[Avisitor]

Vacuum test of radiator?
Wouldn't the radiator cap allow for fluid or air to flow back into the radiator as it cooled in normal operation?
As far as I know, radiators are pressure tested??

Would fill with water and pressurize the radiator to see where it is leaking.

 

[Avisitor]

Not a fan of Harbor Freight tools for testing vehicles.
But, if you are confident in it then so be it.
However, a vacuum will not let you see where the leak is
A pressurized test would should where the leak is??
No guessing??

 

[Avisitor]

If the brake rotors are rusted the try running the vehicle with short tests on brakes
Sometimes it will clean itself off. Why not test before replacing?
If it clears up then run with it until you can actually inspect it??
If it does not clear up then you know for certain to do the brake job??

I wish you lots of luck and hope it is something simple and cheap to fix