2005 volvo xc90

It's STRUGGLE to get up to speeds ??

Mine is the same. Feels like a stuck caliper wong accelerate heats up the wheel etc. Its not the hose nor the caliper. The aluminum block in the abs unit that directs the fluid to all four wheels also has 8 check valves inside. 2 per wheel. One of them allowes fluid to go to the caliper the other to come out. Those valves are the only metallic parts in the abs hydraulic block. If your brake fluid wasnt changed around every 3 years, the dark tint lkke honey is the check valves rusting. When your brake caliper gets stuck on hard, crack the corresponding line at the abs unit. If under pressure... get a good one and replace