stevebower Posted May 25, 2006 Report Share Posted May 25, 2006 After a quick trip on the motorway for about 20m I noticed a vibration gradually appear, felt through the whole car. Slowed down & it got worse down to about 40 mph. It got quite severe, as if I was driving over a cattle grid. Not particularly noticable through the steering wheel. I stopped the car, had a look at all the wheels (no flat tyres) so thought that I would carry on. No vibration! It stayed OK, even after a brisk razz between Buxton & Macclesfield (S8346 territory). What should I look at to check, or is it a trip to the stealer (or in my case, Ric Woods)? I wondered about propshaft bearings, but can't work out why the fault should disappear. S8 has done 84k miles. Steve Link to comment Share on other sites More sharing options...
drmotorsport Posted May 25, 2006 Report Share Posted May 25, 2006 could be you picked up some debris that got stuck in the wheel unbalancing it, lost a wheel balacing weight, or possibly you might have loose wheel nuts. Best whip the wheels off and check for foreign bodies and retorque the wheel nuts. Link to comment Share on other sites More sharing options...
spencerbruntlett Posted May 26, 2006 Report Share Posted May 26, 2006 Had this happen once where the ply's of the tyre seperated, only showed itself when the tyre was hot, and resulted in a bulge appearing in the middle of the tread. Link to comment Share on other sites More sharing options...
cruiser647 Posted May 26, 2006 Report Share Posted May 26, 2006 Presume the wheels are done up OK? Link to comment Share on other sites More sharing options...
stevebower Posted May 26, 2006 Author Report Share Posted May 26, 2006 Happened again. Gradual > bad vibration, stopped the car, no further trouble. Will have all the wheels off this weekend. Also try & get up on the ramps at KwikFit ("just check the exhaust, would you mate?") to have a look. Cheers Steve Link to comment Share on other sites More sharing options...
ronmcl Posted May 26, 2006 Report Share Posted May 26, 2006 I had something that sounds similar on another car recently. Turned out to be an intermittantly sticking caliper. Two pistons on the same side of the caliper, one was sticking and one wasn't. The effect was to have the pad angled against the disk which caused a juddering. Sometimes it was there and sometimes not. In my case it was worse immediately after moderately hard, but not severe, braking. Like your problem it would go away when the car stopped and started again. Maybe worth checking the pads? In my case it went on for a few weeks before I got round to looking at it and by that time the uneven wear on the pad was quite noticable. Link to comment Share on other sites More sharing options...
stevebower Posted May 27, 2006 Author Report Share Posted May 27, 2006 Update: Been checking the brakes/wheels. Noticed that one of the front disc's surface was flaking: Flaking brake disc Could this be the problem? Steve Link to comment Share on other sites More sharing options...
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