The relative viscosities and densities for lithium bromide (LiBr) and sodium bromide (NaBr) were measured in dimethylsulfoxide (DMSO), water, and DMSO + water at temperatures from (25 to 45) degrees C. The estimated uncertainty of the measurements was +/- 0.003 for relative viscosities and +/- 0.0004 for densities. The data have been analyzed using the Jones-Dole equation. The Jones-Dole B-coefficients of these electrolytes were derived and the estimated uncertainty was +/- 0.002. The values of the B-coefficients indicated that the salts behave as structure makers in DMSO, while in H(2)O and DMSO + H(2)O mixtures, the B-coefficient values were less positive showing a weaker structure-making effect.