Rear bumper removal

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flybobbie
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Rear bumper removal

Post by flybobbie » Mon Oct 17, 2016 10:15 pm

Couldn't find anything on the internet so thought I would post a few pointers.
Wanted to replace my standard bumper in orion silver to the M-sport due to minor scratches I have had since I bought 2nd hand from BMW.
To remove the bumper:
1/ Remove all the 8mm a/f screws you can see under bumper.
2/ There are two hidden away behind the bumper, one left, one right, where the bumper meets the rear wing, behind.
So need to gain access behind the wheel arch trim liner.
Best I found was to remove the wheel, then the liner.
Then remove the screw with a long reach 8mm a/f hex socket driver.
Image
You can just about reach the screw without removing the wheel, but was a pita to replace with wheel on.
3/ The bumper will now pull rear wards and the sides will spring out, out of the clips.
Image
ImageHope this will help someone not to break the delicate holes in the bumper (Like I broke two before I realised by looking at the new bumper two holes for screws).
When removed rear looks like this.
I did remove the rear lights, but the bumper could be removed without touching these.
Enabled me to give them and that area a good clean.
Image

Interesting to note the black panel mouldings left and right are specific to non and m-sport models.
The lower mounting holes are not the same and don't line up.
Real oem shows different part numbers, now I know why.

Interesting to note the rear grommets, which could be a source of water leaks into the centre or outer compartments.
The green button in the boot connects to a cable to the fuel flap, when pulled it opened the flap. Needed quite a pull.
It also passes through the bulkhead and could be a source for leaks.

Also the rear crash bar has two sticky out pieces ready to give two nice dents into anyone ramming you, then a fairly solid bar.
Can see why any minor bump causes so much damage to the plastic bumper, there is no rear support to spread the load like say foam.
My original bumper has a small dent just left of the right hand sticky out thing.
Job done.
Image
Last edited by flybobbie on Sun Oct 30, 2016 4:04 pm, edited 2 times in total.

goldbcfc
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Rear bumper removal

Post by goldbcfc » Fri Oct 28, 2016 8:02 am

Its amazing Bmw kept that poor designed plastic bracket which gets brittle over time and snaps ive had 2 e85 now where ive had to replace them. Where the angled part goes down and atttaches to bumper they can break thenthe bumper comes loose. Weight saving i suppose but very cheap design like a lot of things ive noticed on Z4 working on them

flybobbie
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Rear bumper removal

Post by flybobbie » Fri Oct 28, 2016 9:42 pm

Weight saving = cheap, so that is the driving force.

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cj10jeeper
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Rear bumper removal

Post by cj10jeeper » Sat Oct 29, 2016 10:28 am

goldbcfc wrote:Its amazing Bmw kept that poor designed plastic bracket which gets brittle over time and snaps ive had 2 e85 now where ive had to replace them. Where the angled part goes down and atttaches to bumper they can break thenthe bumper comes loose. Weight saving i suppose but very cheap design like a lot of things ive noticed on Z4 working on them
Surely the whole purpose is they are sacrificial brackets so that if you bump the car the brackets break or release the bumper and not transmit the impact into metal panels that then bend. Then you'd be cursing if you needed a new wing or rear quarter for every car park tap or zealous mech removing the bumper.

Has to be a subtle trade off between strength and breaking.
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charmlea
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Rear bumper removal

Post by charmlea » Sun Oct 30, 2016 12:07 pm

many thanks for this great post, im just about to remove mine this morning due to some little ragie hitting me up the arse end in an astra and driving off, he hit me with such force i thought the total rear end would be a right off, the only damage was to the bumper thanks to the crash bar behind which now needs replacing or straightening, i could get away with repairing the bumper and repainting it, it does need new clips and black spacers between bumper and rear wing but hopefully they wont cost to much, oh and a new no plate which i had a spare anyway, thanks for the that, this will make my job a little easier this morning, mick [ cambridge]
Time for bed said "Zebedee"

New2Zed
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Rear bumper removal

Post by New2Zed » Fri May 19, 2017 8:57 pm

Hi Flybobbie

Hope you see this post as I need to ask you a couple of questions.

I want to fit some rear parking sensors to my wife's E89 (a car with a list price of £35,000 and no parking sensors, only the Germans could get away with that one).

Obviously I need to remove the rear bumper and have been reading your post on the issue. I can't quite make out what your third photo is showing. I think it's of the boot lip so do you have to remove the trim there to get at any fasteners. Are the only fasteners all accessed from under the car as you suggest.

No doubt all will become clear when I tackle the job, just trying to gain as much knowledge as I can before I start.

Many thanks.
2014 Z4 2.0. (driven by her in doors cos she thinks she looks pretty in it).
Range Rover Evoque (toss up between one of these and an X4)
Alfa Brera (had it 10 years now and still love it to bits)

flybobbie
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Rear bumper removal

Post by flybobbie » Fri May 19, 2017 11:37 pm

Third pic shows how the bumper attaches between the tail lamps.
And should point out that you do need to remove the tail lights as they get in the way of pulling the bumper back.
Fasteners that need remove are the hex head ones under the bumper. The two screw where you see me poking with a screw driver (one each side) which can only be get at by removing the rear section of the wheel arches, three bolts each side.

To refit the two screws where you can see me using a screw driver I had to tape the screw to the end of the screw driver so as to guide it into the hole. All very fiddly.

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