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Hydraulic brake light sensor troubleshooting

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Old Sep 26, 2016 | 01:17 AM
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Default Hydraulic brake light sensor troubleshooting

So i recently noticed some issues with my brake light. The light doesnt come on when i just brake with the rear brakes.

From what I found the part number is 72026-08A, correct me if im wrong here please.

Now the question is how do i know that the issue is with the sensor and not the connection?
Will i have to drain the brakes to install a new one?
 
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Old Sep 26, 2016 | 06:06 AM
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What year and model?
 
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Old Sep 26, 2016 | 06:31 AM
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Originally Posted by JohnMn
What year and model?
2009 fxdf fat bob
 
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Old Sep 26, 2016 | 07:33 AM
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The newer style sensor, which you have, is integral to the banjo bolt. You will drain the brake fluid, replace the banjo bolt, and bleed the brakes. You could try to clean off the connectors and reattach the wires to see if you can get it working before you replace it.
 
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Old Sep 26, 2016 | 08:00 AM
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Originally Posted by JohnMn
What year and model?
Originally Posted by WMX124
The newer style sensor, which you have, is integral to the banjo bolt. You will drain the brake fluid, replace the banjo bolt, and bleed the brakes. You could try to clean off the connectors and reattach the wires to see if you can get it working before you replace it.
Is there any way to troubleshoot and make sure its the sencor?
 
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Old Sep 26, 2016 | 08:11 AM
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You can check the switch operation with a multimeter
 
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Old Sep 26, 2016 | 08:35 AM
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Originally Posted by skid_pimp
You can check the switch operation with a multimeter
^This^

The pressure of the brake pedal being applied closses the circuit and on comes the light. So pull the two connections from the brake switch (the banjo bolt on the rear of the of the master cylinder) and set the multimeter to continuity with sound and connect it to both of the prongs. When you press the brake pedal, the multimeter should sound if there is no problem.







 

Last edited by cvaria; Sep 26, 2016 at 09:13 AM.
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Old Oct 19, 2016 | 08:00 AM
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I have the same issue I noticed last night, I have an '07 Street Bob. Is my brake switch the same or is it the older style that I can replace without removing the banjo bolt? After looking at mine it looks the same as the diagram but the leads connect to what looks like the switch that has the dotted lines running to it.
 

Last edited by jricharc; Oct 19, 2016 at 08:08 AM.
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Old Oct 19, 2016 | 08:13 AM
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I added a circle to where my leads connect to the switch. Is this correct?



Brake Switch Diagram
 
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Old Oct 19, 2016 | 08:31 AM
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Originally Posted by jricharc
I have the same issue I noticed last night, I have an '07 Street Bob. Is my brake switch the same or is it the older style that I can replace without removing the banjo bolt? After looking at mine it looks the same as the diagram but the leads connect to what looks like the switch that has the dotted lines running to it.
Yours is the older style which can be removed without removing the banjo bolt.
 
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