9 Pry shoes away from backing plate and lubricate hoe contact surfaces with a thin coating of Ben3ix or Delco brake lube or Lubriplate On rear wheels sparingly apply this same lubricant where rake cable contacts flange plate AUTION Be careful to keep lubricant off facngs 10 nstall brake drums Whenever working on front wakes lubricate and adjust wheel bearings In tall front and rear wheel and tire assemblies 11 kdjust all brakes and brake cables as outlined tnder Maintenance and Adjustments 12 horoughly test operation of brakes MA N CYLINDER Rem val fig 5 20 J a Fig 5 20 Main Cylinder Assembly Removal 1 1 isconnect hydraulic lines from outlet end of v ilinder 2 a emove pedal return spring 3 l emove the three retaining nuts and lockwashers l Ading main cylinder to dash wall 4 emove cylinder pedal assembly from car I DTE Considerable caution will be required c this point to prevent staining the car inte r r with brake fluid Protect floor mat seats e c with suitable cover It is further suggested 1 at the lines removed from the main cylinc or be capped if the wheel cylinders are to be r sturbed Discs embly 1 l emove push rod assembly from boot end of main rlinder 2 emove boot from end of main cylinder 3 Remove piston stop snap ring secondary cup and piston from main cylinder 4 Remove the primary cup spring valve assembly and valve seat 5 Remove filler plug from top of main cylinder Inspection 1 Wash all parts in clean alcohol Make sure that compensating port in main cylinder body and bleeder holes in piston are clean and open NOTE Before washing parts hands must be clean Do not wash hands in gasoline or fuel oil before cleaning parts Use soap and water to clean hands 2 Inspect cylinder bore to make sure it is smooth 3 Inspect primary and secondary cups valve and valve seat for damage or swelling Swelling of rubber parts is due to the use of improper brake fluid or washing parts in gasoline or kerosene NOTE The primary cup has a brass support ring vulcanized in its base to prevent it from imbedding in the bleeder holes during braking action 4 Check piston fit in cylinder bore fig 5 21 The clearance between piston and wall of the cylinder should be from 001 005 Fig 5 21 Checking main Cylinder Piston Fit Assembly fig 5 22 Whenever a hydraulic brake main cylinder is overhauled care must be taken to reassemble the valve and seat correctly Improper assembly of the check valve seat rubber washer will result in its distortion When the check valve seat is distorted there will be no check valve seal and there will be a loss of brake pedal travel also the pedal will have to be depressed or pumped one or more times before actual car braking occurs 1 Install valve seat valve assembly and spring into main cylinder 2 Dip primary cup into clean brake fluid and install into main cylinder with the flat side toward push rod end Make certain cup seats over end of spring