Accession Number : AD0780818

Title :   Brake Fluid Vapor Lock Temperatures vs Equilibrium Reflux Boiling Points.

Descriptive Note : Final rept.,


Personal Author(s) : Jordan,Charles B. ; Jamison,Robert G.

Report Date : MAY 1974

Pagination or Media Count : 16

Abstract : Vapor lock temperatures (VLT) were determined on dry and humidified samples of all brake fluids listed on the Qualified Products List of Federal Specification VV-B-680, Brake Fluid Automotive, and compared to the equilibrium reflux boiling points (ERBP) of dry and humidified samples of the fluids. The VLT and ERBP of experimental brake fluids, including the new silicone fluids, were also compared. In general the dry VLT's were as much as 34F. lower than the dry ERBP's while the wet or humidified VLT's were within plus or minus 5F. of the wet ERBP's. Therefore, VLT requirements would provide a greater margin of safety than ERBP requirements. Repeatability was found to be plus or minus 2F. It is recommended that safety factors governing brake fluid performance be based on vapor lock temperatures rather than equilibrium reflux boiling points and that this recommendation be reflected in all brake fluid specifications. (Author)

Descriptors :   *Brake fluids, Performance(Engineering), Boiling point, Vapor lock, Temperature, Specifications

Subject Categories : Lubricants and Hydraulic Fluids

Distribution Statement : APPROVED FOR PUBLIC RELEASE