Brera 2.2 petrol engine going over bumps problem - Alfa Romeo Forum
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Brera 2.2 petrol engine going over bumps problem

Hi Guys,

I own a Alfa Romeo Brera 2.2 petrol engine, but everytime I over the bumps (especially the ones right in the middle of the road), it will scrap the bottom of the car. I notice that this is much more severe with passengers!
What I do now is I just go over the bump slowly with one wheel but this is really annoying knowing there are so many of them here in London.
Is there a way to resolve or even alleviate this problem, like raising the suspension or getting bigger alloy wheels such as 18 inch (my Brera currently has the standard 16").
I am sure I am not the only one with this problem, and any help is greatly appreciated!

Many thanks in advance
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Its the under tray that is scraping, I just avoid speed bumps but like you say one wheel up on the bump gets you by.
Wheel size wont change anything, mine are 19" but low profile tyres where yours are 16" with fat tyres.
Definitely dont want to go raising the suspenion, lower yes but not higher.
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Never had a problem with scraping in mine.
The again I do go very very slowly over them. I think that's the idea.

I don't think I've ever seen a Brera with such little wheels - 17'' was standard according to my brochures IIRC, and even those look too small.
I know the GT had 16'' as standard, not that you see many with that size.
Can you post a pic?
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Thank you both for your replies.

1. SpiderSaint hmmm, you are correct. Even if I go over the middle humps slowly with both tyres it still scapes the undertray (possibly because the distance between left and right tyres are too wide apart so the tyres don't go over the bump properly, scraping the undertray?), but only slightly if only me in the car. Wouldn't changing the tyres from 16" to 18" raise the car up by 4 inches alleviate this problem slightly?
I don't get it
2. Lussoman I will post a pic when I get back home for you, but I am pretty sure they are 16"

Thank you very much guys!
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Originally Posted by fong21051 View Post
Thank you both for your replies.

Wouldn't changing the tyres from 16" to 18" raise the car up by 4 inches alleviate this problem slightly?
No. The 'rolling' radius always has to be the same otherwise the gearing & speedo would be all over the place.
So if you have 16'' wheels the side walls of the tyres will be bigger, if you have 19'' wheels the tyre side walls will be smaller, but the overall wheel/tyre radius/diameter is the same.
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I discovered this problwm too going over the smaller humps. Just have to go slow with one wheel on the hump.

I also had it when i drove down some single width lanes in Scotland, was a 10 mile road of tears.

On plus side people have longer to stare at you car when going slow!
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Well my Brera is a Prodrive, so is lower still and I dont suffer this problem, Like Spider Saint said, its the undertray. Check and make sure it fixed properly and not hanging down.
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Quote:
Originally Posted by fong21051 View Post
...it will scrap the bottom of the car...
Bottom of the car is plastic unrerride guard actually.
Just have a look down there. It could happen some fix bolts are loosen and guard are positioned lower.
If guard is ok I would suspect suspension fatigue. What is the mileage of the car ???...
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Bye, bye Brera

My Brera has no problem straddling London speed bumps. Did your car have a previous owner? Maybe they lowered the suspension? I've had 17" wheels and 18". Never a problem for me.
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It's actually better for the car to go over with both
wheels.

It's just the plastic undertray protection scraping.

Making sure you don't brake hard just before
taking the bump helps the car not to "dive".

The Brera is a hell if a lot better than the 147 which
has terrible clearance at the front, resulting in
nearly all if them having the under bumper rubber
lip ripped off.

The 1750 is worse than the 2.2 also.
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(Post Link) post #11 of 71 Old 27-08-16 Thread Starter
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Thanks guys, I have just uploaded a photo of my Brera and the wheels are: 215/55 R16 93.

1. My Brera is 2006 model
2. It has only one previous owner and currently has only done 45K miles (I brought the car when it had 43k)
3. I am surprised that some Brera owners don't have the same problem considering how low the car is.
4. Would raising the suspension fix the issue? Or is it a problem with the undertray?

Many thanks
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They look like 147 wheels.
My March '07 spec brochure starts at 17''.
Maybe those wheels were offered on the very first cars, then quickly dropped.
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16 were available on lower trim specs.

