rolling backwards braking oddity...04 9-3

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Tex - 27 Aug 2005 13:49 GMT

I have a 2004 9-3 Aero. I've noticed an odd behaviour. It seems to only
happen when rolling backwards down an incline. When applying the brakes
during the roll, the car will jerk awkwardly (albeit intermittently).

I thankfully don't do this often, but I have had to do it under certain
circumstances and it's very bizarre. Anyone else experience this? I can
imagine someone experiencing this who parks regularly on a hill or has an
inclined driveway.

- tex

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Charles C. - 28 Aug 2005 00:36 GMT

> I have a 2004 9-3 Aero. I've noticed an odd behaviour. It seems to only
> happen when rolling backwards down an incline. When applying the brakes
[quoted text clipped - 6 lines]
>
> - tex

Hi,

As a complete guess, the brake pads are not evenly worn (say a bit more
worn at the top of the pad than the bottom of the pad and/or the pads
have a bit of play in the calipers and when the move into position
(whilst reversing) they grip suddenly.

Common problems with C900s which had those :-) brakes.

Unless the problem goes away by replacing the pads with new (fuller)
pads I would check it out further.

Regards
Charles

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ma_twain - 31 Aug 2005 00:52 GMT

>> I have a 2004 9-3 Aero. I've noticed an odd behaviour. It seems to
>> only happen when rolling backwards down an incline. When applying the
[quoted text clipped - 16 lines]
>
> Common problems with C900s which had those :-) brakes.

Which brakes on the C900 are you referring to? I have drive C900s models
from 1985(parking brake on front wheel) to 1993 and I have not
experienced this braking situation. This includes non-ABS and ABS brake
systems.

> Unless the problem goes away by replacing the pads with new (fuller)
> pads I would check it out further.
>
> Regards
> Charles

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Paul Halliday - 31 Aug 2005 08:41 GMT

>>> I have a 2004 9-3 Aero. I've noticed an odd behaviour. It seems to
>>> only happen when rolling backwards down an incline. When applying the
[quoted text clipped - 5 lines]
>>> this? I can imagine someone experiencing this who parks regularly on
>>> a hill or has an inclined driveway.

>> As a complete guess, the brake pads are not evenly worn (say a bit more
>> worn at the top of the pad than the bottom of the pad and/or the pads
[quoted text clipped - 7 lines]
> experienced this braking situation. This includes non-ABS and ABS brake
> systems.

Those rear Girlings? I've had a little shudder on the rear wheels when just
rolling backwards ... I didn't put "two and two together" when Tex asked
about his problem. In my case it turned out to be the inner pad on the LHS
was totally worn.

Paul

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Jim M - 28 Aug 2005 23:43 GMT

>I have a 2004 9-3 Aero. I've noticed an odd behaviour. It seems to only
>happen when rolling backwards down an incline. When applying the brakes
[quoted text clipped - 6 lines]
>
> - tex

My 1995 900S has done this since new, and it definitely feels as if it's
tied in to the ABS system. The only time I notice it is when backing down a
fairly steep incline at a friend's house while keeping steady pressure on
the brakes to slow the vehicle. I can also state the the car is in neutral
(5-speed stick) while this occurring, as this hill is sufficently steep that
there is no real need to engage reverse. It feels as if the brakes release
momentarily and then reapply. I've always felt that it could be considered a
safety issue and I figured that sooner or later a service bulletin or recall
would result. Anyone else experience this?

Jim

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