Help! My car veers off the road under medium-hard braking

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May 19, 2002 | 12:14 AM
  #1  
Sometimes, when I press the brake with a medium-to-hard pressure, the car nearly veers off the road... it's getting to be a challenge to control it when this happens.

I had a mild case of this problem when I first bought the car... the front brake hoses were replaced and the problem went away. Now, in the more extreme case that I'm currently experiencing, I'm not sure what the issue might be. If I let go of the wheel while driving normally, the car is as straight as an arrow... it only seems to have problems when I hit the brake relatively hard.

I already checked my tire pressure and set everything at 32-33 psi. I don't know very much about suspension - would I need new shocks or something? I am going to need new tires soon, but I'm not sure if low tread could really cause a car to do that.

Thanks a lot guys, I'm kinda frightened to drive my car under these conditions .
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May 19, 2002 | 04:07 AM
  #2  
Causes of pulling steering under braking conditions: a badly wore rotor (grooved and pitted), a sticking caliper, oil or contaminant on brake pads (on one side only, could be that tire dressing stuff ), plugged brake hose (this happened to me, same symptoms you described) wore steering components. But usually a pulling condition is caused by one side having stronger or 'grabbier' brakes than the other side, causing the car to jerk to the side with the offending brakes.
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Feb 7, 2012 | 03:12 PM
  #3  
Re: Help! My car veers off the road under medium-hard braking

Hi everyone! I have a question for you! I am having a similar problem as the lady in the first thread of this discussion board so I figured this would be a great place to start. OK then, here's my question:

The harder I hit the brakes the faster it veers to the right (I could easily brake enough where the car ends up in the next lane over...and that's with me controlling the wheel quite a bit and only doing about 50mph). I replaced the front brakes, rotors and calipers with new ones and am still having the same problem so I'm wondering how I should go about checking for a plugged line and how will I know if the line is actually clogged? Couldn't an idler arm effect my car in a similar way? Is there any easy way to check the arm without pulling it? I have a 90' Formula. Thanks in advanced guys [and/or ladies!
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Feb 7, 2012 | 03:24 PM
  #4  
Re: Help! My car veers off the road under medium-hard braking
purchase new rubber brake hoses up front, bleed the brakes well and check that the caliper even new is not sticking
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Feb 7, 2012 | 03:58 PM
  #5  
Re: Help! My car veers off the road under medium-hard braking
blue86iroc - If you pull to the right, you either have a weak braking condition on the left or an overly strong one on the right. Weak conditions would be; air in the system, hose swelling up or leaking, malfunctioning caliper, worn pads or rotor (or both), oil or other contaminant on rotor/pad. You should check all of them by visually watching the hoses as someone brakes with the vehicle started, and pulling the wheels off to inspect the rotors and pads for wear or contamination.

Strong conditions on one side can be caused by a sticking caliper or improperly bled system causing one side to brake harder than the other. If you have recently had the system opened up in anyway (like changing the calipers or hoses) I would bet it probably needs to be bled more. If you can't get hold of a power bleeder (actually quite common and easy to use) try jacking it up and bleeding it while raised on either side, and continue bleeding as you lower the car in increments.

jgordon42 - If you have a bad idler arm (or any front end component for that matter) it will usually show some sort of symptoms while driving also. Driving perfectly fine in all cases and veering while braking is almost always something to do with your brakes.

Old rubber hoses should be one of the first things replaced on your brake system when doing an overhaul, they would have been the first thing I suspected in a case of veering while braking, they are usually the cause when it is beyond a simple worn rotor or pads on one side (which is usually caused by old brake lines also). I would replace them with stainless steel lines, even for just a daily driver car, for longevity and more positive braking feel. In the end it is your choice, and the rubber ones work fine. Make sure it is bled completely before buying the whole parts store though, lol.
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Feb 9, 2012 | 12:52 AM
  #6  
Re: Help! My car veers off the road under medium-hard braking
I've had this problem the whole time I've owned my car. I've replaced all the calipers, the master cylinder, the proportioning valve, the brake hoses, the center link and the idler arm. Nothings changed! I have no idea how this can be fixed, it may just be the way the car is?
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Feb 16, 2012 | 11:58 PM
  #7  
Re: Help! My car veers off the road under medium-hard braking
Had this problem before also and 2nd checking/replace the old rubber hoses on the brake lines. They start to collapse after a while.
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Feb 20, 2012 | 08:58 AM
  #8  
Re: Help! My car veers off the road under medium-hard braking
Hi, i had this problem and as a fluke through changing springs found one of my droplinks had snapped up front, this gave me a pull to the left in medium hard braking only. lived with it for a year before i found it, worth a look eh, droplinks cost nothing either.
regards
Anthony
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