One thing for certain this problem is not going to get any cheaper by ignoring it. Get it checked and repaired if necessary before it gets really expensive.
Just stop and think, front end grinding sounding like metal on metal, frightening!!! have you considered what's going to happen when whatever is grinding eventually falls off when you are going 'over 50'.
It's impossible to determine what it is without driving the vehicle. I'm betting on brakes or wheel bearings. Go find a mechanic.
If it's louder when you turn right if could be the wheel bearing. I paid $120 for a no name but trustworthy mechanic to do it. Part is about $35-40 the rest was labor. If it only happens when you brake, it could be the brake pads.
Go see the tech, the one who inspected it before you bought it.
Ask why it started after inspection,
It could be the indicator on some types of brake pads or something serious.
I mean immediately.
At that mileage and having noise like that, it should be torn down to inspect including removal of caliper and rotor.
If luck is your mechanic, a stone may fall out.
A loose shield or cover on the wheel ends or the driveshaft or even exhaust can make that noise at the right speed producing the right frequency, then when something changes in speed or height or load, even RPM, it goes away.
Sound can be elusive, radiate, telescope, or be different when you are sitting in a different seat.
Reproducing it for some experienced ears is the faster diag.
Then if it does it or stops when on a certain type of lift, he can find it, or eliminate some possibilities.
I would drive along the back of a building with each window down if i could not find it.
Those speeds indicate bearing, but it would rumble or growl.
Grinding may indicate it was VERY LOOSE.
That is why you take the mechanic for a road test.
Impossible to no for sure without seeing the vehicle but I'd say eithe brakes or wheel bearing
Without actually getting under the car and looking it is impossible to say what the problem is, how bad it is, and what the consequences might be. If you don't have the mechanical knowledge to diagnose the problem, find someone who does.
Brakes don't last forever so get into a "brake & muffler" place or your trusted garage guy, asap. It might be just something simple like a rock but sounds like brake pads, etc.
Sounds like wheel bearing or break pads get them checked
could be a bad bearing, or worn out break caliber or drum
the brakes perhaps?
I recently bought a 2007 standard mazda5 with about 135,000 miles on it. I've had it for about 2 weeks now and I have started noticing a very loud grinding sound coming from the front end of the vehicle mainly on the left side. It starts at around 30 miles per hour and continues until I hit around 50. Then it stops. It does not shake really badly when I go fast it is just the sound of metal grinding against metal. I am wondering how serious it could be, what you all think it could be, and how much trouble am I in lol?