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Discussion Starter · #1 ·
All,

Your advice'help needed please:

I have yesterday collected my 1989 9000 CD Turbo Salloon after having some quite major work done on the brakes. I have had a new calliper fitted to the front n/s, new discs & pads to the front & some adjustment work completed on the rear offside to clear a problem with the handbrake. (It wasn't very effective).

Since buying the car in August of last year I have noticed that if pulling away "roughly" from a standing start the ABS warning light comes on for a few seconds & then extinguishes. If I pull away roughly enough the warning light comes on & stays on until I cycle the ignition. On the odd occasion the ABS has been noticed without any skidding waht-so-ever with no warning light being shown.

The work caried out yesterday has improved my brakes no end though I obviously want the brakes to "bed in" fully before I use them to their full stopping ability. The handbrake is MUCH more effective however I know that the work done has done nothing to change the ABS warning light being shown when I pull away with any kind of gutso.

My question then...

I fully appreciate that certain componenebts will have not been touched yesterday. (ECU, Fuses, Relays etc etc). Does anyone have any ideas as to where my problems might lie or is this normal on the 9000 Turbo? If I have a problem, am I best to meddle myself or should the car really be investigated by me taking a very large tub of vasseline to my local Saab dealer & promptly beniding over for a good old shafting?

Do you need to know moire to make a qualified analysis of my dilemma?

Your thoughts/advice on this will be greatly appreciated.

With thanks.
 

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The ABS sensors on the wheels are subject to a rough time, and tend to be the most vulnerable aspect of the ABS system (According to a Saab Technician).

Maybe the hard accelleration is causing a connector to pull apart, or other bad contact to happen. Clean and check the sensor and wiring around both front wheels, and then the rears. Quite easy with the wheels off, or if you have a rubber neck
 

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Your fault is what is called a moving fault,ie ecu not getting a signal from sensors as paul d recomends check sensors, wiring to sesors and check if dirty bit awkard to get to unless you remove them from hub,but if they have been in for a while you could open can of worms trying to take them out, so best to try and clean them in situ with brake cleaner,you could try checking resistance values of sensors with a mulitimeter (you car does not have self diagnostics through the code reader), but bear in mind this problem you have is common,when you take off very quickly the air gap between sensor and ring could increase resulting in a poor signal to ecu this is usually caused by movement of the wheel bearing under extream stress sutch as as taking off quick,epecially if the bearing has big milage,if light keeps going off maybe its worth putting up with it a while,if you have to take it to a dealer or specialist it could cost,

AYM
 

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If wheel bearing is worn, most likely to be front kerb side, as this is the one that tends to get the most bumps on kerbs, potholes, etc.

To check, jack up front wheel and hold front/back and wobble to check for play in bearing, and then top/bottom and repeat. Also, when the wheel is spun you should hear a grumbling noise from the bearing, depending on how bad it is worn.

Saab wheel bearings are extremely robust, but can go at 100+ miles depending on how hard they have been treated, etc.
 

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Discussion Starter · #8 ·
Thanks all for your comments. The car has done over 188k miles so it could well be that the wheel bearings, track-rod ends or ball joints are worn. I will check this over the next weekend. (Can't do this weekend as I'm at a party down in Bournemouth).

Hopefully you're right about something as simple as this & for all the wrong reasons I guess it's good to know that I'm not alone in experiencing this. If the problem is still apparent after checking/doing the above then I can always get Saab involved to at least identify & cost the repair. Then I can laugh to myself all the way home at the rediculous prices they pluck out of the air.

Thanks again for your help people.
 
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