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03-31-2017, 01:37 PM | #1 |
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ABS activated while turning and light braking (Z4MC)
Hi Guys,
Something odd is happening and I need help figuring it out. Here is the background: I have a Z4MC with OEM brakes except for carbotech pads. The pads were replaced last year and have about 5000 miles on them. My rotors are a bit used and probably almost ready to be changed (I can feel a 1mm lip). I just changed my rear tires a week ago, and not too long after that, my brake pad light came on. I know one of the brake pad sensor was installed improperly when they changed my pad and is now slightly rubbing on the rim according to my mechanic. I'm guessing this is the reason of the brake pad light coming on. Here is my issue: Ever since I've changed those tires, when I'm in a curve and pushing on the brakes, the ABS is triggered very easily. I never experienced that before and I feel this is not normal. This happens at medium brake pressure, turning left or right. In the straight line, ABS triggers with much much more brake pressure. Any idea of what could cause this ? |
03-31-2017, 04:18 PM | #2 |
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Normal.
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03-31-2017, 05:03 PM | #3 |
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Hmm ok but what changed ? I mean I ran it in the canyons a week before and it did not do that at the same brake pressure. It does it really early in the pedal travel. Actually, in the 3 years I've had that car, it is the first time I feel that, and I can feel that on a daily basis.
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03-31-2017, 05:08 PM | #4 |
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There you go.
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03-31-2017, 09:08 PM | #6 |
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What size tires did you install?
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03-31-2017, 09:40 PM | #7 | |
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Quote:
Fact is exacerbated by braking while turning, when weight is shifted up front and rear traction decreases. This DSC goes crazy and pumps the brakes on one of the wheels trying to regain traction.
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04-01-2017, 10:04 AM | #8 |
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Oh I see, so what you are saying is I should do a little burnout and call it a day right ? Haha.
Joking aside, that's kind of a safety issue to have that layer on new tires I think. For a minute I thought it could be a wheel speed sensing issue, the back tires being bigger than the front because of the difference is wear. |
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04-01-2017, 05:08 PM | #9 | |
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Quote:
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04-03-2017, 10:48 AM | #10 |
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Years ago I was in a local enthusiast tire center having some work done (fantastic place, ONLY did wheels and tires, nothing else). Was chatting with the owner while paying and he told me earlier in the day he had warned a youngish owner of a 911 to be careful about the mold release. Mr. 911 proceeded to do a massive burnout in the parking lot on his exit.
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05-02-2017, 03:44 PM | #13 |
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Have you put 500 miles on these? Any change?
If not, and +500 miles added, is the aspect ratio or width, different than what you had previously? Did you have any alignment work done (changes in toe, camber) when the tires were installed? |
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05-31-2017, 09:56 AM | #14 |
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I am having the same issue with my 2005 E85, it is not an M, but has the M Sport suspension. I thought it was tire related, but replaced the tires back in February and have put on well over 500 miles on the tires. Tire sizes are the same, I moved from the Michelin Pilot Sport A/S 3 to the Pilot Super Sports in the same tire size and the issue still exists. I am thinking it is not tire related given I am having the exact same symptoms as before. I have had an alignment done, bled the breaks, rotors and pads are fine, but still see the issue.
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