banging noise over speed ramps

[graham2225]

i have had my lovely car now for 5 weeks and started to notice when i go over speed bumps (not more than 5-10mph) a thud from the front but nothing on back shocks.

so was just wondering if other peoples car do the same or if you have any ideas.surely shocks could not be damaged within 5 weeks

[carnivorous]

Dealer forget to remove the block inserts at pdi? It's happened before...

[Yetigreenline2]

Mine has had a thud before cannot remember what speed.

Is there any way of checking for the blocks are they just pieces shoved into the springs to stop them compressing

[Babs]

Do you have a body in the boot?

[looby]

It's just the rear air extraction flaps, quite normal don't worry about it....

[g6zru]

I've heard about these flaps before. What are they and where are they?

Fred

[graham2225]

why would the rear air extraction flaps cause a noise on the front shocks

[briskycat]

graham2225, do you hear that thud on compression or on rebound?

I've heard about these flaps before. What are they and where are they?

As far as I understand, those flaps are inside the vents that are behind the rear bumper:

Those vents are designed to allow air to flow freely out of the car preventing dust from being sucked back in if the pressure outside is higher than inside.

But I doubt they can make sounds that seem to come from the front...

Edited 9 March, 2012 by briskycat

[graham2225]

on the downside of the ramp so on the rebound.no sound comes from the back of the car.

[briskycat]

Well, I am not sure how strong are the sounds your Yeti makes, but mine makes rather weak thuds on rebound on some narrow speed bumps too. Those thuds become really distinguishable and get accompanied by (sort of) weak squeaking and grinding in the cold. All in all I think it is normal

[carnivorous]

Those will be your dry bushes - can be silenced by greasing them properly. Had mine done - no more groans and squeaks on cold mornings...

[rockhopper]

Those will be your dry bushes - can be silenced by greasing them properly. Had mine done - no more groans and squeaks on cold mornings...

How?

[carnivorous]

You can spray them in grease and it should silence them for a month or two. It's a common issue with mk5 Golfs, B6 Passats etc. and is to due to the design of the front suspension (sway bar) (I think). My B6 Passat and MY10 Octavia did it too.

The "proper" way is to remove the bushes, grease them properly and put them back but that's OTT. Dousing them in grease while fitted and going for a drive usually does the trick for a good while.

I had to tell the dealer to grease them and it did the trick on my Yeti...silence. For now.....

[briskycat]

The "proper" way is to remove the bushes, grease them properly and put them back but that's OTT. Dousing them in grease while fitted and going for a drive usually does the trick for a good while.

Just one thing to note. I suppose the proper grease should be not just any grease but a silicon-based one. Using oil-based greases could cause the bushes to swell or even to wear out quickly (unless they are made of polyurithane).

[MacFadyin]

Ideally a set of polyurethene brushes would fix the problem

http://www.candrenterprises.co.uk/shop/superpro/car-Yeti5L

However at that price I'll just go over the bumps moreslowly.

[g6zru]

Brickycat, thanks for the diagram. Very helpful.

Fred

[Kenny R]

A 5 week old car shouldn't make banging noises, nor should it need bushes greased. A trip to the dealer is called for me thinks.

[graham2225]

yes i had it for a drive today a noticed it was only making a thud noise going up a speed ramp.as above its only been on the road now for 6 weeks and only covered 1026miles. might take it to the dealer on monday.going northen lights hunting now

[carnivorous]

A 5 week old car can make noises from the bushes because VAG group install them bone dry on pretty much all their cars afaik.

[graham2225]

so should i take it to the dealer or should i put some grease on the bushes?

[MacFadyin]

I wouldn't use grease but rubber lubricant IIRC it's silicone based and in spray form. We used to spray it on rubber door seals in winter to stop them freezing up.

WD40 may have the same effect

[carnivorous]

You can use silicone grease. Or tell the dealer to lube the bushes for you as they are creaking. They should do it - mine did.

[Timmy 7]

so should i take it to the dealer or should i put some grease on the bushes?

Take it to the dealer. My MINI had a front shock absorber and mount replaced (under warranty) at 4500 miles.

[graham2225]

Take it to the dealer. My MINI had a front shock absorber and mount replaced (under warranty) at 4500 miles.

yep shall take it to the dealer tomorrow and see what they say .shall put an update tomorrow

[Sprockutt]

I've had this thudding noise as well and I think it was mainly from the rear area. It really took me by surprise as for the speed we were doing you shouldn't be bottoming out the suspension which is what it sounded like.

I've been more focused on getting my condensation issues sorted and have just driven over speed bumps very slowly since