Dashboard Problem

I just got my CX-7 yesterday, but i got problem from dashboard.

Everything was ok when i drove it yesterday.

After i changed the rear light bulbs to LED light bulbs, something happened.

When i pressed the break when i was driving, the dashboard would turn dark

as you drive at night, but i didn't swich my light to Auto.

If i remove my feet from break, the Dash would change to normal.

Is that the short circuit of the electrical????
 
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