[V8] No rear brake light wackyness

Ingo Rautenberg ingo.rautenberg at gmail.com
Wed Oct 10 12:35:14 PDT 2007


Ron, I believe the black one is for the brake lights and the clear is  
for the cruise control interrupt switch.  The one for the brake  
lights works such that when the brake pedal is depressed the switch,  
which is normally closed, is opened and when open the contacts inside  
are closed.  So make sure you're checking the right way!  Usual  
failure mode IME is the brake lights don't turn off -- and that's  
because the hold-down nut is worn and the switch closes the circuit  
and the brake lights stay on all the time. I haven't seen the actual  
switch fail either. But that's from memory.  I'd check but I broke my  
right leg tibia bone Sunday afternoon.  No driving/wrenching ANYTHING  
for me for a while :-(

Ingo

On Oct 10, 2007, at 3:18 PM, Ron Wainwright wrote:

> I did check the switches at the back of the brake
> pedal...there's a Black one & Clear/White one..which
> do I check. But anyway....
> ...I put a circuit tester on the wires there & the
> circuit tester doesn't light up..as I mentioned in my
> original post.
>  But not sure why those would be bad...I've never had
> to replace them in any Audi I've owned.
>
>  Ron
>
> --- Ingo Rautenberg <ingo.rautenberg at gmail.com> wrote:
>
>> Ron,
>>
>> Did you check for continuity in the circuit from the
>> brake light
>> socket to the brake light switch?  That'll tell you
>> if there's a
>> problem in between.  You may indeed have a bad
>> switch (you should
>> have plenty of spares in your depot).
>>
>> Best of luck.
>>
>> Ingo
>>
>> On Oct 10, 2007, at 2:44 PM, Ron Wainwright wrote:
>>
>>> The turn signal & hazards work as they should.
>> It's
>>> the brakes that don't work. The dual filament bulb
>>> lights up one of the filaments when I turn the
>> HL's
>>> on...but when pushing on the brake pedal the other
>>> filament doesn't lite up. Totally different bulb
>> from
>>> the turn signal/hazard bulb. & the rear light's in
>> the
>>> windshield obviousley don't work eather...just for
>> the
>>> record.
>>>
>>>  UPDATE....I pulled the fuse box & everything
>> looks
>>> good, all the connectors are were there supposed
>> to
>>> be, ect. The reason I mention this is cause a
>> lister
>>> mentioned I may have to change out
>> fusebox's.....but I
>>> don't think it's a fusebox issue..remember when
>>> pushing on the horn..which is tied into the same
>>> circuit the Logic
>>> relay for P/N-lock (relay possision 15) & relay
>> for
>>> back-up-lights (possision 14) in the second tier
>> of
>>> relay's, they click.
>>>
>>>  Ron
>>>
>>> --- sdewitt at stx.rr.com wrote:
>>>
>>>> Somewhere in all that mess, is tied into the
>> hazard
>>>> light switch circuit. might want to check that,
>> as I
>>>> recall, both the hazard and the turn signals are
>> the
>>>> same bulb.
>>>>
>>>> ----- Original Message -----
>>>> From: Ron Wainwright <ron_01056 at yahoo.com>
>>>> Date: Wednesday, October 10, 2007 12:48 pm
>>>> Subject: [V8] No rear brake light wackyness
>>>> To: v8 at audifans.com
>>>>
>>>>> Listers, small problem with my rear brake
>>>>> lights...THEY DON'T WORK!
>>>>>
>>>>> So I check the fuses & while didling with fuse
>>>>> #3....horn/brake lights/P-lock buzzer/2nd & 3rd
>>>> stage
>>>>> fan relay...I can see it lighting up, or
>> arching,
>>>> &
>>>>> while pushing the horn in I hear & feel the
>> Logic
>>>>> relay for P/N-lock & relay for back-up-lights
>>>> click.
>>>>>
>>>>> All bulbs are good, license plate lights light
>> up,
>>>>
>>>>> hazards work, turn signals work, ect...just no
>>>> brake
>>>>> lights.
>>>>>
>>>>> I all so checked the brake switches at the
>> pedal,
>>>> but
>>>>> couldn't get eather to light up with a circuit
>>>>> tester...is that my problem...the pedal
>> switches?
>>>>> I replaced both relays in the pannel as well,
>> but
>>>>> they still click.
>>>>>
>>>>> Any help would be great since in 2 weeks I'll be
>>>>> dropping the car off in MN to it's owner.
>>>>>
>>>>> Ron
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>
>>
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