The invention relates to a shock absorber assembly of a suspension system of a vehicle. The invention provides a suspension system of a vehicle and shock absorber assembly (100) of said suspension system. The shock absorber assembly (100) comprises a top mount (4) and a jounce bumper (1). The jounce bumper (1) comprises a main body (2) manufactured in an elastic material and a fixing element (3) manufactured in a second material harder than the former. The jounce bumper (1) is removably attached to the top mount (4) through a movable retaining element (5) housed in the fixing element (3), retaining said fixing element (3) in the top mount (4) in a first locking position and releasing said jounce bumper (1) in a second unlocking position.