90 Quattro 20V (Canada) L5-2309cc 2.3L DOHC (7A) (1989)
Slide dust cap onto piston
Fig. 4 Piston, installing
Lubricate piston and cylinder bore lightly with brake cylinder paste
Install piston and insert inner lip of dust boot into groove in brake cylinder
Fig. 5 Piston, installing
Press piston in as far as it will go
CAUTION: Outer lip of dust boot must slip into groove in piston.