part of vesicle coat assembly synaptic vesicle coating biological_process GO:0016183 The formation of clathrin coated pits in the presynaptic membrane endocytic zone, triggered by the presence of high concentrations of synaptic vesicle components. This process leads to, but does not include budding of the membrane to form new vesicles. synaptic vesicle budding from presynaptic endocytic zone membrane