Where do I connect rear pad sensors?

V

V8P6B

Member
I have a 1971 S2 P6 3500, with the wiring points at the front for the pad sensors, but at the back of the car, I can't see where to connect the wires for the pad sensors. I bought a set of NOS rear pads at beaulieu autojumble last year, with the wear sensor wires, but my car doesn't seem to have anywhere to connect them. Am I missing something here? Are there any wiring points, or are the pads wrong. It is an early S2 car, with the fuse box up on the inner wing. The pads that were removed from the rear calipers didn't have the wiring. The only spare electrical connection under the rear of the car appears to be a double bullet type connector that comes through the boot floor with the fuel tank sender wires. Is this it? Or do P6's not have rear sensor wires? :?:
P.S. Wasn't sure whether to post this in brakes or electrical section..
 
They come out of the rear crossmember - the one the diff hanger bolts into, and face forward.

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Richard
 
Doh! Should have looked a bit more closely! Found them in exactly the place you described. Thanks for the incredibly swift reply! I suspect I may be replacing the warning bulb in the dash now, as the pads I took out at the back weren't the wired type! (Previous owner.. :roll: ) 8)
 
V8P6B said:
I suspect I may be replacing the warning bulb in the dash now, as the pads I took out at the back weren't the wired type! (Previous owner.. :roll: ) 8)
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The warning light won't work if the plug from the pad isn't fitted, so fit the pads with the wires correctly, and with luck the brake warning light will start working.
 
harveyp6 said:
V8P6B said:
I suspect I may be replacing the warning bulb in the dash now, as the pads I took out at the back weren't the wired type! (Previous owner.. :roll: ) 8)
Click to expand...

The warning light won't work if the plug from the pad isn't fitted, so fit the pads with the wires correctly, and with luck the brake warning light will start working.
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Thanks, I must have got my logic the wrong way round. I assumed the warning lamp worked when the wire went open circuit, so if the pad wasn't connected, the wires would be open circuit, causing a permanent warning lamp lit. I hadn't realised the way it works must be that the wires in the pad had the circuit completed by the brake disc when they wore down far enough to reach them. I (incorrectly) assumed that the circuit was made until the sense wire was worn away by the brake disc, making it go open circuit. Thanks for pointing that out, I'll have to wait and see what happens, the diff's on the bench at the moment..
 
The wire from each pad goes to each of the terminals on the loom connection, so the feed runs through all four sensor connections in series, earthing through the handbrake switch to test the circuit. Once the pad wears down enough to earth out the sensor wire it puts the light on regardless of whether the handbrake is on or not. Add the reservoir low fluid switch, and the common earth for the starter relay, and you have a very clever and efficient system, providing it's all wired up right.
 
Cheers for that. It all makes sense now. For its time, it was way up there I guess. I remember thinking a similar setup on my 1980s MK3 escort was clever at the time, but this was a decade earlier! Just hope it all works now... :D
 
The Rovering Member said:
V8P6B said:
For its time, it was way up there I guess. I remember thinking a similar setup on my 1980s MK3 escort was clever at the time,
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Oh dear me, no! :LOL:
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Sorry.. :oops: I was a skint stoodent then... It didn't take me long to realise the error of my ways though... Only had that car a few months, then moved on to a MK1 Granada Coupe (which I wish I still had).. Hope that cancels it out a bit... :LOL:

Here's a pic..
Granny800x600.jpg
 
When I was a student (Long time ago), I have a 3.0 GXL Granada saloon. Loved it to bits but I would sooo much love a coupe.

and an FD VX4/90 - Hmmmm coke bottle 8)

Richard
 
Those were the days when you could get pretty good cars quite cheap. I paid £400 for that MK1 Coupe.. Did get it resprayed though, handy when your Dad runs his own paint spraying business.. I reckon you'd probably spend £400 on a decent pair of Coupe doors nowadays, if not more. I drove that MK1 Coupe for 5 years, driving daily from Stroud in Gloucestershire to Heathrow and back 5 days a week. That was when I got my 1st job after college. I'm still in that job now, 20 years later.. I sold that car in 1994, after it was laid up one winter. Fuel prices had started to get silly, and I couldn't afford to run it nearly 1000 miles a week any more. Kicking myself that I ever sold it now, especially when I pretty much gave it away to a so-say MK1 Granada "specialist". I have a nasty feeling he was actually a banger racer. :evil: Still, there's no point being sentimental about it I suppose. :(
 
I paid £100 for mine then it fell to bits over the next two years, and I scrapped it for £75.00

:D

£12.50 per year depreciation - those were the days

Richard
 
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