Only 80-84 models have the logic that supports the brake pressure
warning system. I have never opened the brake warning module to see what
is in it but the Bentley diagram indicates that it has solid state
components. That could be the cause of your interference.

Mark

Ken Lewis wrote:

>    I think you may have hit upon something that has always bugged me about
>my truck. There is a point during the travel of the brake pedal that
>produces RF interference on my radio.  I assumed it was just dirty contacts
>in the brake light switch.
>    On the other hand, doesn't the brake warning light energize when both of
>the master cylinder switches do not close simultaneously?
>Ken Lewis
>http://neksiwel.20m.com/
>
>