[jdhartman]

My V50 has 45K miles on it and recently I have noticed a problem under braking. When I slowly slow down from 60 to 40 mph there is a noticable shake in the steering wheel you can feel and see. The car doesn't pull to one side or the other and if I use a moderate amount of pedal to slow down it's fine. I'm thinking it might be an alignment/ tire balance issue? Anybody else have anything like this happen to them? Thanks for any suggestions.

 

[laser8302]

Re: shake under braking (jdhartman)

This usually happens when your brake discs are warped. Make sure that whoever rotates or changes your tires uses the proper lug nut torque. Take it to the dealership and they should be able to warantee it.

 

[mattdoc]

I tried having that warranteed, but they claimed "wear item" and dismissed the idea, even though I checked my lug nut torque after it was in a Volvo service dept, and it was unevenly torqued to 50-75 ft*lb higher than spec. <p>It could be warped rotors, but it's more likely uneven pad material transfer to the rotors, causing them to be shaped just like a warped rotor. Its obvious effect is the shaking under braking, especially getting off the highway. Secondarily, it can mess with anti-lock in an emergency situation; you should replace them soon. You'd be wise to replace your pads at the same time. <p>I don't know whether you can get them turned down or not - I've heard a lot about our factory rotors being un-turnable due to a composite construction, but I do not know for sure.

 

[DGBibo]

could it be balanced wrong? i guess you'd notice on acceleration too then......

 

[zerocover]

Volvo rotors are unturnable. I hear they totally eat up a blade.<p>This means either get new rotors. Or you can make sure the problem doesnt happen again and get new pads. A set of ceramic pads will sand out any material transfered to the rotor leaving it nice and clean. + you get all the benefits of ceramic.

 

[genjy]

My Mazda5's steering wheel would shake under hard braking.<p>Then I loosened all the lug nuts and re-torqued them, and the problem went away, as far as I can tell.<p>The guys who installed the new tires didn't really care about lug nut torque.

 

[-ForceFed-]

Re: (genjy)

Sounds like warped rotors to me, not sure if that would be considered warranty i doubt it anyway. Have the rotors checked for run out, then replace if bad and also have them sand the pads with a new surface if your not replacing them as well. <p>If it was a tire issue it would matter if you were braking or accelerating should do it just about all the time due to it merely being a rotational issue.

 

[V50_T5]

Re: (ForceFed Motorsports)

yeah, I got that too. I'm sure I have warped rotors as well. Probably overtorqued the lugs <IMG NAME="icon" SRC="http://www.vortexmediagroup.com/images/banghead.gif" BORDER="0">

 

[-ForceFed-]

Re: (V50_T5)

Hmm, i use my 80lbs torque stick on volvo lug nuts and 100lbs torque stick on bolts.

 

[kpsingh0]

this started to happen for me after i lowered my car

 

[-ForceFed-]

Re: (kpsingh0)

Probably just a placebo, people always are more attentive to there car after they do something. So noises and other things may be more apparent since your looking for them. Odds are its just a brake rotor thats warped from hard braking or just got really hot. Any long trips with stop and go traffic or heavy braking lately?

 

[carreragt7]

Re: (ForceFed Motorsports)

Weird. I had something kind of like this happen to me yesterday when I went for a short trip...my car had some issues speeding up around 60mph and slowing down, but when I was around 75mph I seemed to be running fine. When I was pulled over for a minute or two it almost felt like the car was going to die, so I think it might be something more serious like tranny fluid or something. I am not mechanically minded at all so any suggestions would be great. I am supposed to get my 60k service soon so I am hoping the guy will let me know if anything really bad is going on...

 

[phillm3swede]

carrera, the color scheme in your sig should aslo be the color scheme on your car : )

 

[carreragt7]

Re: (phillm3swede)

That would be cool, and I have thought about it. I am wanting to keep it a more serious color scheme and I am afraid a bright green would make it too tuner-like. I want to keep the euro vibe alive... S40Forums <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/wink.gif" BORDER="0">

 

[Scotts40]

95% certain at least one of your rotors is warped.<br>

 

[jdhartman]

Re: (Scotts40)

I checked the lugs and they were way too tight. I loosened and re-tightened them w/ no luck. I'm taking it in to have the rotors checked today. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/mad.gif" BORDER="0">

 

[DGBibo]

do the S40s have the same soft metal that the S60 uses?<br>and how long has it been since new rotors?<p>good luck man

 

[jdhartman]

Re: (DGBibo)

My wife has an 02 S60. Her car has the lugs with the studs attached, so I'm guessing it wouldn't be as much of an issue. I got my car 1 year ago, pre-owned, and as far as I know the rotors are still stock. How long should rotors on our cars last? I had a VW before this and changed the rotors around 75K.

 

[DGBibo]

ive been told different things, and i know that people with the same car, same brakes, same rotors that have had to change them before mine.<p>ive been told anywhere from 60-80K

 

[carreragt7]

Re: (DGBibo)

Freak. What price range should I be looking to pay for new rotors? I am going to have my indie guy take a look at everything when he does my 60k service. He is usually very fairly priced on the labor, but I know I can get parts cheaper, and he is willing to install parts bought elsewhere. Super nice guy, I highly recommend Ray's Auto in Orem, UT to anyone within reasonable distance. I think I'm the only UT guy on here though (with an S40, I know a couple guys have Rs).