[Jady Pham]

Hey guys,

I've been getting these weird metal grinding noise in the rear axle at low speed lately. Im not sure what it is, i was thinking it might be road debris getting into the rotors or something? anyone else experiencing the same issue or know what it might be? thanks

[SGL]

Originally Posted by Jady Pham

Hey guys,

I've been getting these weird metal grinding noise in the rear axle at low speed lately. Im not sure what it is, i was thinking it might be road debris getting into the rotors or something? anyone else experiencing the same issue or know what it might be? thanks

I had a lot of it during my weekend at the track, so i think its pebbles in the brake shield, there is a thread in the F80 forums, that i picked up on track, at least i hope because it sounds horrible!

[David1]

It's the e-diff......

[Adem1534]

I hear that too, it's normal.

[gthal]

It's either the diff or stones in the heat shields.

[confusion]

Originally Posted by Jady Pham

Hey guys,

I've been getting these weird metal grinding noise in the rear axle at low speed lately. Im not sure what it is, i was thinking it might be road debris getting into the rotors or something? anyone else experiencing the same issue or know what it might be? thanks

Unfortunately for me, the city decided that my street needed to be "re-paved" and proceeded to spray a bunch of tar and then literally have a dump truck dump a shit ton of rocks. No top coat, no sealant, no trucks to roll that shit flat, not even the courtesy of some street sweepers. Nothing but daily traffic to pack it down. I don't live on a very busy street so sadly, it will be months before this sorts itself out. Anyway, I got a piece of gravel caught somewhere in my rear wheel/rotor area. I immediately stopped as I was only driving 5 mph. Drove so I could hear it. Definitely coincided with wheel rotation. I got out to look. Couldn't see it. Had to get going. It ground itself out after about 100 yards. Was super painful to listen to. Hopefully didn't do any actual damage.

[M3 Adjuster]

Originally Posted by confusion

Unfortunately for me, the city decided that my street needed to be "re-paved" and proceeded to spray a bunch of tar and then literally have a dump truck dump a shit ton of rocks. No top coat, no sealant, no trucks to roll that shit flat, not even the courtesy of some street sweepers. Nothing but daily traffic to pack it down. I don't live on a very busy street so sadly, it will be months before this sorts itself out. Anyway, I got a piece of gravel caught somewhere in my rear wheel/rotor area. I immediately stopped as I was only driving 5 mph. Drove so I could hear it. Definitely coincided with wheel rotation. I got out to look. Couldn't see it. Had to get going. It ground itself out after about 100 yards. Was super painful to listen to. Hopefully didn't do any actual damage.

[img]https://farm8.staticflickr.com/7387/...6ccdd30a_b.jpg[/img]

Common issue.

You can try reversing and stomping on the brakes and sometimes it will dislodge the rock.

[LuisMH]

Originally Posted by Jady Pham

Hey guys,

I've been getting these weird metal grinding noise in the rear axle at low speed lately. Im not sure what it is, i was thinking it might be road debris getting into the rotors or something? anyone else experiencing the same issue or know what it might be? thanks

Same happens to me...

[confusion]

Originally Posted by M3 Adjuster

Common issue.

You can try reversing and stomping on the brakes and sometimes it will dislodge the rock.

Will give that a shot next time it happens. Literally happened to me on the way home just now. My wife was outside talking to a neighbor and heard me coming before she had line of sight. She was like, "what's wrong with your car?!!". Shit ground out right as I was pulling into the driveway. Naturally, I was cussing up a storm. Had to apologize to the neighbor.

/sigh

[MTHRAR]

Originally Posted by confusion

Will give that a shot next time it happens. Literally happened to me on the way home just now. My wife was outside talking to a neighbor and heard me coming before she had line of sight. She was like, "what's wrong with your car?!!". Shit ground out right as I was pulling into the driveway. Naturally, I was cussing up a storm. Had to apologize to the neighbor.

