1987 crappy brakes

[offroad powersports]

looking for a rebuild kit specifically for the 87-88 or new caliper mod setup . any help is appreciated. The J arm is hard to find parts 

[locogato11283]

RMATV has them..

Front - https://www.rockymountainatvmc.com/parts/all-balls-front-brake-master-cylinder-rebuild-kit-p?v=1685

Rear - https://www.rockymountainatvmc.com/parts/all-balls-rear-brake-caliper-rebuild-kit-p?v=1685

[smsurid]

Recently offered a 1987 2.9l model. The brake pedal could be very soft and she wouldnt forestall quickly enough in a crisis. Accumulators cost €350 each so i'm reluctant to buy. Would i need a couple of and has absolutely everyone accomplished the sort of job effectively?