Help ! I changed the axles on my hybrid s11a v8 4 speed rr, on rocky mountain parabolics to rr 1986 axles engineered to keep the parabolics in place for originality , anyway the brake system on the s11a doesn't seem to be supplying enough pressure to give me full braking power . Q, will the servo have the push needed to operate the four discs ? this has been renewed, or will i have to replace this with say a 90 which i have , remembering this is a s11a bulkhead and has only a two pipe system , help!