ABS FAULT ?? PULL FUSE ??
11-02-2008, 11:54 AM
#17
Three Wheelin'
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Join Date: Jun 2005
Location: Bournemouth, Dorset, UK.
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Hi 
It rained heavily and now it all seems to be working again lol...
Thats got to indicate its an electrical fault at a sensor..I think....
I am awaiting some new belly pans and converter from Roger (928Rus) , also will be fitting a wideband/gauge, so will strip all the wheels and sensors down while I have it in the air....
All the best Brett
It rained heavily and now it all seems to be working again lol...
Thats got to indicate its an electrical fault at a sensor..I think....
I am awaiting some new belly pans and converter from Roger (928Rus) , also will be fitting a wideband/gauge, so will strip all the wheels and sensors down while I have it in the air....
All the best Brett
11-02-2008, 12:15 PM
#18
Electron Wrangler
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On a car with ABS, the best way to disable it is to unplug the wheel speed sensors. That will immediately fault the system (at least a newer system). For the 928 I'm not so sure since it's modulations is 3 generations old, but on newer stuff with two sensors pulled you still get electronic brake force distribution, EBD. That drops pressure in the rear circuit. If you just pull the fuse on an ABS car you will have too much rear pressure. In effect it's the same as totally removing the prop valve on an older car. The hydraulic unit runs higher brake pressure than normal at light applies, and then limits rear pressure builds as total circuit pressure goes up. Pulling the fuse removes that functionality.
It does have various failsafes - but the biggest concern seems to hane been that it would operate when it should not and reduce brake circuit pressure when that would be dangerous... obviously a major liability issue for the manufacturer (Bosch) and a black mark against ABS in general.
Alan
11-02-2008, 12:31 PM
#19
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With the ABS repaired, the 33 bar bias, new rear rotors and pads the car now brakes very hard with little nose dive. PBR ceramic pads all round.
