WUG sound
Thread Starter
Newbie
Joined: Aug 2013
Posts: 6
Likes: 0
From: Manila, Philippines
2001 benz c240
WUG sound
hi guys, would like to hear your opinion regarding my problem with my C240.
Couple of months ago i was hearing squeaking sounds whenever I press on the brakes. So basically i knew that i had to replace my brake pads. Went to the nearest car shop in my area and had my pads replaced. After 2 weeks, i hear a different sound ("wug" sound) while driving at 15mph. It was consistent on that speed... as the tires were running at that speed you will hear "wug-wug-wug-wug..."
asked some of my friends about it and after hearing it, they said to check on my wheel bearings. Went back again at the nearest car shop and they said yep it is the front wheel bearings which i immediately had it replaced. When it was all ready and done, we drove the car around the block, and it was still there. The sound is annoying and you will hear the sound at slow speed 15-20mph. and when you press on the brakes the sound gets louder and slower. The shop once again said, to have my wheels aligned... so i did. but it's still there.
Now, my options are, to have my tires checked... coz' they say that there's that chance that my tires are worn-off unevenly? my brake discs/ rotors?
Any idea guys?
thank you.
Couple of months ago i was hearing squeaking sounds whenever I press on the brakes. So basically i knew that i had to replace my brake pads. Went to the nearest car shop in my area and had my pads replaced. After 2 weeks, i hear a different sound ("wug" sound) while driving at 15mph. It was consistent on that speed... as the tires were running at that speed you will hear "wug-wug-wug-wug..."
asked some of my friends about it and after hearing it, they said to check on my wheel bearings. Went back again at the nearest car shop and they said yep it is the front wheel bearings which i immediately had it replaced. When it was all ready and done, we drove the car around the block, and it was still there. The sound is annoying and you will hear the sound at slow speed 15-20mph. and when you press on the brakes the sound gets louder and slower. The shop once again said, to have my wheels aligned... so i did. but it's still there.
Now, my options are, to have my tires checked... coz' they say that there's that chance that my tires are worn-off unevenly? my brake discs/ rotors?
Any idea guys?
thank you.
MBWorld Fanatic!
Joined: Jan 2005
Posts: 2,848
Likes: 15
From: Orange County
2005 C Wagon (No snickering please!)
Sounds like the rotors were not in condition to be reused. Benz does not allow rotors to be reconditioned in the workshop, but they are so inexpensive compared to the past. If the rotors are near the minimum thickness stamped on the disc, or a dial indicator shows excessive wobble (runout) they should be changed. Did you get genuine Mercedes-Benz pads? I know there are a lot of counterfeit car parts from China being sold in the PI. Resist their low price and go with what is safe.
I really doubt the noise is from your tires. You can see uneven wear with your eyes, and of course after wheel bearings the car should be aligned to prevent uneven wear. Head over to CATS motors in San Juan (Greenhills) it might be more expensive than the nearest car shop, but they have the experience and parts to do it right.
I really doubt the noise is from your tires. You can see uneven wear with your eyes, and of course after wheel bearings the car should be aligned to prevent uneven wear. Head over to CATS motors in San Juan (Greenhills) it might be more expensive than the nearest car shop, but they have the experience and parts to do it right.
Thread Starter
Newbie
Joined: Aug 2013
Posts: 6
Likes: 0
From: Manila, Philippines
2001 benz c240
Thank you Moviela. I did have my rotors refaced but before i got it done, it was already making that wug sound. I took off the left front tire and tried spinning the rotors and i did see it wobbling... Then i tried spinning the wheels and you can hear the pads scratching the disc at one certain area of the disc which probably makes the disc uneven.
Since i also replaced the front wheel bearings, how tight do you usually tighten the lock for the bearing?
Is it ok to get after market rotors like the drilled and slotted? I see some c240's with these aftermarket slotted rotors.
Thanks again Moviela.
Since i also replaced the front wheel bearings, how tight do you usually tighten the lock for the bearing?
Is it ok to get after market rotors like the drilled and slotted? I see some c240's with these aftermarket slotted rotors.
Thanks again Moviela.
MBWorld Fanatic!
Joined: Jan 2005
Posts: 2,848
Likes: 15
From: Orange County
2005 C Wagon (No snickering please!)
The indicator base is held magnetically to the hub with the point of the indicator touching the center of the spindle. Tighten the nut whilst turning the rotor until the rotor cannot be pulled firmly in and out. Then back off the nut until there is just a little play. Then tighten slowly until 0.01-0.02mm is indicated when pushing and pulling on the disc. Tighten the screw to lock the nut to 11 Nm.
You really should get new rotors if they are scraping as you say.
My opinion on drilled rotors is that unless you are racing on a track it will do nothing for you. It usually does cause hairline cracks to form around the holes.
Slotted rotors are worthwhile on a street car. ATE makes some really nice slotted rotors, as good as OEM. The slots when properly machined act like a Blanchard grinder and lap the surface of the pads every time you brake. This keeps your stops very smooth through the life of the pads.
If in doubt how to set the bearing nut, head over to CATS and spend a few pesos to have it done. You don't want a sloppy front end, another bearing failure, or have the wheel come off!
Super Member
Joined: Mar 2012
Posts: 968
Likes: 62
From: San Francisco, CA
2005 c230SS
I had a similar sound at freeway speeds all the way down to a crawl ... thought it was the wheels bearings, transmission output bearing, driveshaft bearing, differential, etc ... got new tires and it all went away
If youdo not have staggered rims, then try rotating your tires front to back and see if it changes the sound. If you have less than half of your tire tread left then I would say it is suspect.
Thread Starter
Newbie
Joined: Aug 2013
Posts: 6
Likes: 0
From: Manila, Philippines
2001 benz c240
You would be surprised at how many suspension "woes" are due to tires.
I had a similar sound at freeway speeds all the way down to a crawl ... thought it was the wheels bearings, transmission output bearing, driveshaft bearing, differential, etc ... got new tires and it all went away
If youdo not have staggered rims, then try rotating your tires front to back and see if it changes the sound. If you have less than half of your tire tread left then I would say it is suspect.
I had a similar sound at freeway speeds all the way down to a crawl ... thought it was the wheels bearings, transmission output bearing, driveshaft bearing, differential, etc ... got new tires and it all went away
If youdo not have staggered rims, then try rotating your tires front to back and see if it changes the sound. If you have less than half of your tire tread left then I would say it is suspect.
I am rolling on an 18inch AMG rims on a 225/35/R18 front.... and a 255/30/R18 rear... (staggered size rims) in which i can't do the rotating part. Don't have my stock wheels anymore.
thank you again.
Last edited by butchsoriano; Aug 11, 2013 at 12:46 AM. Reason: just added a pic.
