if they are drum brakes it could be that the drums friction surface has a defect on it and everytime the shoes hit it it pops or it could be a bad hold down or quieter spring in the drum itself
warped rotors
the brakes <--- note spelling
Driving through a cow pasture.
The friction caused by the brakes causes the car to decelerate. This negative acceleration, in turn, causes a force to be applied to all those in the car. This is the lurch you feel.
The brakes :)
Could be, the brake pad wear indicators, rust,
Pads loose in caliper? Anti-rattle clips not installed or installed incorrectly?
They are equipped with a "telltale" warning that shrieks when the brakes are applied, with the brake pads are too low and need replacing.
When there are any issues with your brakes it is best to take your car in to a certified mechanic. Brakes can knock for several reasons, including the calipers, brake pads, and bearings.
Most common cause would be a loose brake caliper mounting bolts.
low break fluid?
Friction between the brake pads and the wheel rim or disc creates the force that causes a bicycle to stop when its brakes are applied. This friction generates heat as the brake pads press against the wheel, gradually slowing down and eventually halting the rotation of the wheel.