Replace the Power Steering pump.
You need the front rotors machined or replaced.
change the p/s pump. the pump helps the hydro booster with braking.
You rotors are warped and will need replaced/resurfaced.
You have a warped rotor. Brake pads need replacing and the rotors turned or replaced.
Probably warped brake rotors. They can be removed and resurfaced or replaced with new ones.
Be sure to check suspension components. Namely the tie-rods...
Brake boosters are found on car braking systems, to help the brakes to stop the car. They work on the disc brakes, using a vacuum supply to add to the hydraulic braking system. On petrol engines the engine may provide the vacuum, on diesel engines there needs to be a separate pump.
Chances are, if it's a passenger car or minivan, you have "rack and pinion steering". And if that's the case it means your rack is leaking badly. Get it replaced or it could become dangerous to your braking, and you could lose all steering.
My guess would be that you might have a bad brake hose to one of the front calipers.
A bad brake booster will cause a vacuum leak, result in poor braking, and even poor engine performance. The brake booster has a large diaphragm which can fail and leak.
Warped brake rotor. Have the rotors removed and trued or replaced. Replace the brake pads at the same time.
The type of brake system with vacum assist will have a large diameter hose from somewhere on the intake manifold to the brake booster. The type of brake system with hydro-boost will have hoses from the power steering pump to the brake booster.