Question about 1997 Pontiac Grand Prix

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When coming to a slow stop my car jerks back and forth. front rotors have been turned and back rotors have been replaced. it stopped for about a day no continues to ****

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It's possibly......

.....1st, out of parallel rotors.......They may need replacing ....not just resurfacing.

.......2nd, a bent hub....."the part the rotor sits on".

......3rd, a bent rim....... "try switching the rims and tires front to back.

.......4th, a bad belt in a tire(s)....."try switching the tires front to
back".

If it was smooth for a day after turning (resurfacing ) the rotors....I'd go with replacing the rotors first.
(use quality parts......not import China rotors)

Posted on Oct 05, 2009

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Posted on Jan 02, 2017

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Brakes make a whistle noise when applied and sometimes a low grown or grinding when coming to a slow stop or start.


A grinding or rumbling noise can also be symptoms of a wheel bearing or constant velocity joint in a driveshaft. A worn wheel bearing can also cause a 'whistling' sound (as can a worn CV joint).

A grinding noise with brakes is either worn pads causing metal to metal contact on the brake disk/rotor, or the brake backing plate catching on a spinning rotor ... or a loose/missing anti squeal brake shim (they stop the pads from rattling and vibrating).

However, as you say a mechanic has looked at the brakes and can't find anything wrong .. I think I would begin to suspect a wheel bearing or constant velocity joint on the driveshaft (front wheel drive cars).

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You might want to check the distributor. Take the cap off and check if there is play on the rotor shaft. It's only supposed to turn, but if there's play when moving it back and forth, better you replace the distributor now. The 2000-2004 Xterras have a bad distributor shaft and the throttle positioner sensor is on the shaft. Just FYI.

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Front brake rotors need to be turned and new pads. Adjust rear brakes. the front brakes are doing all of the stopping. (overheating the rotors, premature pad wear).

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Is it a pulsating feel and the car jerks back and forth. If so warped rotors.

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1 Answer

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Jerks coming to a stop as in engine jerks, or does it seem like the brakes are jerking. When you leave off the pedal does it stop jerking? If it does it is probably warped rotors. A lot of new cars have this problem, my theory is that the brake pads they are using are way too hard. They put way too much heat into the rotor and warp it. Of course the rotors are none too heavy either. I think it is all in an effort to reduce weight in the vehicle.

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It's likely one of the brake rotors has warped. It can be replaced or maybe "turned" to grind it even again. It's what the front brakes go against to stop when you apply brakes.

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Take the car back and have the tires re-balanced. Also have the front brake rotors checked to see if they are warped. If your front rotors are warped it will give you a shimmying effect when you apply the brakes coming to a stop. If they are warped you can either have them "turned" to bring them true again, but sometimes the rotors are inexpensive enough to just replace because even though you turn them there is a chance they will warp again in a few days.

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check balance of tires; if ok, have rotors refinished or replaced; most likely warped rotors if you can feel it in the brake pedal when braking

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Since the rotor isn't warped. Do you have grooves in the rotor? Are the pads evenly worn? You a bad front 4X4 C/V shaft will also cause this reaction.
I would just unplug the ABS fuse and it will bypass the system to regular old-fashioned brakes.

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