Specification sheets rarely include this information.

Brillouin threshold depends quite strongly on the spectral width of the source, so is different for CW and modulated lasers.  For modulated lasers, the effective linewidth depends on the modulation format as well as the data rate.  Brillouin gain, Stokes shift and spectral line width depend on factors including fibre composition, temperature and strain induced by cabling or spooling, only some of which are under control of the fibre manufacturer.

Having said that, Corning do claim that SMF-28e+ fibre has 3 dB higher Brillouin threshold than  SMF-28e fibre, but don't provide details of the source used for their measurement.

There are publications which describe how to predict Brillouin and Raman coefficients from the dopant and refractive index profiles of the fibre, but I don't know how accurate they are.

If you have suitable test equipment it may be easier to measure the thresholds directly.  Is this an option for you?

http://www.corning.com/docs/opticalfiber/pi1463.pdf

If we don't have any test equipment, is there no possible way to find out the Raman and Brillouin thresholds ?

What do you know about the fibres?  What are the dopant and refractive index profiles?  Have you asked the fibre manufacturer if he has measured the thresholds?

There is more information in the presentation linked below, with formulae you can use to estimate the thresholds from fibre parameters such as effective area.

Note that Raman gain increases with germania content, so many fibres have higher gain and lower threshold than predicted from the gain spectrum for pure bulk silica and the effective area of the fibre.

Peak Brillouin gain and gain spectrum depend on the overlap between the optical and acoustic modes, and there is considerable variation with fibre design.  The Brillouin gain coefficients reported by Marc Nikles et. al, "Brillouin Gain Spectrum Characterization in Single-Mode Optical Fibers", p 1842, vol 15 no 10, J Lightwave Tech Oct 1997, range from 1.6e-11 to 3e-11 m/W, significantly less than the value of 5e-11 m/W for pure bulk silica.

Ruffin et. al, "Brillouin gain analysis for fibers with different refractive indices", p 3123, vol 30 no 23, Optics Letters, Dec 2005, addresses differences in overlap between acoustic and optical modes.

http://www.imedea.uib.es/~salvador/coms_optiques/addicional/agrawal/NLOF.pdf