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Discussion Starter #1
Hello everyone. I am hoping someone could help me out. I have a distinct sound coming from my engine bay. It sounds like the brake dust shield scraping on the rotors, however, I've checked and there is enough clearance between the brake dust shield and rotors. I also replaced both front wheel bearings and driver's side axle. Its driving me nuts. Any idea on what it could be?

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98, OB. 2.2 swap
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It may help if you provide more details as to when the sound is made and when the sound is not made. Turning, braking, slowing down, speeding up, hitting bumps etc...
 

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Cluster Specialist
1999 Impreza RS - WRB
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It might be one of the rear wheel bearings. You can get that scraping sound from the engine bay from a rear bearing starting to fail. I'd start there.
 

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Discussion Starter #6
It may help if you provide more details as to when the sound is made and when the sound is not made. Turning, braking, slowing down, speeding up, hitting bumps etc...
The sound occurs once the car is moving and goes away when stopped. It gets louder when accelerating and is still present when coasting. Tapping on the brakes doesn't help. I feel like it might be a bearing of son sort. Possibly the center diff?

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Cluster Specialist
1999 Impreza RS - WRB
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479 Posts
The sound occurs once the car is moving and goes away when stopped. It gets louder when accelerating and is still present when coasting. Tapping on the brakes doesn't help. I feel like it might be a bearing of son sort. Possibly the center diff?

Sent from my SM-N900W8 using Tapatalk
It is most likely going to be one of two issues: Failing rear wheel bearing or seized rear brakes. A manual Subaru transmission will present different symptoms for failing diff bearing and the 4EAT auto would spit a flashing AT OIL TEMP at startup.

The rear brakes are the cheaper possibility. If the rears are drums, then either a faulty wheel cylinder or stuck brake shoes might cause this, but is highly unlikely. If the rears are disc, a deeper groove in the rotor around the caliper is a sign that the caliper is seized and needs replacing.

Since you mentioned that the noise starts when you drive and goes away when you're not, then you're looking at wheel bearings. Since you replaced the front ones, that leaves the rear ones to check out - especially since they're probably the original ones, which would make them...and the bearing seals...22 years old.

I had this happen to my Type-R project car recently. Same symptoms. Replaced the affected bearing and seals. No more scrapes or noises.
 

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Discussion Starter #9
It is most likely going to be one of two issues: Failing rear wheel bearing or seized rear brakes. A manual Subaru transmission will present different symptoms for failing diff bearing and the 4EAT auto would spit a flashing AT OIL TEMP at startup.

The rear brakes are the cheaper possibility. If the rears are drums, then either a faulty wheel cylinder or stuck brake shoes might cause this, but is highly unlikely. If the rears are disc, a deeper groove in the rotor around the caliper is a sign that the caliper is seized and needs replacing.

Since you mentioned that the noise starts when you drive and goes away when you're not, then you're looking at wheel bearings. Since you replaced the front ones, that leaves the rear ones to check out - especially since they're probably the original ones, which would make them...and the bearing seals...22 years old.

I had this happen to my Type-R project car recently. Same symptoms. Replaced the affected bearing and seals. No more scrapes or noises.
Wow thank you for the detailed response. I will definitely try out your suggestion.

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