This recommended practice documents dimensional metric specifications for hydraulic brake system threaded ports and banjo bolts for the interconnection of major components in automotive hydraulic brake systems. Banjo blocks are not covered by this recommended practice. The purpose of this document is to recommended preferred metrically dimensioned components (including alternative choices). Some applications may require sizes or forms other than those shown herein@ and this document does not preclude such other details when they are required.
SAE J1291-1980 history
2011SAE J1291-2011 Automotive Hydraulic Brake System Metric Banjo Bolt Connections