it looks like the front wheel circuit is too low and not high although there are no faults currently present. I compared with the realtime data I noted a couple of months back and the front wheel circuit was about 16 Bar back then compared with 4 Bar now.
Also this time the Brake Sensor Drift Test refuses to run this time:
and I am assuming this is because of the low pressure in the front wheel circuit.
So my thinking for now is as follows:
1. I still have some air in the system (front wheel circuit) and the brakes need bled again.
2. There is another defective pressure switch - like this one I already replaced:
3. One of the pressure relief valves is stuck open - there are 2 of these but I don't know if they release pressure on the control circuit or wheel circuit side.
So right now debating with myself to either run through the above things and hope I can fix it - after rebuilding and cleaning the unit the brakes have worked better than they have for years - stuff like brake failure warning light going out with 10 feet of moving off which in the last few years would always take a lot longer - or just giving up on the whole thing and going for the servosectomy
There was some satisfaction in getting it all working again but I don't want the worry of riding the bike like a pussy just because I'm always worried the brakes are going to fail
Are there any servo assisted bikes out there with reliable brakes or am I fighting a losing cause