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When overhauling the rear brake assembly, master-cylinder and calliper, replacing as many of the wear and damage prone items as possible will simplify the reassembly and subsequent adjustments required to set up the brakes correctly.
Using the correct specification parts is a sensible approach as well as maintaining that nice original appearance.
You may wish to consider these rear brake related components, mechanical and cosmetic:

430011239
920011034
920151391
920811932
130701144
131591056
430101068
430151368
430201094
430261058
430271052
430281060
430591380
430591651
430781068
430951237
920221028
430201094P
MST333
920371710
921501340
921501505
140791105
320851386
410801245
410801388
430481068
430805120
430821173
550201488RZ
5502014886C
5502014886F
55020148886
920431507
920431508
921441819
921501340

Add as many items as you wish to the same shopping cart and still only pay the same single fixed price shipping cost.

Engine work to carry out? Pro-workshop gasket sealant 08CRAHLG120G; easy to apply and with pleasing results.

This component may have other applications within the Kawasaki model range, so please make sure you order the correct part number for your application.