/sigh

There is a huge thread over on the M3/4 Forums for the brake shield. It seems to be a common issue on all M cars.

http://f80.bimmerpost.com/forums/sho....php?t=1052226

[atxsk8r]

Originally Posted by confusion

Unfortunately for me, the city decided that my street needed to be "re-paved" and proceeded to spray a bunch of tar and then literally have a dump truck dump a shit ton of rocks. No top coat, no sealant, no trucks to roll that shit flat, not even the courtesy of some street sweepers. Nothing but daily traffic to pack it down. I don't live on a very busy street so sadly, it will be months before this sorts itself out. Anyway, I got a piece of gravel caught somewhere in my rear wheel/rotor area. I immediately stopped as I was only driving 5 mph. Drove so I could hear it. Definitely coincided with wheel rotation. I got out to look. Couldn't see it. Had to get going. It ground itself out after about 100 yards. Was super painful to listen to. Hopefully didn't do any actual damage.

Hate when they pave roads like this, stupid lazy ass cheap paving technique

And what's up with the trash can in the background trying to fit that box in? LOL

[confusion]

Originally Posted by atxsk8r

Hate when they pave roads like this, stupid lazy ass cheap paving technique

And what's up with the trash can in the background trying to fit that box in? LOL

Yeah, it's fucking terrible. I had to buy some armadillo elite's just so I could ride my damn bike for more than 100 yards. If I knew how to successfully sue the city, I would.

Not my house but it's anti-over-zealous-garbage-people that pick up anything that is not literally in the recycle bin. In other words, these people are trying to be good to planet earth.

[atxsk8r]

Originally Posted by confusion

Not my house but it's anti-over-zealous-garbage-people that pick up anything that is not literally in the recycle bin. In other words, these people are trying to be good to planet earth.

Ah, typical Austin. It's either the hipsters or the hippies... lol

[CosmosMpower]

Rocks in the brake shields, happened to me in the F80

[AlexCirci]

Originally Posted by CosmosMpower

Rocks in the brake shields, happened to me in the F80

Thank God.. I've heard this 2 or 3 times now and it sounded AWFUL. It did sound like it came from the rear so I actually stuck my hand in between the shield and rotor and lodged some pebbles out. Had no idea others were experiencing this.. so I had hoped I solved the issue but was unsure. Glad to know I'm not the only one.

[CosmosMpower]

Originally Posted by AlexCirc

Thank God.. I've heard this 2 or 3 times now and it sounded AWFUL. It did sound like it came from the rear so I actually stuck my hand in between the shield and rotor and lodged some pebbles out. Had no idea others were experiencing this.. so I had hoped I solved the issue but was unsure. Glad to know I'm not the only one.

There's a TSB on the M3/M4 not sure about the M2 but you can just bend the soft aluminum shield back a bit and that will fix the problem. Mine happened after driving on to the gravel parking lot at the Nurburgring. I knew what it was immediately.

[gmzanatta]

Originally Posted by confusion

What. The. F*ck.

Who the hell paves like this? That is appalling.

[MTHRAR]

Originally Posted by gmzanatta

What. The. F*ck.

Who the hell paves like this? That is appalling.

It's called tar and chip. And it's terrible. I live in the state of Pennsylvania and this happens a ton on decently traveled back roads. I went on one the other day because my buddy was like "Hey this is a nice winding road" and I wasn't familiar with the roads. I immediately regretted it after I heard stones crushing the underside of the car, lol. That is probably how I got all of those pebbles in my vertical air slats in the front bumper! Luckily didn't get the griding issue, but I had it on my E46 M3 once and thought my pads were worn down to metal on metal grinding!

[kb9uwu]

Originally Posted by gmzanatta

What. The. F*ck.

Who the hell paves like this? That is appalling.

appalling? oil and rock roads are the norm in rural areas. maybe not residential austin, but hardly appalling.

[gmzanatta]

Originally Posted by kb9uwu

appalling? oil and rock roads are the norm in rural areas. maybe not residential austin, but hardly appalling.

I didn't mean appalling at the construction method, just at the really shoddy job they did...