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SAE J62 (APR1974)

Current Revision

Rubber Seals for Hydraulic Disc Brake Cylinders

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This specification describes the performance and part requirements for elastomeric seals used in highway vehicle disc brake calipers. Seals covered by this specification may be the solid section type (square, rectangular, O-ring, etc.) mounted stationary in the cylinder bore or on the movable piston. The specification contains the following major sections: 1 Resistance to Fluid at Elevated Temperature—Physical Stability (loose parts in 120 ±2°C (248 ±3.6°F) brake fluid for 70 h). 2 Resistance to Fluid at Elevated Temperature—Precipitation Characteristics (loose parts in 120 ±2°C (248 ±3.6°F) brake fluid for 70 h). 3 Resistance to Elevated Temperatures in Dry Air (loose parts in 175 ±2°C (347 ±3.6°F) air for 22 h). 4 Ambient Temperature Stroking Test (tested in brake assembly for 500,000 cycles to 7.0 ±0.3 MPa (1000 ±50 psi)). 5 High Temperature Stroking Test (tested in brake assembly for 70 h (70,000 strokes) at 120 ±2°C (248 ±3.6°F) to 7.0 ±0.3 MPa (1000 ±50 psi)). 6 Low Temperature Leakage Test (tested in brake assembly for 120 h at −40-42.8°C (−40-45°F)). 7 Cycling Humidity Storage Corrosion Test (tested in brake assembly for 14 days at 95% humidity cycling between 21-46°C (69.8-114.8°F)).

SDO SAE: SAE International
Document Number J62
Publication Date April 1, 1974
Language en - English
Page Count 4
Revision Level 197404
Supercedes
Committee
Publish Date Document Id Type View
April 1, 1974 J62_197404 Revision