(T) Strange wheel wobble

Hi anyone got any suggestions for this one. Just recently, after driving on a motorway for a about half an hour at a steady 70 say I suddenly seem to get a vibration through the steering. It almost feels like I have a flat. If I slow down and shift down to 4th and speed up a little it usually passes. Any thoughts out there. Does not happen all the time. But is happening more frequently.

Your not falling asleep and hitting the rumble strips are you?
In all seriousness though it could be the start to a bearing going off.

Or one of your wheel ballance weights have fallen off whilst travelling.

Very odd, oil level OK in the gearbox? Out of balance wheel or knackered CV sounds most obvious but they would not come on suddenly after an hours driving, they would be there once you get over 20-30 mph...........

check track rod ends and ball joints on front suspension for play.

I had the same problem last autumn.

My problem was the front wheel brake hose. The hose was clogged (it can do this due swelling, even when there are no foreign particles in the brake fluid system), an while the master cylinder had power to force the brake fluid through the hose into the piston, the brake was never really released properly. As a result, the brake pad would constantly touch the brake disc slightly, heating it up in higher speeds, causing vibration. As I slowed down or pulled over, the disc would cool down and the vibration disappear, so it took a while to realize the problem.

And it started occasionally at first as yours did, then appeared more often.

If it is a problem in a brake, it's easy to find out. Next time this happens, pull over and feel all the rims. One of them should be warmer than the others or even quite hot.
And/or you may want to wipe all the rims clean and drive around a few days. If any of the wheels has a slightly jammed brake, it's rim will be a lot dirtier from brake dust than the others.

If you suspect a certain brake, you might see a color changes on the edges of that brake disc from the heating.

Also does your brake pedal feel harder than usually? (This can be hard to notice as it gets harder gradually and you might get used to it. But if the brake jams badly, you'll surely notice it.)

If it is the brakes, you'll need to replce the hoses and pads. If you drive around a lot with a jammed brake, it can warp the brake disc from the heat, and you'll need to replace that too.

Hopefully this helps, at least to rule out one option.

Thanks .. That makes a lot of sense .. I will get to it !!

In addition the the above the brake hoses often corrode from the inside usually caused by dirty brake fluid not changed regularly so filled with moisture. The above happened on my Barchetta even though the fluid was new (maybe the prevous owner didn't change it enough?)

Although I got all the other symptoms I never had any vibration.

If this does happen the brake hoses swell with the trapped fluid so easy to spot.

I would check my wheel nuts. Make sure there tight I have had 2 vehicles in recently with loose nuts.(not to mention the one behind the steering wheel)

I had a set of brake hoses rot from the inside on a 1969 VW Beetle. From the outside they looked fine but the brakes were poo, I had fitted discs all round and could not figure out why they were still bad until I noticed how slow the fluid was coming through when I bled the brakes. Changed the brake hoses and everything was 100% better, out of a metter of interest I cut through one of the hoses and there was less than half the diameter of the hose left!

hello,

i kinda have a simmilar problem... after reaching 50 km/h i hear a noise who comes from behind like a vum vum.... could be the exhaust wich is not fixed? all the rims are balanced so i don't have any problems with them... the braking pads are new... and by the way... i brake kinda hard... could be the breaking liquid?

I ma having the same interesting effects... I think I ve read something similar on an older thread. The problem was rectified with wheel alignment.. I just put a new set of tires on my B so I am waiting to wear them in a bit and then take her to get aligned. I will keep you posted.

Sounds more like the rear bearings but as we're so far appart not easy to diagnose. Although rear bearings are more like Hum Hum than Vum Vum

If your break fluid is anything other than spotlessly clean.....change it.

if you "hear" Bang, Bang... you will probably broke your seat... like i did...

I finally took my baby to the doctor's today and he was kind enough to point out that the rims I got her with were probably from a car that takes different rings on its rims hence there was a bit of play. He changed the a fore mentioned rings and everything seems to be working fine!!! Took her out for a short drive round the island and I fell in love all over again!!!

Hope this helps you out mate!