Brake light troubleshooting
Posted: Tue May 21, 2013 10:39 am
I have had an issue pop up, (haven't we all...) wherein my brake lights are not working. I have checked the bulbs and they are intact and should be lighting up.
I am seeking a 'troubleshooting' plan for locating the source of the issue. (Ie first test, then test...)
I have done some checking of the master cyl. light switches by pressing the pedal and checking continuity. One switch closed when the pedal was pressed and one switch did not (I can't remembmber which one at this point). When I did this test my thoughts led me to thinking about the 'primary and secondary' pump circuits and how they interact.
http://www.tegger.com/hondafaq/mastercy ... ematic.gif
(Just FYI for all): http://www.tegger.com/hondafaq/mastercy ... works.html
My thought was that if, during a brake bleed, air got into one of the circuits, would that make it possible for the brake light switches not function and therefore not send electrical signal to the brakelights?
I think that during a brake bleed this happened and is causing this failure.
If so, should I bleed out the master cylinder before moving on to each wheel bleeder (as if it were a new master cylinder being installed and in need of priming)?
Also, If one switch does not work, does that make the whole brake light circuit defunct?
I could get a new master cyl, and switches, though I don't like to fix/replace what ain't broke.
I am seeking a 'troubleshooting' plan for locating the source of the issue. (Ie first test, then test...)
I have done some checking of the master cyl. light switches by pressing the pedal and checking continuity. One switch closed when the pedal was pressed and one switch did not (I can't remembmber which one at this point). When I did this test my thoughts led me to thinking about the 'primary and secondary' pump circuits and how they interact.
http://www.tegger.com/hondafaq/mastercy ... ematic.gif
(Just FYI for all): http://www.tegger.com/hondafaq/mastercy ... works.html
My thought was that if, during a brake bleed, air got into one of the circuits, would that make it possible for the brake light switches not function and therefore not send electrical signal to the brakelights?
I think that during a brake bleed this happened and is causing this failure.
If so, should I bleed out the master cylinder before moving on to each wheel bleeder (as if it were a new master cylinder being installed and in need of priming)?
Also, If one switch does not work, does that make the whole brake light circuit defunct?
I could get a new master cyl, and switches, though I don't like to fix/replace what ain't broke.