It could also be a wheel bearing. When you get to it , do it yourself , or ask for help if you do not know for sure.
Years ago a truck driver came into the shop saying he was not building air fast enough. I am not paying for diagnosis.

Put in the air compressor and get me on the road.

We did. It was about a $1200.00 repair. He paid the bill and left.

When he quickly returned , yelling we installed a defective air compressor

, we asked him if he wanted us to replace the defective line air that was the real problem.

Sometimes , self diagnosis is costly.

Always be sure of what you tell service centers.
Always ask to see the problem. It is your property and it is your right.
da prez