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A bicycle disc brake caliper includes a housing configured to be rigidly fixed to a bicycle frame containing a pair of opposing brake pad assemblies configured to reside on opposite sides of a disc operatively associated therewith. At least one of the brake pad assemblies is advanced and retracted r

A bicycle disc brake caliper includes a housing configured to be rigidly fixed to a bicycle frame containing a pair of opposing brake pad assemblies configured to reside on opposite sides of a disc operatively associated therewith. At least one of the brake pad assemblies is advanced and retracted relative to the disc by a drive mechanism along an advancement axis to effect braking. A pad wear compensation apparatus is operatively associated with at least one of the brake pad assemblies to advance the brake pad assembly along the advancement axis as it wears. The pad wear compensation apparatus includes an adjustment knob attached to the housing for rotation about a rotation axis and fixed against axial movement. A rotary to linear linkage between the linked brake pad assembly and the knob provides axial advancement of the brake pad assembly relative to the housing upon axial rotation of the knob in a select direction to fix a select distance between the at least one linked brake pad assembly and the disc with the brake pad assembly retracted.

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A bicycle disc brake caliper includes a housing configured to be rigidly fixed to a bicycle frame containing a pair of opposing brake pad assemblies configured to reside on opposite sides of a disc operatively associated therewith. At least one of the brake pad assemblies is advanced and retracted r

A bicycle disc brake caliper includes a housing configured to be rigidly fixed to a bicycle frame containing a pair of opposing brake pad assemblies configured to reside on opposite sides of a disc operatively associated therewith. At least one of the brake pad assemblies is advanced and retracted relative to the disc by a drive mechanism along an advancement axis to effect braking. A pad wear compensation apparatus is operatively associated with at least one of the brake pad assemblies to advance the brake pad assembly along the advancement axis as it wears. The pad wear compensation apparatus includes an adjustment knob attached to the housing for rotation about a rotation axis and fixed against axial movement. A rotary to linear linkage between the linked brake pad assembly and the knob provides axial advancement of the brake pad assembly relative to the housing upon axial rotation of the knob in a select direction to fix a select distance between the at least one linked brake pad assembly and the disc with the brake pad assembly retracted. aged position wherein said locking mechanism is received in said opening and wherein said spring-loaded pin is biased in said engaging position. 8. The retractable safety cage of claim 1, wherein said adjustable guide bracket further comprises a guide extension having a plurality of openings therethrough, wherein said openings may receive bolts for rigidly attaching said adjustable guide bracket to said ladder or said wall. 9. The retractable safety cage of claim 8, wherein said slide housing further comprises a bushing therewithin to facilitate said sliding movement of said at least two main rails between said extended position and said retracted position. 10. The retractable safety cage of claim 1, wherein said counterbalance is a pretensioned spring device having a tension force tending to maintain said main rails in said extended position. 11. The retractable safety cage of claim 10, wherein said pre-tensioned force on said counterbalance is sufficient to maintain said retractable safety cage in said extended position. 12. The retractable safety cage of claim 1, wherein said retractable safety cane provides a safety perimeter around said ladder or said wall enclosing approximately 270 to 360 degrees when said retractable safety cage is in said extended position. 13. The retractable safety cage of claim 2, wherein said retractable safety cage does not project substantially below said slide housing when said retractable safety cage is in said retracted position. 14. A retractable removable safety cage for mounting on a wall or ladder comprising: (a) adjustable guide brackets further comprising a slide housing connected to a guide bracket extension for attachment to said ladder or wall; (b) at least two main rails having proximal ends and distal ends, wherein said at least two main rails are slideably received within said slide housing for sliding between a retracted position and an extended position; (c) a coupling foot further comprising a rail extension having a proximal end and a distal end wherein said distal end is affixed to a stop having a portion protruding outwardly from said rail extension, wherein said proximal end of said extension rail is open and fixedly receives a tab that extends longitudinally outwardly from said proximal end of said extension rail; (d) a locking mechanism for releasably locking said retractable removable safety cage in either said extended position or said retracted position, and allowing said at least two main rails to be completely removed from said adjustable guide brackets; (e) a counterbalance mounted to said adjustable guide bracket and connected to said foot that provides a bias force in the direction of said extended position; and (f) a fixed first periphery rail having a first end and a second end wherein said first end and said second end are connected to said proximal end of said main rails. 15. The retractable removable safety cage of claim 14, wherein said retractable removable safety cage further comprises a floating periphery rail having a first end and a second end wherein said first end and said second ends are slideably attached to said at least two main rails and wherein said floating periphery rail is connected to said first periphery rail with non-rigid connectors. 16. The retractable removable safety cage of claim 14, wherein said tabs of said foot are inserted into said distal end of said at least two main rails, thereby coupling said at least two main rails to said adjustable guide bracket. 17. The retractable removable safety cage of claim 16, wherein said tab comprises at least one longitudinally extending member having a length of approximately 2 to approximately 10 inches. 18. The retractable removable safety cage of claim 16, wherein said foot receives said distal end of said main rail so that as said main rail slides within said slide housing between said extended position and said retracted position, said foot and said main rail slide as one unit. 19