Check for broken suspension components. Shouldn't be hard to find the culprit, if it is grinding it is making metal shavings and should be able to look for shiney metal parts.
SOURCE: Clunking and grinding noise
My 2003 F150 Supercrew would not engage in 4x4, it ended up being the shifting fork in the front end, cost me $200.
SOURCE: Noise on front left tire
you say you had the brakes done but what exactly did you have replaced? noises from wher exactly?
SOURCE: Loud engine knocking on 2001 Ford Focus
Sounds to me like a very common problem has occured to your neighbor. If this is a SOHC engine, one of the valve seats in the number 4 cylinder has fallen out. I'm sure it has damaged the head and the piston. Stop trying to run it or you might blow a hole in the cylinder wall or break a rod or both.
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