2006 Dodge Grand Caravan rattle from bottom left stearing wheel

2006 Dodge Grand Caravan SXT v6 3.8L 50,000 miles
I noticed a fast rattle(rattle did not change speed as rpms increase) comming from the bottom left of the stearing wheel when driving it would start at around 1500rpm, then as the rpms increases the rattel quites down and when it drops to below 1500rpms i can not hear it

if I put the car in park and rev the engine to 1500, I do not hear the rattle, also i can not hear the rattle in reverse/park/1/3

but can hear it again if I Hold my foot hard on the brake and rev the engine to 1500rpms,

My thought is maybe
power brake booster check valve but the brake pedal operates normally(no extra movement)

thanks for any thoughts

ps, I am getting new tires and an alignment done as the tires are worn out and show extreme wear on the inside tread, but since I can get the rattle when sitting still figured it is not part of the tires