SEAT Workshop Service and Repair Manuals

Piston for rear brake caliper: removing and installing Special tools and workshop equipment required

t  Plastic wedge -U-30800-

t  Piston retraction tool -T20055- t  G 052 150 A2 Assembly paste t  filling/bleeding equipment bleeding bottle -SAT 1150- Removing

–  Remove the piston from the caliper by turning it left, with the retraction device -T20055- knob of the brake caliper.   Note! t  Insert the -T20055- piston retraction device in such a way that the collar -arrow- is in front of the piston. t  On fitting the pressure tool to the retraction device, the tabs must face outwards.

–  Extract the gasket ring with the -U-30800- installation wedge.   Note! Make sure the cylinder surface does not get damaged during disassembly. Installation –  Only clean the piston and seal surfaces with alcohol and then dry. –  Before fitting the piston and seal, apply a thin coating of G 052 150 A2 assembly paste. –  Fit seal to brake caliper.

–  Fit the outside sealing protective cover with sealing lip over the piston.

–  Insert the inside sealing lip into the groove of the cylinder using wedge -U-30800-.   Note! During this operation, the piston has to be supported in front of the brake caliper housing.

–  Screw in the piston by turning the -T20055- retraction device knob to the right.   Note! t  Insert the -T20055- piston retraction device so that the collar -arrow- rests on the brake caliper. t  On fitting the pressure tool to the retraction device, the tabs must face outwards. t  If the position of the piston is changed by using the piston retraction device or operating the brake pedal, the automatic readjustment of the caliper will be destroyed. –  Fit the brake pads. Bleed the brake caliper

–  Open the bleeding valve -arrow A- and fill the bleeding bottle of the -SAT 1150- filling/bleeding device with brake fluid until it comes out of the threaded hole (closing of the brake hose) free from air bubbles -arrow A-. Close the vent valve.   Note! For bleeding prior to assembly locate the caliper as shown in the illustration.