 Emergency brake warning light keeps flashing and fuse #9 |
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| Geezer914 |
 Jul 14 2013, 05:23 PM
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#1
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Geezer914  Group: Members Posts: 1,921 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States 
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(IMG:style_emoticons/default/headbang.gif) The emergency brake light warning light keeps flashing even when the wire to the switch is removed. Also fuse #9 (7.5 amp) keeps blowing. Any ideas where to start to track down the electrical gremlin??? Thanks
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| Eric_Shea |
Jul 14 2013, 06:10 PM
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#2
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PMB Performance Group: Admin Posts: 19,304 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains  |
Remove your seat and follow the lead back to the harness. Did you tape it off when you disconnected it? It may be pinched in the seat rail. 80% chance it's in an area from the switch to the harness in the tunnel.
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| Eric_Shea |
Jul 14 2013, 06:15 PM
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#3
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PMB Performance Group: Admin Posts: 19,304 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
Also... Find out what else is sharing that fuse. Something may have grounded and melted the wires causing the HB light to be grounded and on all the time.. So, after chasing the lead under the seat I'd pull the gauge and follow that wire.
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| Dave_Darling |
Jul 14 2013, 06:16 PM
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#4
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914 Idiot Group: Members Posts: 15,161 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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Which wire to which switch was removed?
There are two switches that blink the light, one on the master cylinder and one on the button under the brake handle. --DD |
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| Eric_Shea |
Jul 14 2013, 06:22 PM
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#5
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PMB Performance Group: Admin Posts: 19,304 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
Good point. Forgot about the MC switch.
Turn the wheel to the right and see if you can reach in and reset the switch. Last one I did that on was Gints 911. Don't do that until you've verified that the MC isn't leaking though. Still doesn't explain the fuse blowing though. |
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| Geezer914 |
Jul 15 2013, 06:08 AM
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#6
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Geezer914 Group: Members Posts: 1,921 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States
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It was the brakelight switch on the master cylinder. I replaced the rear calipers the other day and bled the system, so it must have tripped the switch. I did not know the brake pressure switch had a reset button. It was a quick easy fix. Thanks for the help. (IMG:style_emoticons/default/driving.gif)
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| Eric_Shea |
Jul 15 2013, 06:59 AM
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#7
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PMB Performance Group: Admin Posts: 19,304 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
That would do it. Any time you lose pressure in the system that trips. Good to know it's working properly.
Thanks Dave... don't know why I spaced on that one. But what about the fuse? |
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| flipb |
Nov 10 2014, 10:42 AM
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#8
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Senior Member Group: Members Posts: 1,807 Joined: 2-September 09 From: Fairfax, VA Member No.: 10,752 Region Association: MidAtlantic Region
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I've had the dreaded flashing brake warning light for months now. I finally got under the car, reset the switch on the MC, removed/reattached the lead on the MC, and I still have the flashing brake warning.
I've confirmed that the parking brake is properly aligned to press the button when the brake is released. So now I'm wondering if either the MC sensor or the parking brake switch is malfunctioning. Is there any way to isolate one or the other so I can figure out what's causing the flashing brake warning? |
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