I know the difference between the lenited sounds when the are before a vowel that causes them to be broad or slender but how do the react consonants ? Does this depend on the consonant or are they always pronounced the same. I know that Bhrid is used as the slender V sound here , is that always the case ? or does the Bh in Bhrid take the slender form becuase the first vowel after the consonant is one that would normally cuase slender lenition ??

hail hail

A chara,
when there is consonant+consonant+slender vowel, the first consonant is slender at the beginning of the word or if the preceding vowel is slender too, but it is broad if the preceding vowel is broad or is "e", ex. in "Gaeltacht" "l" is broad.
In West Galway the exception is "s" + slender labial consonant or "s"+"r"+ slender consonant, in which case the "r" is broad too.
Slán,
Davide