munters Posted December 2, 2015 Share Posted December 2, 2015 Does someone know how the caps work (Electric cables)? There is no resistance change when the floats are moved. Is it capacitiv? How to connect them in a 240z to use the dash brake light? In the 280zx Diagram one conector goes to ground and the other conector goes to the hand brake switch and dash lamp. This would all make sence if the floats would make contact to ground but they dont? Thnanks for youi input. Marcel Quote Link to comment Share on other sites More sharing options...
Miles Posted December 2, 2015 Share Posted December 2, 2015 (edited) On the 240Z the dash light is turned on by a differential pressure switch mounted on the fender below the master cylinder. The switch has a shuttle valve that moves to the low pressure side of the switch if there is a leak in the front or rear brake circuits. When the shuttle moves, it grounds the wire attached to it and turns on the red brake light on the dash. The shuttle also stops fluid from flowing in the low pressure side of the switch. So it tells you that there is a leak/failure in the brake system which most people would notice without the light.. After 40 years the shuttle is most likely corroded and stuck. The red light is also turned on by the parking brake. The 280ZX master cylinder has a float switch that is triggered when the fluid level drops for some reason. That is it. Why bother with it? Edited December 2, 2015 by Miles Quote Link to comment Share on other sites More sharing options...
munters Posted December 2, 2015 Author Share Posted December 2, 2015 (edited) The reason to bother with it are your 2 points. 240z corrodes and 280zx you see it before failure. Does someone know how the floats work as described in the first post? Edited December 2, 2015 by munters Quote Link to comment Share on other sites More sharing options...
Miles Posted December 2, 2015 Share Posted December 2, 2015 ok Quote Link to comment Share on other sites More sharing options...
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