Bob Keselowski -- former ARCA Menards Series champion and father of Brad and Brian Keselowski -- has died after a battle with cancer, the family announced on Wednesday.
He was 70 years old.
Brad confirmed the news in an emotional post ... saying, "My dad will always be my hero. He was quiet and understated, but that didn’t change the impact he had on me or that I watched him have on everyone who knew him."
"I am forever grateful for what I learned from this man, and I will remember him every day."
Brad's brother, Brian, also expressed his sorrow ... saying, "Got the chance to go with my dad a couple times this year to watch him drive his car."
"We never thought we would be here still after 2 1/2 years of fighting this. Still losing him isn’t easy knowing it’s coming, but I’m so glad I took the opportunity when I had the chance to do it."