1994 - question re: brake fluid level sensor - how does it work?
Thread Starter
Advanced
Joined: Apr 2019
Posts: 77
Likes: 2
1994 - question re: brake fluid level sensor - how does it work?
Just a question as to how does the sensor work, i.e., sense the fluid level? I understand, as least I thing I do, as to how a "non-contact" optical fluid sensor works if mounted outside and on the side of the fluid holding tank. However, the sensor on the 1994 slides thru the bottom of the brake fluid reservoir. Two question: is the sensor based on optical sensor technology or ???, and if mounted to the bottom of the reservoir vice the side how does it sense the proper fluid level? Maybe I am just dense but did many web searches and could not locate the answer to my question. If someone can explain the technology used or point me in the right direction it will be appreciated. Thanks Bob
Advanced
Joined: Apr 2021
Posts: 61
Likes: 27
From: East Central Tennessee
I can't say specifically for this exact sensor as I've never taken notice of it but in the powesports vehicles I wrenched on before I retired, the fluid level sensors are magnetic switch sensors. So either the float has a small strip of metal and the sensor itself uses a magnetic switch. Or, vice versa, the float has a small magnet and the switch/sensor is pulled closed when the magnetic float come near. But, either way is a magnetic proximity switch.
Pro
Joined: Mar 2007
Posts: 594
Likes: 354
From: Mt Prospect IL
2025 C4 of the Year Finalist - Unmodified
It’s called a Reed Switch. When a magnet comes close to it, the switch closes and completes the circuit. There is a magnet mounted in the float and when the fluid level drops it gets close enough to the reed switch (outside of the fluid reservoir) to close the contacts and the brake warning light illuminates on the dash.
Thread Starter
Advanced
Joined: Apr 2019
Posts: 77
Likes: 2
94 brake fluid level sensor
It’s called a Reed Switch. When a magnet comes close to it, the switch closes and completes the circuit. There is a magnet mounted in the float and when the fluid level drops it gets close enough to the reed switch (outside of the fluid reservoir) to close the contacts and the brake warning light illuminates on the dash.
