Ate 893611021 Brake Master Cylinder (MC390057) fits AUDI 100, 100 Quatro 89-91 

Audi 100

year	vehicle attributes	Quantity	position	part description
1989		1
1990		1
1991		1

Audi 100 Quattro

year	vehicle attributes	Quantity	position	part description
1989	w/ Std. Brakes	1
1990	w/ Std. Brakes	1
1991	w/ Std. Brakes	1