Advice on Light Pulsation While Braking

[discgolf01]

Hey guys, looking for some advice on some pulsation I am feeling while light braking at highway speeds.

 

Normally, I would just assume it's the front brake rotors out of whack and replace them and the pads, but in this case, the pulsation/shaking I am feeling is not coming through the steering wheel like I've always felt before with rotor issues on other vehicles I've owned. This pulsation is felt through the seat/vehicle, nothing through the steering wheel.

 

As mentioned, this occurs with light braking at speeds over 50mph and then dissipates the harder I brake.  Pulsation is light, most would probably not notice it, but I do since I've owned the truck since new.

 

Any thoughts on this? Might it just be the rear rotors having an issue since it's not being felt through the steering wheel?

 

Thanks!

 

2015 Sierra crew cab

5.3L

60k miles

[CamGTP]

If you feel it through the seat it's almost always the rear brakes.

 

The pedal or steering wheel would be fronts.

[discgolf01]

Great, thanks for info.  Had a feeling it might be just the rears, but have never had a vehicle where just the rear rotors go out of whack and not the fronts.  Anyway to 100% verify it's the rears without replacing them first?

[CamGTP]

A dial indicator would show you the run-out in the rotor, pretty much the only way to do that.

[MikeBMW]

On 11/14/2024 at 5:38 PM, discgolf01 said:

Great, thanks for info.  Had a feeling it might be just the rears, but have never had a vehicle where just the rear rotors go out of whack and not the fronts.  Anyway to 100% verify it's the rears without replacing them first?

I brought my car to the dealer and I wanted the front brakes done because of some wobbling.
They called me back and said fronts are fine but the rears needed attention.
Sometimes it's not what you think it is.