[DML] Re: Shimmy While Braking
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[DML] Re: Shimmy While Braking

I forgot to mention when installing the lug nuts they should be done 
in steps and alternated till the correct torque is reached. 
Overtightening and failing to alternate *could* cause a rotor to 
warp. I have never seen it happen on a Delorean, but I have seen it 
on other cars. Other common possible causes of shimmy:
bad tires
low tire pressure
rough road surface
looseness in the steering and/or suspension
bent parts in  the suspension and/or steering

Typically alignment is not an issue but should be checked after 
replacing any worn or bent parts. Again, shimmy is NOT a brake 
related problem unless it occurs as you apply the brakes. If it ONLY 
happens during braking then you still could have other problems 
besides a bad rotor. A good shop will go over everything to make 
sure the car is safe.
David Teitelbaum
vin 10757

--- In dmcnews@xxxxxxxxxxxxxxx, "Harold McElraft" <hmcelraft@...> 
> Actual warping of a brake rotor is rare. There is usually some 
> issue such as uneven ware or run out - most common - and is a 
place on 
> the rotor has worn thinner than the rest, for example. Other 
causes can 
> be pad material or other contaminates on the rotor. All these 
> are usually caused by defective system parts like a piston stuck 
> sticking in a wheel cylinder, leaks, grease, bad brake lines or 
> incorrect pads to name a few.
> Resurfacing the rotors (a cleanup cut or more, if necessary) will 
> likely solve your problem - however, if the system problem(s) that 
> caused the rotor damage is not repaired your pulsing will return.
> There is a high probability that there is a system problem that 
> caused rotor damage. I would check thoroughly all system functions 
> fix the faulty areas found, have the rotors turned by a 
> shop with a certified machinist (I have found that these rotors 
> very sensitive and require the correct attention - be sure they 
> removed from the hub before turned) and put on new pads.
> Harold McElraft - 3354
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