Does the car pull to one side?
If yes then could be sticky caliper piston.
If not then likely to be MC/ servo if you have servo....not a standard fitting in 4/4 CVH of that era, my 93 CVH was servo less .
I had an intermittent brake issue of slight pull to offside only noticeable in the wet..
I cleaned the calipers and that seemed to cure it.
