Brakes grab reallyyyy bad when cornering - Mustang Evolution

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Old 07-24-2013, 08:17 AM   #1
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Brakes grab reallyyyy bad when cornering

I got new tires put on yesterday and installed my barton 2 post bracket. I was driving normally around a right curve and got on the brakes, not very hard though, and I felt my brakes grab really hard on one side. Almost bad enough that it could probably cause an accident depending on who's driving the car (although I'll be the only one that ever drives it ). Any thoughts on this? I went with a wider tire but I'm sure that has nothing to do with it...maybe something else during the tire swap that they might have accidentally done?
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Old 07-24-2013, 11:54 AM   #2
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Nothing that the tire shop did. I've experienced it

---------- Post added at 11:54 AM ---------- Previous post was at 11:50 AM ----------

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Originally Posted by Twisted 13 View Post
Nothing that the tire shop did. I've experienced it
Sorry I hit send before finishing....
Anyways, it has happened to me on 3 different 5.0s maybe all of 3 times. All while the wheels wheels were not traveling in a straight line. I actually work at a dealership and have not been able to reproduce it purposely. Still working on a diagnosis if I come up with something I will let you know. However, my initial thought is that it seems to be a caliper applying extra pressure to one side almost as if the abs or traction control is getting a false reading. Anyone else have any clues or experience with this?
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Old 07-24-2013, 12:56 PM   #3
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I've had it happen once on my '12 and can't reproduce the circumstances or determine any cause. It's definitely something in the TC/SC/ABS system that got momentarily freaked out by something. It has not returned since.
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Old 07-24-2013, 01:00 PM   #4
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I could reproduce it every time after it first happened while going around a right curve.
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Old 07-24-2013, 01:37 PM   #5
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That's lucky if you can still do it. A reproducible fault with the tech aboard gets more traction for repair than some random glitch.

My incident was around a tight left turn.
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Old 07-25-2013, 08:33 AM   #6
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I'm with 5LHO, it's probably something in the advance track or in the EPAS. I've noticed that often times my brakes will pull to one side or the other when braking in a straight line, but it doesn't always pull to the left or to the right, it pulls which ever way it wants to.
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Old 07-25-2013, 09:39 AM   #7
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The pulling to the left or right is typical tramlining, something Mustang engineers haven't figured out a way 'round ever since going Macstrut in the late '70s. If you look at the angles of the front suspension arms and the tie rod ends you can see why this is happening. Wide, stiff tires and/or lowering make this issue a lot worse, enforcing the use of a bump steer kit, which is at best a partial solution. The S197 is much better in this dept. than previous generations but it's still an issue.

That said, the advancetrak etc. can be put on an data recorder by the dealer, if they're willing and if you can reproduce the fault at will, it'll reveal the culprit.

These systems are massively complicated these days and interact with engine management, the smart junction box and various other subsystems. Bizarre love triangles occur and can actually point away from the direct cause when things go wrong.
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Old 07-25-2013, 12:54 PM   #8
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I guess this is a hit and missed on these cars. I have 2013 also and autocross it once already couple of weeks ago and never experienced this bizarre behavior. I usually brake hard on straight and trail brake on some turns an it's always smooth as butter on a hot plate.

I have another one coming this weekend, we'll see if will show this time.
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Old 07-25-2013, 01:01 PM   #9
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tramlining only occurs when you have a variable road surface like truck ruts or a cambered surface. You'd never get much on a flat.
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Old 07-25-2013, 01:19 PM   #10
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Quote:
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tramlining only occurs when you have a variable road surface like truck ruts or a cambered surface. You'd never get much on a flat.
That make sense, the other lot I'm going next month has few off cambered turns. Maybe it will show up there, we'll see but hope it wouldn't show.
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