Retroanaconda Posted April 27, 2013 Share Posted April 27, 2013 My 90, like most other 90s with rear disc brakes, uses the same fitment of rear caliper/pad/disc setup as later Discovery 1 vehicles (though I believe Discos had dual-line hydraulics). The part number for the brake pads that fit this common system is STC9188. Discovery 1 vehicles were also offered with brake wear sensors, using pads STC9189. Since the only difference on these pads is that they have the wear sensors I should be able to fit them into the calipers on the back of my 90. Do these sensors work in as simple a way as I seem to understand? The wires terminate in the friction material at a certain depth and when said material wears down sufficiently the contact with the steel brake disc just shorts the two together? If my belief as above is correct then I'll be putting a set in the 90 and seeing if I can wire up a warning light on the dash, as my rear pads suffer wear a lot faster than the front. Quote Link to comment Share on other sites More sharing options...
western Posted April 27, 2013 Share Posted April 27, 2013 because the pads have sensors built in to the friction material, so it's to reflect this difference in parts, simple as that. not much point fitting these if your vehicle doesn't have the associated wiring in the rest of the wiring looms, AFAIK no pre Tdci maybe Td5 defender/90/110 had pad wear sensor wiring. IIRC when worn to the contacts the pads earth on the disc & dash warning light goes on until the pads are replaced. if your going to wire the system you may as well do the fronts too. Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted April 27, 2013 Author Share Posted April 27, 2013 I know that Ralph. I was asking how they work. ie. Is it literally as simple as the disc shorts the wires together when it wears down? Or perhaps does it break a connection between them instead? Obviously my car has no wiring installed for the sensors, I was going to fit my own and wire it to the redundant ABS warning light on the dash. Quote Link to comment Share on other sites More sharing options...
western Posted April 27, 2013 Share Posted April 27, 2013 Yes that simple. the disc just completes the circuit be it a earth or a contact between both pad contacts [2 in each pad AFAIK] Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted April 27, 2013 Author Share Posted April 27, 2013 Excellent. Another mini-project to add to the list then Quote Link to comment Share on other sites More sharing options...
landroversforever Posted April 27, 2013 Share Posted April 27, 2013 Excellent. Another mini-project to add to the list then I might do that at some point then too, as my rear axle is I believe an early Disco axle Quote Link to comment Share on other sites More sharing options...
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