This is on a 2016 Land Rover LR4 HSE, but it is pretty much the same for most vehicles with brake pad wear sensor cables. This is how it basically works.SUBS
Everything you need to know about brake pad wear sensors - Garage Wire
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Disc Brake Pad Wear Sensor Connector - Advance Auto Parts
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audipages Front Brake Pad Warning Light Troubleshooting
Brake pad wear sensor