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Omega Help Area => Omega General Help => Topic started by: Lizzie_Zoom on 16 June 2009, 19:32:12

Title: Front Brake Sensors Mystery
Post by: Lizzie_Zoom on 16 June 2009, 19:32:12
Today I went to replace my front brake discs and pads as some weeks ago the "Brake Pad" warning appeared on the MID.

Anyway removed the brake caliper on the near side, then the off side only to find that the brake pads are about 4/5ths of the new thickness and the discs are excellent.  In some ways not surprised as the car sailed through the MOT just two months ago.

But what baffles me now is why the MID warning showed due to what I also found to my disgust! >:( >:( >:(

This car was meant to have been Vx dealer serviced before I bought it, but on both sides of the car the brake sensor cables, with the remains of the sensors, were taped up in insulation tape :o :o  Therefore NO sensors were connected!! :o :o :o

New sensors are going to be fitted another day, but why would the MID suddenly show its warning message when the sensors had always been disconected during my ownership?? :-/ :-/ :-/ :-/

Any advise please? ;) ;)
Title: Re: Front Brake Sensors Mystery
Post by: Andy B on 16 June 2009, 19:36:55
The bare ends of each sensor must've been connected together for the MID to have been happy - the message comes on when the sensor circuit goes open circuit (not in a loop). Perhaps if they had been taped up, something has caught one side or other and pulled the wires so that it un-connected the wires or maybe they've been caught by the disc which has worn through the wires.  :-/
Title: Re: Front Brake Sensors Mystery
Post by: cem_devecioglu on 16 June 2009, 19:40:03
new sensors :) :y

and be careful when inserting them , they can break easily :-/
Title: Re: Front Brake Sensors Mystery
Post by: Lizzie_Zoom on 16 June 2009, 20:06:15
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The bare ends of each sensor must've been connected together for the MID to have been happy - the message comes on when the sensor circuit goes open circuit (not in a loop). Perhaps if they had been taped up, something has caught one side or other and pulled the wires so that it un-connected the wires or maybe they've been caught by the disc which has worn through the wires.  :-/

Oh no Andy, these wires were fully taped with insulation tape and clipped out of the way using cable ties!! ::) ::) ::)  Someone had deliberately rendered them "harmless"! :o :o ;) ;) 


Title: Re: Front Brake Sensors Mystery
Post by: Lizzie_Zoom on 16 June 2009, 20:07:44
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new sensors :) :y

and be careful when inserting them , they can break easily :-/

I know Cem, tell me about it! ::) ::)  I have already broken two of the buggers :'( :'( :'( :'( :-[ :-[ 
Title: Re: Front Brake Sensors Mystery
Post by: Andy B on 16 June 2009, 20:16:59
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The bare ends of each sensor must've been connected together for the MID to have been happy - the message comes on when the sensor circuit goes open circuit (not in a loop). Perhaps if they had been taped up, something has caught one side or other and pulled the wires so that it un-connected the wires or maybe they've been caught by the disc which has worn through the wires.  :-/

Oh no Andy, these wires were fully taped with insulation tape and clipped out of the way using cable ties!! ::) ::) ::)  Someone had deliberately rendered them "harmless"! :o :o ;) ;) 



I'd short out the loom side then to make sure your message goes out before I fitted the new sensors.  :y
Title: Re: Front Brake Sensors Mystery
Post by: Lizzie_Zoom on 16 June 2009, 22:02:10
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The bare ends of each sensor must've been connected together for the MID to have been happy - the message comes on when the sensor circuit goes open circuit (not in a loop). Perhaps if they had been taped up, something has caught one side or other and pulled the wires so that it un-connected the wires or maybe they've been caught by the disc which has worn through the wires.  :-/

Oh no Andy, these wires were fully taped with insulation tape and clipped out of the way using cable ties!! ::) ::) ::)  Someone had deliberately rendered them "harmless"! :o :o ;) ;) 



I'd short out the loom side then to make sure your message goes out before I fitted the new sensors.  :y


Thanks Andy, but how do you do that, and safely? :-/
Title: Re: Front Brake Sensors Mystery
Post by: KillerWatt on 16 June 2009, 22:10:48
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new sensors :) :y

and be careful when inserting them , they can break easily :-/

I know Cem, tell me about it! ::) ::)  I have already broken two of the buggers :'( :'( :'( :'( :-[ :-[ 
Thats why you push both sides of the spring down first ;)



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I'd short out the loom side then to make sure your message goes out before I fitted the new sensors.  :y


Thanks Andy, but how do you do that, and safely? :-/
Insert the fabled paperclip in to the socket where the sensor plugs in to.
Title: Re: Front Brake Sensors Mystery
Post by: Andy B on 16 June 2009, 22:12:45
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Thanks Andy, but how do you do that, and safely? :-/

Unplug the plug & socket of the brake wear sensor, and on the socket attached to the loom in the wheel arch are two 'holes' of the socket. Just bridge them with a paper clip or short piece of wire and then see what your dispaly has to say .... it shouldn't be anything!  ;D  ;D  You won't get a shock or anything.
I won't leave the plug & socket seperated though, you'll get water/sh1te in & around the plug & socket.
Title: Re: Front Brake Sensors Mystery
Post by: Lizzie_Zoom on 16 June 2009, 22:15:05
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new sensors :) :y

and be careful when inserting them , they can break easily :-/

I know Cem, tell me about it! ::) ::)  I have already broken two of the buggers :'( :'( :'( :'( :-[ :-[ 
Thats why you push both sides of the spring down first ;)



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I'd short out the loom side then to make sure your message goes out before I fitted the new sensors.  :y


Thanks Andy, but how do you do that, and safely? :-/
Insert the fabled paperclip in to the socket where the sensor plugs in to.


