CMS

[mralex714]

The brake fluid light on the CMS is on, fluid levels are good and the floats move freely. In addition the icons on the CMS are very dim at night but look fine during the day. Any thoughts?

[Condor]

There's a rubber baffle located in the rear brake reserve that will expand when low on fluid, and then hold the sender float down when topped off so the sender reads that the reserve is low on fluid. Take a coat hanger with a small 'L' on the end and lift a few of the pleats back into the top thru the fill hole and the CMOS light should go out. You may not be able to get them all folded back up, but a couple will do..... The other alternative would be to remove the reserve and open it up to fold the pleats back up.....

[cowpuc]

There's a rubber baffle located in the rear brake reserve that will expand when low on fluid, and then hold the sender float down when topped off so the sender reads that the reserve is low on fluid. Take a coat hanger with a small 'L' on the end and lift a few of the pleats back into the top thru the fill hole and the CMOS light should go out. You may not be able to get them all folded back up, but a couple will do..... The other alternative would be to remove the reserve and open it up to fold the pleats back up.....

 

GOOD ONE JACK!!

 

Never ever did know that brother!! You da man!!

[Max]

The brake fluid light on the CMS is on, fluid levels are good and the floats move freely.

 

Had same CMS light with rear brake a few years ago. Some members onboard helped with fix (BobNY?) The relay inside the float post was stuck (open?). Because it`s

encapsulated there is no way to get at it for repair. Bob gave me a spare but after a short time same problem. Final solution, cut the 2 wire connection at the resevoir and twisted

the ends together to extinguish light. Check fluid level routinely , no issues with it to date.

[Prairiehammer]

My 1991 has the same affliction. The brake reservoir light sometimes comes on, sometimes goes off. Most of the time it is off, but occasionally it is on.

The brake fluid level icon that pops up on the CMS is monitoring BOTH brake fluid reservoirs; front and rear reservoirs each have the float with a magnetic reed switch.

When mine was displayed, I jumpered the rear reservoir float switch wiring (white/black and black wires) and the icon did not extinguish. I jumpered the front reservoir reed switch (white/black and black wires behind the headlight) and the CMS "low brake fluid" icon did not extinguish.

Each of the "float switches" (reed switches) are normally closed and open if the magnet within the float passes below the reed switch within the post that the float moves up and down on. When the float slips low enough the reed switch opens, causing the low brake fluid icon to light. Jumpering the pertinent wires should extinguish the icon with no regard for the actual float position. If the icon does not extinguish with both reservoir switch wires jumpered, then the problem lies in the CMS. It will probably be an intermittent connectivity caused by a bad solder joint in the CMS. It may also be caused by an intermittent connection between the reservoir switch and the CMS, but my experience has shown that there is no other connection between the reservoir float switches and the CMS except the ones you should jumper to diagnose the problem.