General Category > ABS related issues

Another ABS problem

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ManxGS:
Good evening everyone. This is my first post so go easy on me. :D I've a beautiful 2004 R1200GS with only 2700 miles on her. She sat for 10 years in a dry garage and apart from dust wanting cleaning of her she's showroom.  New battery and a service and we're off. 250 miles later and I have to leave her outside overnight, it rains and when I go to start her the next day, ABS failure, warning triangle, and no servo on the rear circuit.  911 reads 1 code present. 
24972 Pressure in rear wheel circuit too high.   when I read live data, battery 12.36v, pressure front circuit 18.17bar, rear circuit 47.11bar, and when I press both levers front operates motor but rear does not, and the live data says front not operating and rear is?????   weird.
Any help will be greatly appreciated.

Alexm1:
ManxGS, the first thing to try would be a full brake system bleed, both wheel circuits and control circuit. The fluid will likely be quite contaminated so you need to ensure the system is fully flushed.
Probably not contributing to your problem but worth thinking about is the OEM brake lines, they are likely soft and replacing them with braided lines will improve the brakes performance.

ManxGS:
OK. Fluid all changed and no nasty's found. Same problem persists. What I can't understand it the pressures recorded on live data with all the nipples loose. Front 18bar, rear 62bar. Also the data shows that the front switch isn't working yet the light and motor runs, and the rear switch does work yet the motor does not run.  Should there be any pressure reading when idle?? :(

Alexm1:
I am missing something here, "all nipples loose", do you mean open? And you are still getting pressure readings?
Check the switches physically and electrically if you are able, get them out of the equation.
What colour was the control circuit "old" fluid?
Have you performed the brake pressure test?

ManxGS:
Yep. All nipples open, all of them just incase there was some trapped pressure in the circuit somewhere. How do I test the pressure sensors? are they inside the ABS block or outside on the circuit somewhere? The fluid looked like fresh out of the bottle.

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