PowerFlex Control Arm Bushings gone bad. - BMW M5 Forum and M6 Forums
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post #1 of 7 Old 11th November 2017, 04:25 PM Thread Starter
Redleg9
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PowerFlex Control Arm Bushings gone bad.

The bushings in question are for the Front Control Arm (rearward) or Wishbone (item #2 on the attached drawing) I replaced the stock bushings in July 2016, then the car went into storage for 9 months. I drove the car a grand total of 6k miles before the bushings developed slack between the sleeve and the poly material.

Symptoms were similar to warped rotors under heavy braking, severe bumpsteer, inability to align the front suspension, and instability at higher speeds.

Warranty: PowerFlex offers a lifetime warranty. I contacted the retailer (WhyBee.com from the UK) and they immediately setup the claim. Two or three days later there was a new set of bushings in the mail on their dime (or pound, whatever). I have not received the new bushings yet, but the tracking shows they are somewhere out of customs heading to Kansas.

Warning: The part number I originally purchased appears to have been superseded (PFF5-702), yet lots of retailers still sell the bushings. PowerFlex shipped out a different part number, PFF5-1002, as the replacement. I have yet to find a retailer that lists the new part number as fit for the E60 chassis.

I will update this thread once I've had a chance to install the new bushings.

https://imgur.com/tqqAauP

https://imgur.com/NvjwUIQ

https://imgur.com/PEc1Xk3

https://imgur.com/JoJ1Ibq
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post #2 of 7 Old 13th November 2017, 02:58 PM
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Yes correct! They change it also at parts catalog!https://www.powerflex.co.uk/pdf/create.php?id=3237.

Also some retailers have wrong images!!
They send you back black series correct? Also you notice any deference from the OEM ?
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post #3 of 7 Old 13th November 2017, 03:12 PM Thread Starter
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Quote:
Originally Posted by Captainl View Post
Yes correct! They change it also at parts catalog!https://www.powerflex.co.uk/pdf/create.php?id=3237.

Also some retailers have wrong images!!
They send you back black series correct? Also you notice any deference from the OEM ?
PowerFlex has updated their catalog but retailers still have the old part number in stock. Anyone considering these bushings needs to be aware of that before buying. I haven't received the replacement bushings yet.

I can't say if the bushings by themselves made a huge difference in handling. I replaced the radius arm bushings with PBS poly bushings that same day. I didn't take pics of the other bushings, but they were in similar condition as the radius arm bushings as seen in the linked thread.
https://www.m5board.com/vbulletin/e60...-bushings.html

The combination, however, made the front end much more predictable at turn-in during spirited driving. It was quite uncontrollable and scary to drive at any speed above 60mph.
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post #4 of 7 Old 13th November 2017, 03:35 PM
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Great DIY!!!

Mine also have the same issues..... i need to change both of them!
Probably i follow your way
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post #5 of 7 Old 22nd May 2018, 07:53 PM
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Quote:
Originally Posted by Redleg9 View Post
PowerFlex has updated their catalog but retailers still have the old part number in stock. Anyone considering these bushings needs to be aware of that before buying. I haven't received the replacement bushings yet.

I can't say if the bushings by themselves made a huge difference in handling. I replaced the radius arm bushings with PBS poly bushings that same day. I didn't take pics of the other bushings, but they were in similar condition as the radius arm bushings as seen in the linked thread.
https://www.m5board.com/vbulletin/e60...-bushings.html

The combination, however, made the front end much more predictable at turn-in during spirited driving. It was quite uncontrollable and scary to drive at any speed above 60mph.
So just to confirm, you did poly bushes on both the control & thrust arms, and recommend the combo? Debating between doing just the control arms with mono, or going poly for both right now on my car!
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post #6 of 7 Old 22nd May 2018, 09:59 PM Thread Starter
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Originally Posted by T-RexM5 View Post
So just to confirm, you did poly bushes on both the control & thrust arms, and recommend the combo? Debating between doing just the control arms with mono, or going poly for both right now on my car!

Initially, I installed poly bushings on all four front control arms. The PowerFlex quickly worn out and had to be replaced. I installed OEM for a while until I decide my nextstep. Eventually, I decided to upgrade everything with Turner Monoballs. I installed all four bushing a few weeks ago and the results are fantastic. All of the suspension issues (creaks, clanks, clunks, squeaks, bumps, chimps, etc) are all gone. The car holds alignment much better (didn't at all before), and the ride did not suffer as much as I thought, even with coilers. I'd say, save your pennies (and some headaches) and go for monoballs right away.
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post #7 of 7 Old 22nd May 2018, 10:18 PM
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Quote:
Originally Posted by Redleg9 View Post
Initially, I installed poly bushings on all four front control arms. The PowerFlex quickly worn out and had to be replaced. I installed OEM for a while until I decide my nextstep. Eventually, I decided to upgrade everything with Turner Monoballs. I installed all four bushing a few weeks ago and the results are fantastic. All of the suspension issues (creaks, clanks, clunks, squeaks, bumps, chimps, etc) are all gone. The car holds alignment much better (didn't at all before), and the ride did not suffer as much as I thought, even with coilers. I'd say, save your pennies (and some headaches) and go for monoballs right away.
Thanks, that is great to know. Too bad those Monoballs are so damn expensive...
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