LED taillights go dim when breaks are pressed?

i recently installed LED taillight bulbs in my 1996 impala SS .. I replaced every bulb in the taillight (BREAK, RUNNING,REVERSE) and i ran into a problem .. when i press the break they go dim instead of brightening also they dont blink when i turn on my turn signals .. Could it be a flasher issue or a resistor issue ? any input would be gladly appriciated thanks in advanced

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