When the pedal is produced, the House guiding the diaphragm is reopened for the manifold, And so the pressure drops as well as the diaphragm falls back again. This pushes the deal with on the brake pad to the surface with the brake disk, clamping on the spinning rotor. https://donovangaslc.blogvivi.com/37667985/considerations-to-know-about-truck-brake-service