06-19-2018, 03:01 PM | #11 |
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06-19-2018, 03:14 PM | #12 |
Mugwump
Join Date: Oct 2003
Carmudgeonly Ride: E46 330i, Chevy Colorado, Tesla Model 3
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06-19-2018, 04:02 PM | #13 | |
Hello.
Join Date: Mar 2004
Carmudgeonly Ride: '09 X3, '11 328xiT, '11 135i C, '17 c2, '19 X5
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Quote:
Does it do it all the time / everytime, or only after they warm up? Does it matter how hard you press the brakes (does it get worse if you press harder or does it only start after a certain amount of pressure)? Any residual vibration not under braking?
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06-19-2018, 05:25 PM | #14 | |
Mugwump
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Quote:
Braking hard at high speed sucks, and makes me curse at my rotors. |
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06-19-2018, 05:41 PM | #15 |
Relic
Join Date: Oct 2003
Location: Bethesda, MD
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What brake pads are you using?
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06-19-2018, 06:32 PM | #16 |
Mugwump
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06-19-2018, 10:13 PM | #17 | |
There and back again
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Carmudgeonly Ride: 2003 BMW 325xiT; looking for a new fun car
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Quote:
A good re-bedding clears the problem up for a while, then it comes back. So definitely not warpage - just some sort of build-up on the rotors. |
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06-20-2018, 11:17 AM | #18 |
Alphanumeric
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Installed four new rotors and pads on the f10 535i at 49k miles. It was pulsing badly and the rotors were visibly rusty. I used Zimmermann rotors and I think Textar (OEM-equivalent) pads. After a few thousand miles, the pulsing is coming back.... To top it off, I'm feeling very slight pulsing on the Boxster (at 17k miles).
Could bad roads (braking on bumps e.g.) cause issues over time? I see a commonality among Rumatt, Terry and I and that's where we live and drive. I'm paranoid about holding down the brake pedal at a stop, will occasionally use hand brake or move car a bit to avoid hot spots. |
06-20-2018, 11:32 AM | #19 |
Mugwump
Join Date: Oct 2003
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I also have Zimmerman rotors.
My theory on the commonality is that we don't drive our cars every day. My theory is that the rotors get slightly rusty from rain / humidity, but not in the spot where the pads are resting on the rotors. Driving scrapes the rust off off the rest, but the rotor is never the same from that point forward. Should I do an experiment where I remove my brake pads every time I park the car? |
06-20-2018, 01:24 PM | #20 |
older fart than ZBB
Join Date: Oct 2003
Location: On the road again
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Double blind . . .you'll have to remove the rotors too
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