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Brake line junction block/warning switch o-rings. 700

After bleeding the brake system on my daughter's 740, I have a constant brake warning light. I have tried removing the switch and appling the brake, but the cylinder never moves. I can just barely see one of the o-rings through the switch hole as well as a little bit of brake fluid. I suspect the cylinder moved all the way back and there is gunk keeping it from returning to center. A replacement block costs at least $82.00. Does anyone know if the o-rings are a standard size, or if they are available separately?

Thanks,






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