Over the course of the last several days, on my latest acquisition I have replaced the following:
The front upper and lower spring pads were re-used, the rear upper spring pads were re-used, and I put thicker (5mm) pads - also used - under the rear springs.
We gave up trying to get the collar nut out of the passenger strut housing since it was rusted fast to it. My buddy's car is on stands in his garage getting a swap, so we used the passenger strut housing he happened to have available. On the initial test drive I noticed a popping noise coming from the passenger front under braking, so my thinking was a bad wheel bearing in his strut and we would replace it with mine once I got the collar nut out of it.
I got the collar nut out Monday at another friend's shop and set out to do the strut replacement last night. After swapping struts the popping noise is still there on the passenger front, although now it seems to be a little less pronounced in the front than it was previously, and it sounds like it's also coming from the driver side rear.
Under gentle braking the noise is imperceptible. The harder I brake, the more pronounced the popping noise is, and the more vibration I feel in the steering wheel. We have checked and rechecked to ensure everything is tight and secure. The outer ball joints appear to be okay (no play using the 12 and 6 shake test), though the sway bar links and CABs could probably stand to be replaced. The frequency of the popping is greater than once per wheel/tire revolution, so I'd like to think I can rule out the rotors/pads/wheels/spacers/studs. The studs and lugs are torqued as tightly as I dare until I am ready to Loctite the studs into the hubs.
I spent about an hour searching for "popping noise," though out of the dozen or so threads I read in their entirety, none specifically mentioned the issue under braking and/or it increasing with more brake pressure. Any suggestions on what else to look for or check would be most appreciated.
Cliffs:
New and used parts installed, some worn parts that should probably be replaced have not been (yet), new popping noises emanating from front and rear under braking. Noise and chassis vibrations increase accordingly with the amount of brake pressure used.
- new Brembo blanks at all four corners
- new Hawk HPS pads front and rear
- new H&R Race springs at all four corners
- new Bilstein Sports at all four corners
- new Bimmerworld "Lifetime" RSMs; new RSM gaskets
- new Bimmerworld rear shock tower reinforcement plates
- pre-owned RUFF camber plates that I purchased from a forum member
- pre-owned Borbet Type Cs (that I refinished) with serviceable Nitto Neogens - tires were re-mounted and balanced with new stems at Discount Tire
- pre-owned 20mm spacers (which are not on the rears until I can get the fenders rolled)
- new 90mm studs and lugs from Motorsport Hardware
The front upper and lower spring pads were re-used, the rear upper spring pads were re-used, and I put thicker (5mm) pads - also used - under the rear springs.
We gave up trying to get the collar nut out of the passenger strut housing since it was rusted fast to it. My buddy's car is on stands in his garage getting a swap, so we used the passenger strut housing he happened to have available. On the initial test drive I noticed a popping noise coming from the passenger front under braking, so my thinking was a bad wheel bearing in his strut and we would replace it with mine once I got the collar nut out of it.
I got the collar nut out Monday at another friend's shop and set out to do the strut replacement last night. After swapping struts the popping noise is still there on the passenger front, although now it seems to be a little less pronounced in the front than it was previously, and it sounds like it's also coming from the driver side rear.
Under gentle braking the noise is imperceptible. The harder I brake, the more pronounced the popping noise is, and the more vibration I feel in the steering wheel. We have checked and rechecked to ensure everything is tight and secure. The outer ball joints appear to be okay (no play using the 12 and 6 shake test), though the sway bar links and CABs could probably stand to be replaced. The frequency of the popping is greater than once per wheel/tire revolution, so I'd like to think I can rule out the rotors/pads/wheels/spacers/studs. The studs and lugs are torqued as tightly as I dare until I am ready to Loctite the studs into the hubs.
I spent about an hour searching for "popping noise," though out of the dozen or so threads I read in their entirety, none specifically mentioned the issue under braking and/or it increasing with more brake pressure. Any suggestions on what else to look for or check would be most appreciated.
Cliffs:
New and used parts installed, some worn parts that should probably be replaced have not been (yet), new popping noises emanating from front and rear under braking. Noise and chassis vibrations increase accordingly with the amount of brake pressure used.
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