have you check your ball joins.
depends on when it shakes if it shakes when you put on the brakes-warped rotors otherwise it could be ball joints, steering joints, wheel bearings or even out of balance tires
There are no bearings in brakes, but the hub has large ball bearings
No
The power steering pump also provides power for the power brakes.
The brakes can squeak, the suspension can squeak, the steering can squeak, the wheel hub/bearings can squeak, have a trusted mechanic determine the source of the squeak.
Warped rotors or drums and also have the front end checked as well as bearings. Warped rotors being number one, if it's in the steering wheel. If it's more in the seat concentrate on the rear brakes system.
sound like you have "grabbing" brakes to me. i would check them for contamination and if they are then you will need new brakes and to replace all rubber components, and if your brakes are not contaminted i would start checking wheel bearings, warped rotor or drum, and the balance of your tires. i would check your rotor or drum first, that is most likely the cause
Its not your bearings you idiot its your brakes. Take it in and have them replaced.
worn out pad, warped rotor, broken brake caliper (or cracked drum, if drum brakes)
The power steering pump provides the pressure for the steering and brakes. Check the p.s. fluid.
check your wheel bearings
The Astro Van power steering and brakes work off the same pupm. Check the pump for fluid. If it's full and the brakes and steering still hard you must replace the pump