activating lever 26 are fastened together by belleville washer 43 received in groove 55 on pin 52 and coil spring 15 extending between eye 57 in pin 52 and notch 41 on lever 26 dust boot 90 is provided to prevent entry of dirt into bore 25 by action of washer 43 and spring 15 tangs 28a and 28b are retained within locating holes 13a and 13b and toggle pin head 54 is urged into seating employment with shoulder 35 extending through housing bore 34 and into matting engagement with bore 31 is adjusting nut 42 having a coaxial threaded bore 44 internally therein adjusting nut 42 communicates with toggle pin 52 by projection 49 on nut 42 extending into abutting engagement with recess 56 within toggle pin head 54 adjusting screw 58 threadingly engages threaded bore 44 in adjusting nut 42 and includes flared head 60 which is attachingly received within cage 62 attached to inboard brake pad assembly 16 dust boot 92 is provided to prevent entry of dirt and contamination from entering bore 29 in housing 32 having described the parking brake activation elements the automatic adjusting elements will now be described positioned within intersecting bore 36 in abutting engagement with shoulder 37 is the adjusting mechanism foundation plate 76 plate 76 is provided with pivot post 78 post 78 may be provided by upsetting plate metal as shown to form the post by insertion of a roll pin or any other known technique adjustment pawl 66 is assembled on plate 76 as shown in fig8 a such that pivot post 78 is received in pivot hole 74 with dog leg 71 of pawl 66 extending through aperture 84 of plate 66 thereby.