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EL Falcon - ABS activating at 5km/h and under 

 

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 Post subject: EL Falcon - ABS activating at 5km/h and under
Posted: Sat Feb 04, 2006 5:42 pm 
Getting Side Ways
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Have another problem with the taxi - ABS kicks in and starts hammering the pedal as I'm coming to a stop, completely at random, at around 5km/h and under.

It happens on the straights, up & down hill, forward and reverse, going left or right.

Happens a couple of times a day. Can't say its getting worse, it only started doing it a week ago and now I'm getting annoyed with it. Car still stops ok but you hear the ABS motor spin up and the pedal is pulsating.

I'm thinking a dodgy wheel sensor or wiring but do the Ford ABS units have a diagnostic mode I can check?

The ABS light isn't showing any faults and ABS works as per normal every time in the wet and dry.

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Posted: Sat Feb 04, 2006 6:08 pm 
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check all ur hubs and make sure theres no s**t dirt / metal filings etc in your sensing ring and clean up the 'pickups' as well,

These are magnetic pulsators and detect a stationary wheel,
It may help (lets hope) but then again it may not. but worth a check

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Posted: Sat Feb 04, 2006 7:50 pm 
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speedo working ok?

 

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Posted: Sat Feb 04, 2006 8:22 pm 
Getting Side Ways
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Yep speedo is fine

I'm betting it's gonna be the filings, I saw them when I reshimmed & machined the LSD so i'll give it a go blowing them out tomorrow.. For some stupid reason it didn't even cross my mind they could be the problem...

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 Post subject: Re: EL Falcon - ABS activating at 5km/h and under
Posted: Sun Feb 05, 2006 5:38 pm 
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Bozz wrote:
but you hear the ABS motor spin up and the pedal is pulsating.I'm thinking a dodgy wheel sensor or wiring but do the Ford ABS units have a diagnostic mode I can check?The ABS light isn't showing any faults and ABS works as per normal every time in the wet and dry.
I didn't think you could hear the ABS modulator.
There is the ABS diagnostic in the doco's section - see if you get any codes, then clear them - they may be old.
I'd suggest you confirm the ABS is the problem and not the brakes themselves - your rotors may be getting a slight warp (as you know pulsation should be always, but maybe not). You can pull the ALB fusible link - it only powers ABS and nothing else. The ABS light will stay on. Brakes will then operate like a non ABS car. Run the car for a few days like this and see if the problem disappears or not.

 

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Posted: Sun Feb 05, 2006 9:25 pm 
Getting Side Ways
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snap0964

It certainly is the ABS, I regularly test it and have known the difference between ABS pulsing and rotor shudder for a very long time....

You certainly hear ABS if its operating in my car without much deceleration. Try it on grass at 20km/h, or just after rain falls following a long dry spell on the road from a slowish speed.

Well I cleaned the rear sensor rings which did have a small amount of metal filings on them, hasn't done it today but we'll see how it goes over the next week.

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Posted: Sun Feb 05, 2006 9:35 pm 
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Yeah, fair enough.

I'd say you'll find plenty of metal filings on the front sensors as well. Probably may be plenty crap on the front tone wheels as well . . . .

I know my fronts were scraping the sensors, causing some pulsing, I had to seat the tone wheels on the discs as they weren't done properly in the first place, pulsing cleared after that.

 

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