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Old 08-23-2005, 14:01   #1 (permalink)
Paul Harrison
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S Type Brake failure

I have a 2003 S Type and had some problems that have been fixed under
warranty.

My neighbour has an S Type Sport, and on braking to a stop behind a car at a
junction, he allowed the car to pull forward slowly as the queue moved. when
he applied the brake nothing happened, except the RPM went to about 5000 rpm
and he ran into the car in front. Fortunately no damage. Looking on the net
there seems to be a few instances of this happening to a number of models of
Jag.

Has anyone any experience of this fault, The Jag dealer can't find anything
wrong and their diagnostics show nothing. I'm concerned it may be a generic
fault.

Paul Harrison


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Old 08-23-2005, 21:01   #2 (permalink)
Don Young
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Re: S Type Brake failure

As far as I can remember, no one has found a malfunction in any of the many
vehicles this has happened with. It seems to always be blamed on mistakenly
and unknowingly pressing the accelerator rather than the brake. I know for a
fact that this is possible, as I did it once. Luckily, I was just backing up
in my yard and nothing bad happened, but it sure got my attention!!
Don Young
"Paul Harrison" <skyboy01@btinternet.com> wrote in message
news:defr6a$609$1@nwrdmz02.dmz.ncs.ea.ibs-infra.bt.com...
>I have a 2003 S Type and had some problems that have been fixed under
>warranty.
>
> My neighbour has an S Type Sport, and on braking to a stop behind a car at
> a junction, he allowed the car to pull forward slowly as the queue moved.
> when he applied the brake nothing happened, except the RPM went to about
> 5000 rpm and he ran into the car in front. Fortunately no damage. Looking
> on the net there seems to be a few instances of this happening to a number
> of models of Jag.
>
> Has anyone any experience of this fault, The Jag dealer can't find
> anything wrong and their diagnostics show nothing. I'm concerned it may be
> a generic fault.
>
> Paul Harrison
>



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Old 08-24-2005, 01:01   #3 (permalink)
David Betts
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Re: S Type Brake failure

On Tue, 23 Aug 2005 18:50:50 +0000 (UTC), "Paul Harrison"
<skyboy01@btinternet.com> wrote:

>My neighbour has an S Type Sport, and on braking to a stop behind a car at a
>junction, he allowed the car to pull forward slowly as the queue moved. when
>he applied the brake nothing happened, except the RPM went to about 5000 rpm
>and he ran into the car in front. Fortunately no damage. Looking on the net
>there seems to be a few instances of this happening to a number of models of
>Jag.
>
>Has anyone any experience of this fault, The Jag dealer can't find anything
>wrong and their diagnostics show nothing. I'm concerned it may be a generic
>fault.


This is not a fault on the car. This is caused by pressing the
accelerator instead of the brake.

David Betts (davidb@motorsport.org.uk)
The Classic Car Gallery: http://www.ofoto.com/I.jsp?m=17830847103&n=398038677
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Old 08-24-2005, 01:01   #4 (permalink)
Discouri
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Re: S Type Brake failure

"" wrote:
> I have a 2003 S Type and had some problems that have been
> fixed under
> warranty.
>
> My neighbour has an S Type Sport, and on braking to a stop
> behind a car at a
> junction, he allowed the car to pull forward slowly as the
> queue moved. when
> he applied the brake nothing happened, except the RPM went to
> about 5000 rpm
> and he ran into the car in front. Fortunately no damage.
> Looking on the net
> there seems to be a few instances of this happening to a
> number of models of
> Jag.
>
> Has anyone any experience of this fault, The Jag dealer can't
> find anything
> wrong and their diagnostics show nothing. I'm concerned it may
> be a generic
> fault.
>
> Paul Harrison


its most likely to be a short but I cant tell you anymore sorry. this
would explain why a technician cant find the fault. When the car
rolls under different tensions wires may have rubbed through under
friction and when your voltage drops through not using the alternator,
(which kicks in normally at about 2500rpm) faults may show up. It may
be a freak of nature or the wires returning to there original position
that causes the tech to be unable to find the fault on his diagnostic
machine.

Iíve not looked at the looms for this vehicle but I cant explain any
other way why brakes and Rpm would have a conflicting effect. As the
brakes use little electrics try isolating individually the brake
switch on the pedal and the whole of the ABS system. I would favour
an ABS short and would insist this at a Jaguar dealer if I had the
problem.

Please let us all know if you discover the fault and the remedy!

Good Luck!

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Old 08-24-2005, 02:01   #5 (permalink)
David Betts
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Re: S Type Brake failure

On 24 Aug 2005 02:39:00 -0400, Discouri
<UseLinkToEmail@AutoForumz.com> wrote:


>Iíve not looked at the looms for this vehicle but I cant explain any
>other way why brakes and Rpm would have a conflicting effect. As the
>brakes use little electrics try isolating individually the brake
>switch on the pedal and the whole of the ABS system. I would favour
>an ABS short and would insist this at a Jaguar dealer if I had the
>problem.


This is complete nonsense. There is no way that an electrical fault in
the abs system can do anything other than disable abs, which gives you
a warning light on the dash.

This gentleman appears to have suffered from the well understood
problem of inadvertent acceleration. The theory that this is caused by
faults on the car - whether Jaguar or any other marque - has been
debunked ad infinitum.

The most pressing evidence is that - despite the fact that a car's
brakes can overpower the engine - those who suffer this 'fault'
invariably describe pressing the brake pedal harder and finding the
car accelerating faster - ergo, they are pressing the throttle pedal
whilst believing they are pressing the brake pedal. End of story.

David Betts (davidb@motorsport.org.uk)
The Classic Car Gallery: http://www.ofoto.com/I.jsp?m=17830847103&n=398038677
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