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Car Forum / Ford / Ford Cars / March 2009

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Flickering brake lights in 2006 Taurus SE

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Rick - 04 Mar 2009 03:32 GMT
Hi all.

Recently bought this vehicle. Overall fairly happy with it; but the
brake light drives me nutts in the dark!

When the brake is applied the lights come on almost immediately, as
they should.

But, say when the brake is all the way down, and I let it go for as
little as a milimeter, the light goes out. If this is done repeatedly,
such as when driving at low speed in a traffic jam, the result is that
the brake lights flicker like hell.

I'd prefer the light to go off only when the pedal reaches the fully
released position, or almost.

In previous cars I've owned this kind of adjustment was easy to do, by
bending the brake switch mount a bit.

The brake switch in this vehicle however seems to have a mind of its
own. Why is it that the on/off position isn't the same (such as you
would expect in a regular switch).  Is there some kind of (electronic)
logic involved?

Also, I've had to follow my own car a couple of times, and it's no fun
looking at those flickering lights: you just don't know if the car is
stopping, or going forward! And I assume many other drivers think the
same; so for safety's sake I'd like to "fix" this brake light
behavior.

Anyway, if there is a simple way to adjust this thing so that the
light stays on longer then I'd really like to hear it.

Thanks in advance,

Erik
Andrew Rossmann - 04 Mar 2009 21:47 GMT
In article <bb2d0047-6b9e-4127-bd98-8c717e60d116
@g38g2000yqd.googlegroups.com>, cyteborg@gmail.com says...
> Hi all.
>
[quoted text clipped - 11 lines]
> I'd prefer the light to go off only when the pedal reaches the fully
> released position, or almost.

The Taurus/Sable has a weird way of working the lights. The switch
itself has very little physical movement. It is mounted to the brake
pedal arm and works on the small amount of play between the pedal and
the rod to the brake cylinder. When you back off on the pedal, the
switch releases for a split second until the rod retracts back and puts
pressure back against your foot.

Ideally, there should have been a small turn-off delay module. But for
cost, and even safety reasons, the wiring is kept direct.

A more common brake light switch setup has a Normally Closed switch in a
fixed position. When you press on the brake, the pedal moves away from
it, which closes the circuit (you hold the switch down to open the
circuit.)

I should point out there is a second brake switch if you have cruise
control. On mine, it's a large blue switch with a long rod that is
normally closed, and only opens (cuts power to cruise control), when the
brake is pressed beyond a certain point. It's a safety backup, as the
regular brake light switch also tells the cruise to disable. This switch
cuts the power to the cruise control module if the brake light switch
has failed open.

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If there is a no_junk in my address, please REMOVE it before replying!
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law!!
http://home.att.net/~andyross

Rick - 17 Mar 2009 05:20 GMT
On Mar 4, 4:47 pm, Andrew Rossmann
<andysnewsreply@no_junk.comcast.net> wrote:
> In article <bb2d0047-6b9e-4127-bd98-8c717e60d116
> @g38g2000yqd.googlegroups.com>, cyteb...@gmail.com says...
[quoted text clipped - 42 lines]
> All junk mail senders will be prosecuted to the fullest extent of the
> law!!http://home.att.net/~andyross

Hey, thanks. That helps me out a bit. I may be able to do something
about this crazy flickering after all...
 
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