The invention relates to an electrical contactor intended to be connected to an electrical brake warning circuit and to be mounted with sealing engagement in an orifice (5) in a rear wall (1) of a pneumatic brake booster housing divided into a front chamber (3) and a rear chamber (4) intercommunicating selectively via a piston mechanism (2) movable from a rest position near the rear wall (1), the contactor comprising a plastic body with a first body part (6) intended to be engaged into the orifice (5) in the rear wall (1) and a second body part (7) remaining outside the housing and containing at least one pair of metal electrical contacts (20, 21) actuable by way of a follower (13) equipped with a head (14) and slidably mounted in a bore (11) of the first body part (6) and stressed by a spring (19) toward the outside of the first body part, so that its head normally bears against the piston means (2) in the vicinity of its rest position, the pair of contacts comprising a stationary contact blade (20) and a movable contact blade (21) stressed elastically away from the stationary contact blade (20) in the opposite direction to the direction of stressing of the follower (13) and coupled to a plunger (15). According to the invention, the plunger (15) is connected to the follower (13) by a one-way elastic engagement mechanism (26, 30; 107, 110; 202, 210).
展开▼
