Worn "diff" like noise from rear of car when in motion.
Knowing front wheel drive has no diff, possible wheel bearings or disc brake noise. Hand brake is slack and needs adjustment.
The car sat idle for 2 weeks and at start of 400Km journey home, the noise first became apparent. Quite loud at first then easing off to a oscilating hum, changing in frequency with speed.
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A howling noise from a diff is an indication of the gear mesh( pinion to crown wheel) is not correct. Several reasons being worn pinion bearings--loss of preload on the pinion bearings --- crown wheel carrier bearings failing ---not sufficient preload on the bearings---wear on the teeth from incorrect diff oil in use. or simply wrong diff oil. The grade should be 80w90 OEP for normal or special oil for limited slip diffs.
this is a front wheel drive car. so the only things in the rear wheel area that typically make noise would be the rear brakes or the wheel bearings. Because you notice it more when braking i suspect the brakes are worn out. inspect the brake pad wear on both the inside and outside pads, if they look ok, you would need to investigate further for a possible wheel bearing or hub issue.
Try spinning the rear wheels by hand and see if you can hear the noise, if not it may need to have a load on the wheels indicating a possible bearing, or could be a loose brake pad or backing plate. Also see if anything is touching the drive axels.
could be a rock stuck between the brake rotor and calipers or dust sheild...on the other hand could be badly worn brake pads wearing metal in metal.....maybe even worn wheel bearings. when was your last brake inspection(worn brakes)? have you been driving on gravel roads(possible rock)? how long has this noise been occurring for(progressivly getting louder?-does braking effect if(worn brakes)? is it louder when cornering hard-and will it go away when turning the opposite direction (wheel bearings)??
Have the front brakes checked alot of times the brake pads wear down to the point that the wear warning indicator starts to rub on the rotor or disc and makes a scraping sound when turning, your front brake pads are due to be replaced, I am 80% sure.
The high pitch sound may come from the brake pads as metal parts hit the disc to signal the owner that it needs change. The metal parts gets exposed when the pads have worn out. The brake also has a hub to cover the disc. See if the metal plate is hitting it but this issue would appear when the wheels are in motion. Check if it is the belts, have the tension checked out. Other than that the bearings are the other items on your wheel that could cause a high pitched sound when you car is in motion.
hiya this does sound iffy ? but b4 i comment /offer an opinion could you or your friend jack up the wheel in question that has had repair and look at how the brake disc is secured to the actual hub assy that wheel bearing is housed in ? also caliper? cracked?? is it now a new one? have never had problem renewing front or rear bearings in past using the correct tool/s a hydraulic press is the best method for removing excessive siezed components as for your friend now saying noise is from rear ? it may be pads worne or disc/s corrosion/scoured so investigate and update what you discover ? sounds like big hammer garage?