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General Automotive General automotive discussion. This is intended to be a discussion about other not VW and Diesel cars you may have or interested in.

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Old December 23rd, 2018, 19:28   #1
2000alhVW
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Default Ď01 Forester making WHOMP-WHOMP noise in rear after new brakes

I did pads and rotors all around on a 2001 Subaru Forester for a woman I do a lot of work for.
I took it for a test drive after and it makes a very odd WHOMP WHOMP noise in the rear when making a tight turn. 80% sure itís from rear passenger wheel area.

I took the rear brakes apart several times trying to chase the noise down and my personal opinion is that itís a wheel bearing going bad. I couldnít shake any play out of the rear wheels though.
I did some troubleshooting - it only makes it on hard right turns, with no change when using pedal pedal or pulling on parking brake.
I feel itís a wheel bearing, especially as I am superficially familiar that these Subaruís eat wheel bearings regularly, but the owner is VERY anal/neurotic. Single owner car, garage kept, 100% maintenance done at dealer without fail. The owner is very curious why, if it is a wheel bearing, it would suddenly act up after brake work. Which is a fair question

Iíve run out of things to check, or what to tell her, so Iím asking for wisdom here.
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Old December 23rd, 2018, 19:31   #2
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If it's a cheap wheel bearing it'll be pressed together. Pop it apart and see if the race and bearings are pitted.

Every brake job on rotors and drums I always bump the non weared edges with a grinder

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Old December 24th, 2018, 12:00   #3
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I have 2 Subaru Forester 98 and 01 5 speed and have done the rear and front on the Subaru ,, not an easy job either. First get the rear passenger wheel jacked off the ground .block wheels take emergency brake off and see how much play there is in wheel as you grab wheel side to side and top to bottom , if there is play in the wheel , then that is mostly it , it is a known weakness , mind started on the same rear passenger side,, you can go to the Subaru forum and get pictures and step by step tips. Sometimes i would drive down the road about 30mph and do an left to right with the steering wheel and listen to the noise change as u put load on the right side and took it off.
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Old December 25th, 2018, 09:22   #4
2000alhVW
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I’m a decently adept mechanic with the fundamentals. Checking 6&12, 3&9 for play in the bearing. I’m also aware on rear wheel bearings you can sometimes detect play axially by pulling in and out.
I checked the rear wheels for play and couldn’t find any noticeable amount.
Gonna pull the wheels off again and look for fresh contact marks
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Old December 25th, 2018, 10:02   #5
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The reason for it presenting after the brake work is that the brakes are once again what they're intended to be. Often repairing one part causes another associated to present. I call bushings also though because they like to cause each other pain if not replaced together.
The suspension and everything should be renewed together in my opinion. If he's interests in the vehicle, being a Subaru and all, it should be replaced front and back. Bearings all together would be best, but make sure the suspension isn't causing it like a broken spring or sway bar link.
Seen that to on Subie

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Old December 25th, 2018, 12:42   #6
FrankenAudi
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Quote:
Originally Posted by 2000alhVW View Post
Iím a decently adept mechanic with the fundamentals. Checking 6&12, 3&9 for play in the bearing. Iím also aware on rear wheel bearings you can sometimes detect play axially by pulling in and out.
I checked the rear wheels for play and couldnít find any noticeable amount.
Gonna pull the wheels off again and look for fresh contact marks
Are they Drum / or disc ??
Did u Check the rear cv boot and axle??
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Old December 25th, 2018, 13:18   #7
2000alhVW
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Quote:
Originally Posted by FrankenAudi View Post
Are they Drum / or disc ??
Did u Check the rear cv boot and axle??
Disc rotors with drum hats for the parking breaks.
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Old December 25th, 2018, 17:07   #8
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Quote:
Originally Posted by 2000alhVW View Post
Disc rotors with drum hats for the parking breaks.
Did u Check the rear cv boot and axle??
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Old December 25th, 2018, 22:41   #9
2000alhVW
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Quote:
Originally Posted by FrankenAudi View Post
Did u Check the rear cv boot and axle??
I have not yet done any digging deeper than removing rotors and having a quick look.

I think there is some sort of play/shifting.
When I first finished the brakes, the old shims had somehow moved over and were actually grazing the rotors. I found this out when I did the original test drive. There was a gentle scraping that got MUCH worse when turning left or right.
I removed the shims, and the scraping is gone, but it's troublesome to me that making a turn would cause things to shift between the hub, caliper, rotor, and etc...

I'm trying to think of ways to diagnose the wheel bearing for wear. I can't rotate the wheel freely because Subaru axles stay "engage" even when trans is in neutral?
Not sure whats going on here...Raised car, E-brake off, trans in neutral, still takes a lot of effort to turn wheel.
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Old December 26th, 2018, 04:59   #10
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There are lots of crappy Chinastop brake rotors that will not seat squarely on the hubs and cause the parking brake shoes to rub on the inside of the hat.

It will typically leave some witness marks on the edge of the shoe. You may also make sure the parking brake shoes did not get dislodged from their perches and that they are adjusted properly. Again, many Chinastop rotors may not be made the exact same dimensions as the originals.

