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antilock/wooden brakes

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Old 09-10-2005, 05:32 PM
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Rich9928p
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Originally Posted by the flyin' scotsman
Rich...........is there a schematic for the relay so that I can do some testing? I did remove it during the week, cleaned the relay contacts ( they weren't really dirty) and cleaned the respective holes on the fuse panel. I also checked the connection points that Ernest mentioned under the hood.

Its pouring with rain here so I'll do an oil change and pull the front wheels.

To reiterate, there's no warning on start up, only after the car has been driven for a considerable distance does the light come on.......apprx 100kms.
The relay is a mechanical contact point switch. Over time, the points get carbon build-ups. They can be intermittent and are a "wear" item. I suggest replacing the relay. Several of my module LH rebuid customers contacted me when their ABS light came an and the relay replacement fixed the problem.

Other items, disconnect every connection point, clean the contacts, and plug them back together.

It is much more labour, and a lower possibility, but the wheel speed sensors could be covered with metalic crud and/or the tuner rings filled up too. Cleaning these items can clear up problems too.

Attahced are a few pages from Porsche's 1985 Service Docs.
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Old 09-10-2005, 07:34 PM
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the flyin' scotsman
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Thanks Rich..........I don't have an oscilliscope at home and I wont be able to get a relay until back in the city next week. I am a EE so will go at it with gusto this aft and post the results.
I have several service docs but not the '85 so much appreciate the schematic and notes...........going in.



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