Most likely, this sound is coming from a vacuum leak in your brake servo, or brake booster. Which are usually located on the firewall, the wall that divides your engine compartment and cab.
Possibly nothing more than the brake pedal return spring catching on something.
Mine did that I replaced the abs sensor.
it is when u turn the tires lift the hit the ground
Replace your brake booster.As it sounds like it is leaking. Costs about 150.00 and relativly easy to install.
ball joints
A bad tire or a bad wheel bearing.
brake booster could be bad the seal around the rod that hooks to the brake pedal is leaking
bad master cylinder
cheack your break booster.
brake shoes or pads are worn and need replacing
More than likely the ratchet mechanism that causes the brake pedal to lock down is broken, perhaps due to a broken or disconnected spring. The "weird sound" could be the remainder of the mechanism brushing against the teeth where it would normally lock.