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#21 |
Mugwump
Join Date: Oct 2003
Carmudgeonly Ride: E46 330i, Chevy Colorado, Tesla Model 3
Location: NY
Posts: 17,475
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#22 | |
older fart than ZBB
Join Date: Oct 2003
Location: On the road again
Posts: 8,900
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Quote:
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2017 GMC Sierra 1500 SLE 2020 Fusion Titanium |
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#23 | |
Alphanumeric
Join Date: Aug 2005
Carmudgeonly Ride: 981S, 340i
Posts: 9,584
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Quote:
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#24 | |
There and back again
Join Date: Oct 2003
Carmudgeonly Ride: 2003 BMW 325xiT; looking for a new fun car
Location: New York
Posts: 2,939
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Quote:
![]() May have more to do with driving style - I'm probably the only person that ever reviewed soft-compound A048's on Tire Rack and listed my driving style as "relaxed". ![]() |
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#25 |
Mugwump
Join Date: Oct 2003
Carmudgeonly Ride: E46 330i, Chevy Colorado, Tesla Model 3
Location: NY
Posts: 17,475
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Is it just that we drive like old men? Never get them hot enough?
I may not be perfect at stop signs but I'm so obsessive about it that I refuse to believe that's the problem. If it is then no non-enthusiast would ever be able to drive a BMW without the brakes shaking the car to pieces. |
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#26 |
No more BMWs
Join Date: Apr 2005
Carmudgeonly Ride: Ram, MS3, CX-5, RX-8
Location: Glenwood, MD
Posts: 14,753
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Matt, there's nothing wrong with your calipers. At least, when I had the car there was nothing wrong with them. I've seen the stock BMW calipers go wrong, but usually it's when someone tries to grease the slide pins. And then the symptom is the brakes get hot because they aren't releasing fully.
When I had my ZHP I had the same problem with the brakes (occasional pulsation). I believe what causes it is not enough hard braking events. I never found a better cure than an occasional full-panic-braking stop from freeway speeds. The Mazdaspeed suffers from this occasionally as well. It is what it is. ![]() |
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#27 |
Mugwump
Join Date: Oct 2003
Carmudgeonly Ride: E46 330i, Chevy Colorado, Tesla Model 3
Location: NY
Posts: 17,475
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I swapped my old Hawk Performance pads on today and made a trip to Home Depot. I did a few hard stops but didn't bed them - theory being the goal is to scrap the hell out of the rotors, not create an optimal braking surface.
In gentle stops they seem fine but in hard stops they still pulse like a bitch. I'm going to leave them on for a few days while commuting to work and see what happens. |
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#28 |
Mugwump
Join Date: Oct 2003
Carmudgeonly Ride: E46 330i, Chevy Colorado, Tesla Model 3
Location: NY
Posts: 17,475
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I'm still failing here.
![]() Short version: Bedding with race pads took the rotors from awful (shaking the front end to pieces while braking) to very good. But it's not right, it's getting worse again, and I'm cranky. I'm now avoiding driving the car because the brakes are annoying. Long version Here's exactly what has taken place:
Unless someone has a better idea, I'm going to try the following things in this order
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#29 |
Relic
Join Date: Oct 2003
Location: Bethesda, MD
Posts: 12,458
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start over with new rotors and new pads
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2011 M3 2006 Sierra 2500HD 4WD LBZ/Allison 2004 X5 3.0i 6MT 1995 M3 S50B32 1990 325is 1989 M3 S54B32 Hers: 1989 325iX 1996 911 Turbo ![]() |
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#30 |
Mugwump
Join Date: Oct 2003
Carmudgeonly Ride: E46 330i, Chevy Colorado, Tesla Model 3
Location: NY
Posts: 17,475
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Right. But I started from new pads and rotors once already. Doing it again only makes sense if I think I did something wrong, and plan to do it differently this time.. Right?
What am I doing differently? Maybe I didn't bed them aggressively enough when they were new? I did bed them though. ![]() |
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Thread | Thread Starter | Forum | Replies | Last Post |
Brake Rotors.... | lip277 | Technical Superiority | 3 | 10-14-2008 10:01 PM |