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1989 Ford Taurus:
Vibration after Front Brakes Replaced

By
Alex Steele
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Question:

 

I have a 1989 Ford Taurus with 62,000 miles. When I apply the brakes at 30 mph and faster, I feel a strong vibration and the steering wheel shakes. I brought the car into my mechanic and he replaced the front and rear brakes. I still have the same problem. Any ideas?

 

Answer:

 

First of all, did your mechanic resurface the rotors and/or drums? If the answer is no, the answer is simple. Go back and have them resurfaced.

 

The reason behind machining brake rotors and drums is to leave them "turning true" with a flat, uniform surface for the brake linings (pads, shoes) to ride on. This is accomplished with the use of a brake lathe. The lathe, when used properly will turn the rotor or drum and cut a clean, new surface with the use of a hardened machining bit. Normally, this procedure will leave you with smooth and efficient braking, as opposed to a pulsating brake pedal, a shaking steering wheel or a vibration throughout the vehicle.

 

There are different opinions on brakes, depending on to whom you talk to. Some say, if you have no vibration or pulsation while braking, replace the linings and don't bother resurfacing. Others recommend resurfacing whenever replacing the brakes. Responsible technicians go with option two.

 

I've seen cases of linings being replaced without machining because braking was smooth at the time. Often, halfway through the new brakes a vibration develops and it ends up costing more time and money then if you did it right in the first place.

 

According to your description of the steering wheel shaking, your problem is up front. Presuming the rotors have been resurfaced, let's look at the other possible causes. Number one, the rotors may not have been resurfaced properly (improper mounting on the brake lathe). A rotor could be bent or cracked and cannot be resurfaced correctly. The rotors may be too thin (beyond specifications), and once you get them hot, they become warped and cause the symptoms all over again. I have even seen rotors with porous castings (bubbles in the metal) and no matter how many times resurfaced, they cause problems. The fix for all of the above is replacing the rotors.

 

Another possibility is a problem with one of the hub and bearing assemblies which the rotors mount to. It may be bent or out of whack from the last curb you kissed, and the rotor in turn wobbles right along with the hub. Also, a loose wheel bearing at the hub may give you a similar effect upon braking. This is not good. We're talking about a wheel flying off the car if the problem is ignored long enough.

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Comments:

Admin
10 Jun 2012, 14:59
Glad you got it straightened out. And thanks for getting back with us!
michael stouder
04 Jun 2012, 09:50
Hi again

I was going to warranty the rotors (Wagner) but O'Reilly's said they discontinued Wagner and went to Bosch.
It would take a week to get the parts. I had them turn the rotors, and replaced both front calipers, and problem is corrected.

Thanks

Mike
Admin
03 Jun 2012, 11:40
Hi Mike,

Did the problem begin after replacing everything, or did you replace trying to fix the problem?

Is the vibration felt in the steering wheel (up front), or in the seat of your pants (rear). You can apply the parking brake while driving. If you feel the vibration with the parking brake the rear drums are the source.

If the vibration is in the front, and axles and all suspension parts are tight, it may require an on-the-car brake lathe to compensate for hub and mounting surface irregularities.
mike stouder
28 May 2012, 18:46
I have a '98 Ford Taurus. I have replaced the brakes, rotors and drums on the rear. I have a shimmy or steering wheel shake when braking above 45 mph.
I have dial indicated the rotors .000-.002", the sliding pins are free and have lubed them with Ford silicone grease. There is no bearing noise and very little front vibration at 75 or lower.

Could the bearings be bad? I don't feel any looseness or noise when spinning.
What next?

Thanks
Mike

 

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