Upuntil the mid 1980's there were two Australian manufacturers who vied for the local business. Girlock were probably more advanced in technology and ideas , PBR acquired the manufacturing business and Repco bought the Girlock Brake and Clutch service and parts outlets , turning them into Checkpoint and then swallowing them up into Repco Auto Parts. Thats a short and very brief explanation. The PBR brakes on commodores etc are actually of Girlock design.
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AU3 XR8 220 BLUEPRINT