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Brake Pad Wear Warning Light

4647 Views 7 Replies 6 Participants Last post by  DangerMouse67, 
K
Are all 15 warning lights supposed to illuminate on the instrument binnacle when the key is turned to position I? All of my lights turn on except for one, the brake pad wear warning light (First Column Second from Top). I know the light works because I can jump the two pins on the harness at the brakes to get the light to come on. However, it does not illuminate during the initial startup.

If it is supposed to light up does anyone have any ideas as to what could be the problem? Possibly the bulb check unit?

Thanks
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rtkraken
Check wiring to the brake pads first. Very common for folk to cut these so they aren't bothered by the dash lamp. The wiring schematics show that the pad wear warning lamp should illuminate by either shorting at a worn pad or activation by the warning lamp control unit. It looks like if you were to cut the wires at the brake pads it may also effect continuity to the control unit. Schematics leave something to be desired...
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K
I know for a fact all the wiring is fine because I can short the harness at both front/rear pads and get the light to illuminate. Any other suggestions?

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D
If you know it will illuminate when it needs to, why worry?
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D
I am glad this post brought something to my attention.... my '88 3.5 does not seem to do a bulb check when the key is turned to first position?
Is it supposed to?
If so, where do i start looking for faults?

cheers,
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A
There are break pad warning lights!? Great I won't keep bugging my service guy to check the pads at every rotation. Yeah, right.
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DangerMouse67 said:
I am glad this post brought something to my attention.... my '88 3.5 does not seem to do a bulb check when the key is turned to first position?
Is it supposed to?
If so, where do i start looking for faults?
cheers,
Click to expand...
Only US versions do this. They have a "Warning Lamp Control Unit" behind the dash panel under the steering column. Had to look this up in the workshop manual I have. I have made a pdf of the page

http://apache.dataloss.nl/~ian/WarningLampControlUnit.pdf

Apparently the brake light is supposed to be on during the test.
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Cheers for that rqsall.
Seems the uk spec is a bit behind the times then. Both my late 80s Mercs do a bulb check.
Oh well, one less thing to go wrong i guess .

thanks again.
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