Threshold braking issues in the 3 - Mazda3 Forums : The #1 Mazda 3 Forum
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post #1 of 21 (permalink) Old 08-04-2014, 10:24 PM Thread Starter
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Threshold braking issues in the 3

I don't know if anyone else has had this problem, but I've ran into it with my old MZ3 and the current MS3.

You know when you're stopped at a red light and you mash the brake pedal all the way? Like really hard. Then you lift slightly (about .5") and the pedal returns but you can push back down and there is no resistance? You can just slap the pedal back and forth.

Well this happens occasionally during autocrosses where I dig real hard on the brakes, lightly lift as I turn-in (trail brake), but the full brake pressure is still on. The pedal just slaps back and forth and the car keeps slowing in ABS. The ability to modulate under heavy braking is completely gone.

Now I've adapted to this where it doesn't happen as often by using lighter pedal pressure but I know I'm losing time because I just can't attack the brakes like I have in other cars.
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post #2 of 21 (permalink) Old 08-04-2014, 10:50 PM
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Braking

Not sure if this relates, but sounds a little like "ice mode" suffered by some cars during autocross braking conditions.

My current MZ3 does not have ABS, but never had what you describe on my '08 MZ3 Hatch. But then, I don't brake much anyway.......

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post #3 of 21 (permalink) Old 08-05-2014, 11:09 AM
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Mine does this too. I notice it the most going into the stop box where I'm really bringing the car down. On course it's a rare occasion, but I definitely have the same issue. I wonder if it's an issue with the ABS, it engages and takes a second to realize 'wait he isn't pushing the brakes anymore.'

Can we legally disable ABS by removing the fuse? IIRC we can only disable it electronically, but what does that entail?


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post #4 of 21 (permalink) Old 08-05-2014, 11:58 AM
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fast or hard braking activates more "brake assist" or something of that nature.

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post #5 of 21 (permalink) Old 08-05-2014, 12:46 PM
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Originally Posted by dgross7 View Post
Can we legally disable ABS by removing the fuse? IIRC we can only disable it electronically, but what does that entail?
I'm not showing an allowance for ABS fuse removal either, at least in Street and Street Touring.

I'm not sure how involved it would be to disable it electronically but I imagine you need software to access and modify parameters within the ECM, perhaps ask Joe at Dynotronics and see if he has the ability to turn off the ABS and if he would be willing to do so. Off the shelf programmers have no such feature, probably because it's not commonly asked for and also there would be some inherent liability that would the company would not want to assume.
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post #6 of 21 (permalink) Old 08-05-2014, 12:50 PM
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Originally Posted by Adam3s View Post
I'm not showing an allowance for ABS fuse removal either, at least in Street and Street Touring.

I'm not sure how involved it would be to disable it electronically but I imagine you need software to access and modify parameters within the ECM, perhaps ask Joe at Dynotronics and see if he has the ability to turn off the ABS and if he would be willing to do so. Off the shelf programmers have no such feature, probably because it's not commonly asked for and also there would be some inherent liability that would the company would not want to assume.
I know on some vehicles, it was as simple as unplugging a wheel speed sensor. Of course, I think that causes the 3 to royally freak out...

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post #7 of 21 (permalink) Old 08-05-2014, 01:01 PM
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I know on some vehicles, it was as simple as unplugging a wheel speed sensor. Of course, I think that causes the 3 to royally freak out...
I hear ya, additionally there is no provision in the rule book stating it's ok to unplug wheel speed sensors.
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post #8 of 21 (permalink) Old 08-05-2014, 01:22 PM
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Remove the fuse. I don't believe that portion is under "sanction"

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post #9 of 21 (permalink) Old 08-05-2014, 09:35 PM Thread Starter
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13.9.G (street)
On cars without the ability to turn off electronic stability control and/
or traction control (ESC/TC) from the manufacturer, modifications to
defeat the ESC/TC are permitted. These modification are limited to
altering the inputs to the ESC/TC processor (e.g., removing fuses,
unplugging yaw or steering angle sensors, altering signals) and may
serve no other purpose. Any codes or error lights resulting from ESC/
TC modifications are permitted.


So you can only unplug the steering angle sensor to defeat traction control, and that's only if there is no way to electronically disable TC.

14.3.D (street touring)
Original equipment ABS braking systems may be electrically disabled but may not be removed or altered in any other way.


So if you can get at it from the OBD or you can magically turn it off on you car, you're stuck.
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post #10 of 21 (permalink) Old 08-05-2014, 09:51 PM
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Why not just unplug the ABS module?

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