Vibration My Envoy vibrates when standing but turned in the drive speed stepping on the brake pedal, when it is high or red light

Struts would not cause vibration problems, A CV joint could, turn your vehicle in a parking lot hard right, make a circle than turn left make a circle ,if you hear a noises you have a cv joint problem. If you feel vibration on the steering wheel its in the front, if you feel it in the seat its in the rear.
Tires out of round & Balance very common as well brake rotors cause vibrations.

possibly a bad u-joint. Sometimes a u joint will feel ok but if it is too tight it can cause a vibration. you will need to remove the shaft to feel if a joint is too tight and binding. Or you have a tire out of balance. Usually a driveline vibration is more of a buzzing high frequency type of vibration the kind that puts your foot to sleep and a tire is more of a wheel speed vibration which is a lower frequency vibration.

How about motor mounts.

How hard are you stepping on the brake pedal? What you are describing sounds like the ABS system activating. When you step on the pedal hard enough to engage the ABS the light will come on, in some cars it will blink. You will also feel the thumping/vibration in the pedal since the system works by repeatedly engaging and disengaging the brakes. If it is happening when you step lightly on the brakes then you may have a bad wheel speed sensor or possibly a bad or miss-adjusted brake switch.

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

the brakes vibrating could mean a rough spot on the disc, a warped disc or faulty ABS.

Absolutely; wasn't positive until you mentioned the 'hum'. Bad bearings first warning sign is usually the humming noise before the vibration but since you have both, I'd be shocked if it weren't the bearinig, especially since you've got new rotors. In the past, a badly turned or warped rotor would mimic a bad bearing. Best of luck.
Greg

I had a similar problem. The dealer change automatic transmission and differential, but the noise continu. After research on internet i think the problem is the front galiper who create a vibration on the disc wheel and the vibration frequence follow the front axle until interior car. Just press slowly the brake pedal and if the noise stop , that's it the cause i think. I dont change my galiper, but i have a new transmission . :)))

hello have u rotated the tires front to rear then drive and see if u still have the noise and vibration if drive yes while driving slowely turn the steering wheel left to right just a small amount if the noise changes its probably a front wheel bearing if that doesn.t help drive the truck till you get the vibration then let up on the gas pedal does the noise go away if so you might have a bad u_joint but do the tires first how many miles???????

Maybe it's the transmission itself. check it.