On the standard calipers the slide pins do exactly what they say - slide
The piston applies the pressure and pushes the inside pad against the disc and pulls the outer pad onto the disc as the side pins allow the caliper to float pulling it accross and the pad into contact.
the slide pins are what connect the calipers to the carriers, the caliper slides along the guide pins to tolerate imperfections in the disc and to prevent un-necessary contact between the pad and disc during suspension movement and cornering. think of it that the when the pads come into contact with the disc when the brake pedal is not pressed, the capliper simply slides out of the way and doesnt put any force on the disc or slow the car down.
when the brake pedal is pressed the piston on the inside comes out and presses the inside pad onto the disc and at the same time pulls the outside pad onto the disc
A forum community dedicated to Volkswagen Mark 4 owners and enthusiasts in the UK. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more for the Golf, Bora, Jetta, Touran, and Scirocco!