steering shaking on freeway

[pokwa]

I am having a problem for long time.When I was driving on freeway with the speed above 70mph and pressed the break pedal,the steering wheel started shaking.What is the real problem and how will I explain to my mechanic to be fixed?

 

[GorillaSooner]

On my previous vehicles when that happened it was time for new tires. I drove that vehicle mainly in the city, but when I went out on the highway 1 day I was shocked with how much the sterring wheel moved back and forth while I was driving over 60mph. I talked with someone about alignment, but was told it wasn't the alignment, I needed new tires. Presto, as soon as I changed the tires it went away. Happened again in my mother's car and a tire change did the trick there too. Not saying that's what is going on, just something to look at.

 

[GrantK]

Explain it to the service tech just like you did here.

It could be tires but since it involves brakes, it could also be a warped rotor.

 

[Ducmonsta]

Explain it to the service tech just like you did here.

It could be tires but since it involves brakes, it could also be a warped rotor.

Rotors are warped. Vibration during braking is 99% brake rotors. Very few instances where tires are the cause. Tire vibration will happen at several different speeds. Usually around 45-55 and then again at 80+.

 

[1engineer]

Rotors are warped. Vibration during braking is 99% brake rotors. Very few instances where tires are the cause. Tire vibration will happen at several different speeds. Usually around 45-55 and then again at 80+.

This.

 

[BensonTT]

The wheels could be off balance?