If the noise suddenly started after a brake job, I doubt it is the wheel bearing. Although wheel bearings are common failure items on these cars.
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Old December 26th, 2018, 06:47   #11
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Quote:
Originally Posted by 2000alhVW View Post
I have not yet done any digging deeper than removing rotors and having a quick look.
I think there is some sort of play/shifting.
When I first finished the brakes, the old shims had somehow moved over and were actually grazing the rotors. I found this out when I did the original test drive. There was a gentle scraping that got MUCH worse when turning left or right.
I removed the shims, and the scraping is gone, but it's troublesome to me that making a turn would cause things to shift between the hub, caliper, rotor, and etc...
I'm trying to think of ways to diagnose the wheel bearing for wear. I can't rotate the wheel freely because Subaru axles stay "engage" even when trans is in neutral?
Not sure whats going on here...Raised car, E-brake off, trans in neutral, still takes a lot of effort to turn wheel.

Here !https://www.subaruforester.org/vbull...te-fix-206577/
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Old December 26th, 2018, 16:18   #12
2000alhVW
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Quote:
Originally Posted by oilhammer View Post
There are lots of crappy Chinastop brake rotors that will not seat squarely on the hubs and cause the parking brake shoes to rub on the inside of the hat.
It will typically leave some witness marks on the edge of the shoe. You may also make sure the parking brake shoes did not get dislodged from their perches and that they are adjusted properly. Again, many Chinastop rotors may not be made the exact same dimensions as the originals.
If the noise suddenly started after a brake job, I doubt it is the wheel bearing. Although wheel bearings are common failure items on these cars.
I'm with you on this one. This is where I'm leaning. Maybe a slightly warped or distorted rotor causing some issues.

I admit, I advised the owner to go with Nakamoto pads & rotors as I had an extremely good experience with them on my 2 MK4s.
I found them on eBay (I know.) - $90 shipped for pads and rotors on all 4 corners. The vendor had a surprising reputation, account age, feedback score etc. But what really got my attention was the abundant claims at superior quality, 10 year warranty, etc.
I slapped them on my Golf about 4 months ago and I think they're nothing short of stellar.
Then a month later I was a return customer - the same kit for my '03 Jetta.
Again, same findings. Both times during the install, I inspected closely for crappy manufacturing hints, subpar materials, etc etc.
Nothing I could find. Beautifully machined and proper weight.

I didn't do such a close inspection the 3rd time here, but I'll get to the bottom of it eventually.

Nakamoto - a Chinese eBay brand with a name! https://nakamotousa.com/#about-us
Quote:
Originally Posted by FrankenAudi View Post
Thanks for that thread. The owner did some searches of her own, and regurgitated "backing plate" and similar to me. Good to have the actual thread though

Last edited by 2000alhVW; December 26th, 2018 at 16:21.
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Old December 26th, 2018, 16:31   #13
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I recall having the same issue - Rubbing ,, several years ago ,, i just remember grinding something down,,in that area,, but can recall what it was. MY Forester has 255k Miles,, and i still love, it ,of course it has upgraded mods.

It may have been inside the rear brake drum rubbing inside against the back plate ,,u should see some marks where it is rubbing ,, just grind the drum lip down enough to stop the rubbing.

Last edited by FrankenAudi; December 26th, 2018 at 16:39.
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Old December 26th, 2018, 16:42   #14
2000alhVW
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lol...

This owner is such a caricature of a Subaru owner. 50 year old, highly educated woman, who's crazy, single, and has a dog. Wears sandals all the time. Spends $1500 at the dealer, on a 17 y/o car, for a new starter to be put in every 4 years.

She got in some weird accident, tore off the front fender, bashed in the rear quarter. Paid me to put duct tape over it and slap the body cladding back on so "maybe she won't get pulled over".
"Just until my new car gets delivered"

She waited 3 months until the 2019 Foresters came to dealers (because, of course, she can't drive anything but a Su-bah-roo). She would not settle for a 2018, because of the 1mpg difference, and Apple car play addition to the 2019 model year. "They're re-vamping the whole car for 2019. It's silly to buy a '18".

Meanwhile, she's driving a duct taped car to her $200k/yr job. 5 speed, by the way. Because she didn't trust automatics when she bought it in 2001.

So...November comes and her, brand new, 2019 Forester gets delivered.
She paid the dealer to drive it to her house because she "just couldn't do it".
She now parks the new car in the garage, permanently, and continues to drive the old one to work every day.
She mainly parks the car in the garage because she's scared to let rain get on it.
I kid you not, when we shuffled the old one in the garage for me to do the brakes (1-car garage), she ran out of the house (while on a conference call for work) to put a tarp over the new car because her dog barked with a "specific tone" that usually means it will rain soon. She also detected a slight bit of howl in her dog's bark, and that sometimes indicates hail. I had to use the absolute best of my calming abilities for that conversation.

It's been 6 weeks and the new car has ~50 miles.

Did I mention she's single?
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Old December 26th, 2018, 16:52   #15
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Did I mention she's single?

Surprise surprise.
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