Date: Wed, 04 Oct 2000 18:09:39 -0400 From: Rob Levandowski <roblnopsamhiz.com> Subject: Re: Saab Anti Lock Brakes - A Question.
In article <4jqmtsktoav1eo828vahrqc5afvdeh1s3qnopsamcom>, Jay <jaynopsamaala.demon.co.uk> wrote: >Hi, > > I've got a 1994 Saab900SE Coupe (2.5 - V6). > > I've had the car for a few weeks , and now I've been getting >more used to it I've been giving it a bit of welly for a few days. >Anyway, when I have to brake hard enough to use the abs, I get a >horrible grinding noise through the body of the car and I can feel the >brake pedal vibrating along with the noise. I know the brake pedal >should 'pump' as the abs works, but the noise is so horrible I'm >convinced that it's not right. > The car is the General Motors version of the 900, which has a >Bosch ABS system (so I'm told). The seller assures me that this noise >is normal, and I'm certain he's not bothered getting them checked to >save himself some grief. I've never had a car with ABS before, so I'm >not certain, but I've never heard anyone elses car make this noise >when they brake, and a few have told me that they can feel the ABS >kicking in when they've had to brake hard. > I don't really want to have to fork out for a brakes test, but >I need to know if this really is normal. > > Can anyone shed any light on this ??? This is not unusual with anti-lock brakes of that vintage. I've owned cars where the ABS system sounded as if it were tearing the car apart from the inside, and any serious use would leave your leg numb from the vibration. The system on my 1999 9-5 SE V6 is a lot tamer. I think this aspect of ABS is what leads a lot of people to misuse it -- the number one reason why people don't see improved braking with ABS is because they tend to use too little brake pressure. Perhaps the sound and noise sends too much of a "broken parts" signal to the driver. In any case, with ABS, the right way to handle an emergency stop is to push the brake as hard as you can, and keep it there, while you steer to avoid the obstacle if possible. The noise and vibration are your signal that the ABS is doing its job... -- Rob Levandowski roblnopsamhiz.com (Opinions expressed are solely my own and not a statement from my employer)
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