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A pair of engaging protrusions provided in a support member and a pair of engaging grooves provided in a back plate of a pad are engaged with each other, and the pad is capable of being displaced only in the axial direction of a rotor. Each engaging protrusion is composed of a rising section and a b

A pair of engaging protrusions provided in a support member and a pair of engaging grooves provided in a back plate of a pad are engaged with each other, and the pad is capable of being displaced only in the axial direction of a rotor. Each engaging protrusion is composed of a rising section and a bent section which is bent at the tip end of the rising section at a right angle. The rising section composes a brake torque bearing section, and the bent section composes a rotation preventing section of the pad. The pad is prevented from rattling with respect to the support member by first and second pad clips.

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A pair of engaging protrusions provided in a support member and a pair of engaging grooves provided in a back plate of a pad are engaged with each other, and the pad is capable of being displaced only in the axial direction of a rotor. Each engaging protrusion is composed of a rising section and a b

A pair of engaging protrusions provided in a support member and a pair of engaging grooves provided in a back plate of a pad are engaged with each other, and the pad is capable of being displaced only in the axial direction of a rotor. Each engaging protrusion is composed of a rising section and a bent section which is bent at the tip end of the rising section at a right angle. The rising section composes a brake torque bearing section, and the bent section composes a rotation preventing section of the pad. The pad is prevented from rattling with respect to the support member by first and second pad clips. t have built up in and adjacent to the well; mechanically agitating the well; and varying the location at which the gas is directed generally sidewardly in a manner to direct the gas generally sidewardly throughout substantially the entirety of the producing area. 2. A method as set forth in claim 1, wherein the gas is directed generally sidewardly at a pressure in the range of approximately 50 to 1000 psi above hydrostatic pressure. 3. A method as set forth in claim 2, wherein the gas is directed generally sidewardly at a volume rate of flow in the range of approximately 0.3 to 120 cubic feet per second. 4. A method as set forth in claim 1, wherein the gas is directed generally sidewardly at a volume rate of flow in the range of approximately 0.3 to 120 cubic feet per second. 5. A method as set forth in claim 1, including the step of providing a relief valve in the well having a setting to open when subjected to said preselected pressure and arranged when open to direct the gas generally sidewardly. 6. A method as set forth in claim 1, including the step of injecting cleaning chemicals into the well. 7. Apparatus for stimulating flow in a producing area of a well, comprising: a production string in the well for receiving liquid in the well, said production string extending to the producing area; a gas line extending to the producing area of the well for supplying gas; an outlet port in said production string for receiving gas from said gas line and directing the gas generally sidewardly in the producing area; a relief valve for controlling flow from the gas line to said port, said valve opening at a selected pressure applied thereto in said gas line; a gas supply for applying gas to the gas line at said selected pressure in sequential bursts to discharge the gas generally sidewardly through said port in sequential bursts effective to generate a shock wave for breaking up materials in and adjacent to the producing area of the well; and a mechanical agitator carried on said production string adjacent to said outlet port for mechanically agitating the well. 8. Apparatus as set forth in claim 7, wherein: said well includes inclined louvers in the producing area; and said port comprises an annular slot oriented at an incline to direct the gas toward the louvers at an incline substantially the same as the incline of the louvers. 9. In combination with a production string in a water well having a production zone and inclined louvers in the production zone: a supply of gas under pressure; a gas line extending from said supply to the production zone, said gas line being connected with the production string; an outlet port for directing gas generally sidewardly in the production zone, said port comprising an annular slot oriented at an incline to direct gas passing through said slot toward the louvers at an incline substantially the same as the incline of the louvers; a relief valve having an open position connecting said gas line with said port and a closed position blocking flow from said line to said port, said relief valve opening when gas in said line is applied to the valve at a selected pressure; and a control for applying gas from said supply to said line in sequential bursts at said selected pressure, thereby sequentially opening said relief valve to discharge the gas through said port in bursts effective to generate a shock wave for breaking up material build up in and adjacent to said production zone. 10. Apparatus as set forth in claim 9, including a mechanical agitator carried on said production string adjacent to said outlet port for mechanically agitating the well. 11. In combination with a production string in a water well having a production zone: a supply of gas under pressure; a gas line extending from said supply to the production zone, said gas line being connected with the production string; an outlet port for directing gas generally sidewardly in the production zone; a relief va