Right!  Thanks for that KillerWatt :y :y :y

As for "pushing the springs down", are they not already when the pads and caliper is all in place and you are connecting the sensor to the top of one pad through the apeture? :-/ :-/
Title: Re: Front Brake Sensors Mystery
Post by: Andy B on 16 June 2009, 22:18:09
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As for "pushing the springs down", are they not already when the pads and caliper is all in place and you are connecting the sensor to the top of one pad through the apeture? :-/ :-/

I'm glad he confuddled you too!  :-?
You're quite right Lizzy, the sensor is the last thing to go on (the inboard) pad once your caliper is built up again with your new pads.  :y  :y  :y
Title: Re: Front Brake Sensors Mystery
Post by: Lizzie_Zoom on 16 June 2009, 22:20:28
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As for "pushing the springs down", are they not already when the pads and caliper is all in place and you are connecting the sensor to the top of one pad through the apeture? :-/ :-/

I'm glad he confuddled you too!  :-?
You're quite right Lizzy, the sensor is the last thing to go on (the inboard) pad once your caliper is built up again with your new pads.  :y  :y  :y


Thanks Andy, as yes I was a little puzzled by that one! ;)  I still managed to break the bloody things (x2) when I tried to push them into the inside hole of the brake pad, so £17 down the shoot! :'( :'( :'(
Title: Re: Front Brake Sensors Mystery
Post by: KillerWatt on 16 June 2009, 22:21:17
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As for "pushing the springs down", are they not already when the pads and caliper is all in place and you are connecting the sensor to the top of one pad through the apeture? :-/ :-/
They are nowhere near enough compressed when the pad is sitting in the caliper Lizzie. If they were, then the sensor would fall out.

PS

Sensors at CAF....£9 inc VAT for the PAIR.
Title: Re: Front Brake Sensors Mystery
Post by: TheBoy on 16 June 2009, 22:25:35
rather than paperclips in the socket, a better job would be to modify an old sensor, shortening the wire to and inch or so, and shorting the wires, then popping on a bit of heat shrink...
Title: Re: Front Brake Sensors Mystery
Post by: Lizzie_Zoom on 16 June 2009, 22:26:29
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As for "pushing the springs down", are they not already when the pads and caliper is all in place and you are connecting the sensor to the top of one pad through the apeture? :-/ :-/
They are nowhere near enough compressed when the pad is sitting in the caliper Lizzie. If they were, then the sensor would fall out.

Thanks KillerWatt, but the pin of the sensor does have a cir clip to hold them in, and if you try and fit them prior to sealing the calliper when you go to push the calliper in place on top of the pads in situ, the 'pre fitted bend of the sensor wire gets in the way :o :o  That's what I have found anyway, and in fact I tried both methods and still ended up breaking the damn things! :'( :'(
Title: Re: Front Brake Sensors Mystery
Post by: Andy B on 16 June 2009, 22:27:01
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They are nowhere near enough compressed when the pad is sitting in the caliper Lizzie. If they were, then the sensor would fall out.

PS

Sensors at CAF....£9 inc VAT for the PAIR.

The wear sensor will clip into the anti-rattle spring of the pad whether it's fitted into the caliper or sitting on your bench/floor/hand/other. My wear sensors hadn't worn through when I changed my discs & pads this week end, but i still had to use a pin punch to remove the seanors from the pads.  :-/  :-/  :-/
Title: Re: Front Brake Sensors Mystery
Post by: Andy B on 16 June 2009, 22:28:27
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rather than paperclips in the socket, a better job would be to modify an old sensor, shortening the wire to and inch or so, and shorting the wires, then popping on a bit of heat shrink...

I was intending it purely as a test of the rest of the check system, not to be used on the road.
Title: Re: Front Brake Sensors Mystery
Post by: Lizzie_Zoom on 16 June 2009, 22:29:18
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rather than paperclips in the socket, a better job would be to modify an old sensor, shortening the wire to and inch or so, and shorting the wires, then popping on a bit of heat shrink...


Thanks TB, that sounds like a good idea! :y :y

I've got plenty of old sensors with wire after all ::) ::) ;D ;D ;)
Title: Re: Front Brake Sensors Mystery
Post by: TheBoy on 16 June 2009, 22:30:27
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rather than paperclips in the socket, a better job would be to modify an old sensor, shortening the wire to and inch or so, and shorting the wires, then popping on a bit of heat shrink...

I was intending it purely as a test of the rest of the check system, not to be used on the road.
I always keep some premade shorted out plugs - handy if you have to pop the pads out for any reason (like for me to try to file off the glazed bits ::)), and the sensor breaks...
Title: Re: Front Brake Sensors Mystery
Post by: albitz on 16 June 2009, 22:36:00
I think the sensors are more trouble than they are worth,I binned mine the first time I changed the pads.Bridged the connector terminals,job done.Im perfectly capable of keeping an eye on them without the car telling me they need changing. :)
Title: Re: Front Brake Sensors Mystery
Post by: KillerWatt on 16 June 2009, 22:36:16
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My wear sensors hadn't worn through when I changed my discs & pads this week end, but i still had to use a pin punch to remove the seanors from the pads.  :-/  :-/  :-/
Next time you pull it apart and want the sensors out, just push both ends of the spring down as far as they will go....the sensor will practically fall out.