Parking brake sensor location - Defender Source
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  #1  
Old January 31st, 2013, 11:40 AM
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Parking brake sensor location

Anyone know where the sensor is that when the parking brake is pulled triggers the dash warning lamp? I had a quick look but did not notice it. I have not looked in the books yet, if I ground direct to that post behind the warning lamps it will come on but not when the lever is pulled.
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  #2  
Old January 31st, 2013, 11:51 AM
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pull the boot of the parking brake handle.
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Old January 31st, 2013, 01:57 PM
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I had the boot off and figured that was the logical spot it would be so guess I do not have one then and no evidence it was ever there.
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  #4  
Old January 31st, 2013, 06:19 PM
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The wire comes from the underside of the seat box. With a flashlight you should be able to see if it is there but not connected. The wire is connected to a small black switch, as mentioned, on the brake handle base.
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Old January 31st, 2013, 09:56 PM
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I just did this on mine. There were two screws holding the switch/sensor onto the parking brake handle. I removed the switch/sensor housing, and pulled the plunger out (watch out there's a spring in back of it). There's a small brass piece recessed in the plunger that makes "contact" when you pull the brake handle (closes the circuit). Mine had recessed too much so I had to pull it out a little. Dielectric grease, reassembled, and I've got the light again!
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  #6  
Old May 28th, 2013, 06:19 PM
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Reviving a thread only in reverse...my brake light will not go out. I pulled the wire from the sensor under the brake lever boot and put it to ground and the light stayed on. I also checked the brake fluid reservoir and the wires are connected and fluid is within the allowable range. Any thoughts? Gotta get an inspection this month and don't want to fail for something stupid like this!
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Old May 28th, 2013, 06:38 PM
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How does the switch work? I assume it just completes a ground circuit, right?
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Old May 28th, 2013, 06:43 PM
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Mine does this unless the master is all the way to the full line. I am not really sure why.
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Old May 28th, 2013, 06:59 PM
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I will try topping the fluid up to the top line...I typically leave it down a little for off camber driving
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Old May 29th, 2013, 11:56 PM
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I'm having the same issue and will troubleshoot the switch this weekend.

Thought about also going the fluid top off route as its acceptable but not at high mark. These take DOT 4 correct? My local advance only sells a DOT 3/4 synthetic. Is that a problem or find DOT 4. Sorry for hijack
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Old May 30th, 2013, 12:14 AM
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I normally run Castrol GTLMA in my rig
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Old May 30th, 2013, 12:25 AM
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Ditto on the GTLMA--I get mine at Pep Boys. Ditto on my resevoir having to be relatively full or sensor going off, too...
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Old May 30th, 2013, 12:34 AM
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My local Pep Boys stopped carrying it but have had luck finding it at Olympus or Fairfax Auto (Napa) but only in pints
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Old May 30th, 2013, 06:14 AM
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Pull the bulb out from behind the dash to pass inspection in the meantime.
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Old May 30th, 2013, 04:01 PM
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technically they are supposed to check and if your light doesn't come on when you pull the handle then you should fail for that as well
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Old June 3rd, 2013, 08:42 PM
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To close the loop and for those keeping score, i checked sensor and it looked great. I bought DOT 4 from NAPA filled to max, fitted cap and its been 2 days with no light. Seems the fill up was what mine required.
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Old June 3rd, 2013, 08:58 PM
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Quote:
Originally Posted by SimpleJack View Post
To close the loop and for those keeping score, i checked sensor and it looked great. I bought DOT 4 from NAPA filled to max, fitted cap and its been 2 days with no light. Seems the fill up was what mine required.
Do you wheel your truck at all? If so, that may explain the reservoir being down (as it sloshes around and sometimes comes out the vent hole). Other explanation could be as your brake pads wear the pistons get pushed further out and hence the fluid level drops.

Or, other possibilities are leaks in the system...the bottom oring on the master cylinder reservoir sometimes weeps. Either way of keep an eye on it to make sure it's not leaking out somewhere.
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