Proportion valve

yes, bore size is important. the smaller the bore, the more pressure and in turn more pedal travel but less pedal effort. the bigger the bore, the more volume and in turn less pedal travel but increased pedal effort. a 75 or 76 duster manual disc is what i think is the good one. i will have to check into it.

did i get it right or backwards? i am still amidst the first cup of joe.................