Didn't think they sold any in the UK.

I think if you put 18s on you'd gain a few mm of rolling radius.


I'll leave the math to someone else:


http://www.diracdelta.co.uk/science/...l#.V8F-JqNPrX4
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I'm not sure how you would raise the suspension, it doesn't look lowered to me so standard springs should only leave it at the same height. Even if you could it would look daft.

It would look much better with 18" wheels anyway so nothing to be lost by trying that. There are always a few sets on eBay and you could sell your current wheels to offset some of the cost.

If you jack the front you will be able to slip under and see if your undertray is hanging low. Don't be surprised if some of the fixings are damaged. You could just take it off completely. Mine is at the moment and I have noticed zero difference.

Btw my suspension is lower than yours and I have never had a problem over speed bumps.
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Do what I did and get the undertray removed. There's plenty of space between it and the engine. The bloody things are a nightmare to remove for oil changes, etc and cars never used to have them..
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It is not needed to raise suspension.
It is needed to make sure suspension is OK.
Spring may be broken for instance. Broken spring in many cases is identified at visual inspection only.
Broken spring makes related dumper ( shock absorber ) weaker which may create explained problem.
Anyway suspension is to be checked definitely.
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Bye, bye Brera

https://tiresize.com/comparison/

My Brera's manual specifies 17, 18 and 19 inch wheels, not 16. I run 235/45 x 18 tyres. Drop your numbers into the chart on the link above, and you can see that fitting 18 inch tyres would raise the car 12mm and it would (IMHO) look better, too.
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(Post Link) post #18 of 71 Old 28-08-16 Thread Starter
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Hi guys,

Wow this forum is great for Alfa knowledge and thank you all that contributed to my thread . OK I seem to have 2 options as advised:

1. Change the wheels from 16" to 18" (which will make 12mm difference as mentioned by Frenchlunch)
2. Completely remove the undertray (picture attached)

Option one is quite expensive even if I offset the cost by selling my old tyres as suggested by Rewe because I need to buy 18" rims and tyres which are still expensive on eBay.
I had my car inspected last month and all 4 wheels still have 5-7mm tread. They are Pirelli wheels and with so much tread they still have plenty of life in them so I would like to keep

OK I had tried my best to take a pic of the undertray. From your visual opinion is it hanging low? And would there be any implications if I get a body shop to just remove it completely? This would probably fix the problem, right?

Many thanks!
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Looks okay. They do sag in the middle a bit over time.

I wouldn't remove it. They are there to give you some protection
from road debris.

You only need to be really careful about reversing over stuff.

Just live with it until you can upgrade your wheels.


I spent 5 years with a 147 that was much more prone to scraping
and even had to replace one section of the tray after getting stuck
on packed snow.

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Thanks Tata, but you can see how low it is hanging to the ground. No wonder it always scraps when going over the centre of a middle speed hump (the sleeping policeman speed humps don't scrap though )
Surprised some owners never get this problem!
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So the question is: to remove the undertray or not?
Rewe and DC here mentioned they removed theirs and had no problems. Any other suggestions? What will be the disadavantages/advantages?
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Wheels on picture are basic for 159" Phase 2 cars ( 2008+ )
2006 production Brera might not be delivered with wheels like attached.
Anyway I am sure it is not a wheel/tire problem here provided tire pressure is correct.
Tire pressure of 1,5kgs/cm2 ( not sure your psi ) is not quite visible and might create discussed problem.
Nice to check.
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(Post Link) post #23 of 71 Old 28-08-16 Thread Starter
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Thanks Buon, but definitely not tyre pressure problem as I fill up the tyres every month to 33psi
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Quote:
Originally Posted by fong21051 View Post
Thanks Buon, but definitely not tyre pressure problem as I fill up the tyres every month to 33psi
My handbook says 2.3bar (34.5psi) all round or 2.6/39 for full load with 16"s
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Thanks Buon, but definitely not tyre pressure problem as I fill up the tyres every month to 33psi
Not sure how you call it exactly.
Do you have a kind of suspension peck with bottom scraping.
This peck should be while speed breaker ( dead policemen ) pass.
The question is how deep this peck.
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