never had to use lock tight on our competition car. but most road cars do use a lock tight, probably use red high strength locktight. blue locktight been standard.

we use a locking washer. wurth do a nord-lock washer which are really good.
shnorr washers work well too.

one thing to check is that all mating faces are free of paint. people think its a good idea to paint everything, heat from the brakes can coarse the paint to go soft leading to loose bolts

cheeRS
JIM