[DML] Re: Steering column vibration when braking

["jtrealtywebspannet" <jtrealty@xxxxxxxxxxxxx>]

I can see where you might get confused. I am not referring to off center run-out. I am referring to "in and out". Difficult to explain with words, a picture would help. You set a dial indicator against the face of the rotor (where the brake pads would touch) and measure how much run-out (movement) there is while rotating the rotor. This would cause the brake pads to move back and forth and that would translate into movement of the wheel and be carried up to the steering wheel. On the rear calipers it would make the brake pedal pulsate, not shake the steering wheel. The run-out can be of two varieties, warpage where both faces remain parellel and the other where the rotor varies in thickness and the faces are NOT parellel. Both can usually be corrected (if necessary) by doing a light surface cut of both rotor faces. A bad wheel bearing will usually show itself by vibration, roughness, and execessive play in the steering wheel. Remember, the shake is intensified by looseness in the front suspension and steering, not caused by it.
David Teitelbaum

The only "DUMB" question is the one never asked.

--- In dmcnews@xxxxxxxxxxxxxxx, "Welmoed" <welmoedj@...> wrote:
>
> Hi Dave,
> 
> A dumb question from a foreigner (different mother tongue).
> In one of the replies this is said
> "Measure the rotors for radial run-out".
> 
> I'm not sure if I interprete this correctly, but does it mean the rotor may not be centered correctly? If this is not true, what is the actual meaning of "run out" as it also can be a "defective" bearing.
> 
> Thanks for explaining this.
> 
> Welmoed.
> 
> 
> --- In dmcnews@xxxxxxxxxxxxxxx, "daveswingle2" <swingle_dmc@> wrote:
> >
> > The obvious omission to me is the bushings at the end of the sway bar. But I'll bet replacing the steering bushing will do wonders. Also check the u-joints in the lower steering column for slop. I've seen that in some surprisingly low-mile cars.
> >
> > It's also possible that new rotors are not cut straight. Stranger things have happened.
> >
> > Dave S
> >
> [moderator snip]
>




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