I can see an arcing brake switch generating noise, and maybe the other
radio had better immunity (power line filtering). Replacing the arcing
brake switch or installing a line filter should fix it. (But you say it's only
on the first application of the brakes?)
And now for something completely different :-) (but somewhat related)
My '65 Corvair has these spring assemblies inside the dust caps for the
wheel bearings that were installed whenever radios were ordered. Sounds
like "snake oil" to me, but I think the rational was that static was being
generated by the rotating tires that would periodically discharge. I guess
the springs "grounded" the rotating wheels to the spindle and prevented
this discharge. (Like truck drivers dragging chains?).
Now just maybe.......... Nah!
-Bob T.
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