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Suspension & Braking Forum by BimmerWorld
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Old 04-07-2006, 01:37 AM   #21
Qshio3000
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Originally Posted by funkeycold
It's like a 2 second delay before it starts to grab well. Even if I hit the brakes hard it still has a second or so delay before it really kicks in.
Are you serious? At 60mph, two seconds equals 176 feet (88fps). That's more than half a football field at a relatively low speed. I'd get that sh#t checked out ASAP.
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Old 04-07-2006, 09:55 AM   #22
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Yeah, Qshio3000, I'm afraid he is serious. It's like this: you drive in the rain (say on the highway), step on the brakes, and for a moment nothing happens. When the pads are finally done wiping the water off the discs, deceleration ensues. It's pretty nerve wracking the first time, especially considering how powerful the brakes are in dry conditions.

Clearly there is something in the design of the bumper, underbody, wheels, etc., that promotes air/water flow towards the discs. This makes sense in a way, because in the dry, you want as much air as possible cooling the discs.

I'm not surprised that the Germans, with their autobahns, have noticed as well. Can you imagine the scare when you're tooling around at 130+mph? As mzarolinski hinted to, this is probably why the new 3 series (E90) has the brake pads move closer to the disc, when the wipers are activated, in an effort to dry out the discs.
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Old 04-07-2006, 10:11 AM   #23
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learn how to drive adaptively to the road conditions. you cant jam on brakes under all conditions and expect the same results.
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Old 04-07-2006, 10:17 AM   #24
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is this just normal driving? I notice that my brakes do that only when I go snorkeling with my car (unintentional wading through deep waters)
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Old 04-07-2006, 01:51 PM   #25
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This problem - wet & cold braking - depends on the pads. I had the OEM pads on my car and never had a problem. I switched to Axxis Metal Masters and now I have the problem. After talking with Mike Miller (BMWnsCCA tech guru) about this, he said that it's a combination of the pads and the rotors. Basically, the non-oem pads need heat to operate properly. Solution has 2 parts: anticipate traffic - look ahead of the car in front of you; occassionally depress the brake pedal for about 1 or 2 seconds to heat the pads.
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Old 06-21-2006, 04:02 PM   #26
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Hello Again...

does anybody of you know a case in which this problem has ended in an accident.

Here in germany it`s hard to get the evidence that an accident occured because of this problem...

Does anybody of you know such a case`?`?

If someone wants to get more information how many people in Germany have this problem too, please click here:

http://www.auto-treff.com/bmw/vb/sho...hreadid=149271

We are now about 64 people.

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Old 06-21-2006, 06:46 PM   #27
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I think this problem is really something that people have to live with.

I agree it does it less with OEM pads because of operating temps, and I also agree it will probably do it more on the more aggressive bumper design.

Its kind of a trade off, you want great braking power time after time you need more air to cool the braking system, water will come in the same place that the air is coming in, especially that low to the ground.

I know that this does not happen on all cars, I would be curious to see if it happens on say a porshe due to the large brake ducts.

THe E90 fixed this problem by periodically wiping the rotors clean when the windsheild wipers are on.

I know personally I do the same thing in heavy rain, I tap the brakes every once in a while just to keep them clean and dry for a stop or an emergency stop.
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Old 12-14-2009, 11:01 PM   #28
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I know this is an old thread, but imo this is a fairly serious problem.

Are you guys sure this is normal? My ZHP does this, and it is kind of scary because I probably would end up rear ending someone in the event of an emergency stop. There definitely should not be a 2 second delay before braking force is applied. No other car I've driven (including two other BMWs -- an E46 330xi and an E53 X5) does this.
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Old 12-14-2009, 11:56 PM   #29
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I've noticed this before in really heavy rain as well. I have to push the pedal harder to get the same amount of stopping power.

What really makes me wonder, is why BMW advertises their 'brake surface drying' technology, when it doesn't seem to work? You know, the one where the brake pad spins real close to the rotor during a rainstorm to keep them dry?
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Old 12-15-2009, 12:47 AM   #30
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chrisnetcom, how do you know the technology does not work? As far as I know, it's wasn't available on the E46 you're driving.

For what it's worth, when my rotors were due, I installed crossed-drilled ones for show and, over the course of a few rain storms, the problem seems to have largely gone away. I suppose the extra holes allow the water to exit the braking surface that much quicker. Then again, maybe it's just in my head.
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Old 12-15-2009, 01:21 AM   #31
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^Not in your head. Braking with drilled rotors seems to be more responsive under heavy raining. I also have the M3 bumper with the brake ducts, so all of the rain water goes straight to the rotors
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Old 12-15-2009, 02:19 AM   #32
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I've noticed this before in really heavy rain as well. I have to push the pedal harder to get the same amount of stopping power.

What really makes me wonder, is why BMW advertises their 'brake surface drying' technology, when it doesn't seem to work? You know, the one where the brake pad spins real close to the rotor during a rainstorm to keep them dry?
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Old 12-15-2009, 06:50 AM   #33
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Cross drilled is the solution. While they might not be the most durable, they will solve this problem. I do not have the problem on my ZHP, but, if I did, I would be installing cross drilled. Had another car that did that, the 1-2 second delay seems like a lifetime! Cross drilled fixed the problem and I never looked back.
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Old 12-15-2009, 11:53 AM   #34
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Would slotted rotors work too? I was planning on buying the Stoptech Stage2 kit from mod bargains, but they don't seem to offer drilled rotors.
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Old 12-15-2009, 10:47 PM   #35
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Would slotted rotors work too? I was planning on buying the Stoptech Stage2 kit from mod bargains, but they don't seem to offer drilled rotors.
We offer Drilled We have the Same Kit with Free Shipping

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Old 12-15-2009, 11:55 PM   #36
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Notb, you are indeed correct! The brake drying feature was introduced to the 3 series with the e90.
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Old 12-16-2009, 01:25 AM   #37
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We offer Drilled We have the Same Kit with Free Shipping

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Old 12-16-2009, 01:46 AM   #38
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I have the same problem too with my OEM blanks/OEM pads. It's probably only 1/2 a second but when travelling at speed, that abnormal feeling, feels like a lifetime.

After getting zimmerman/bremo drilled rotors matched with OEM pads, the problem has been helped a little but I still get that brief moment where the water on the cold/wet rotor needs to be cleared for maximum friction.

Maybe there is a combination that can defy that feeling? I just make sure I keep my distance on the highway. Off the highway I never have that pause of no brake friction.
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Old 12-16-2009, 01:49 AM   #39
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get that checked out man, not something you want to wait around for
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Old 12-16-2009, 10:02 AM   #40
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Seems that the common link is the M-Tech front bumper. I know this will get me in trouble eventually.
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