“ No, brake warning switch not removed - thought would just let air enter through there? Or it it not opening into hydraulic system just into space between both circuits? ”
No air will enter and no fluid will leak out as that’s the way it’s designed.
Here’s a screenshot from the Service manual for the 1800E, I believe it’s identical to yours, the warning valve switch is the same for the 164, 140 and 1800.
Figure 5-40 in the attached is incorrect. It should show the piston moved to the right, and the plastic plunger extended into the narrow part of the piston.
Last edited by c1800; Nov 28th, 2021 at 00:58.
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