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Message: <blockquote data-quote="yim1986" data-source="post: 362765" data-attributes="member: 16642">first, check your brake fluid, it is one of the source of the problem, if the brake fluid is expired, it will start to absorb moist, the moist will vaporize in the system during increasing of the system temperature, creating air inside the system which caused the bad responsive of the system. when it comes to moist, it will involved rust inside the system which will damage the oil seal, clogged brake hose...etcmy personal opinion, changing a brake master cylinder when your brake is spongy but there is no leakage in the system, it will be your master cylinder piston oil seal could not stand the fluid pressure and cause internal leak. the brake servo is not necessary to replace if it is still working, a twin servo is just multiply the driver braking effort more than single servo, it will improve the response but not the braking performance, like the size of the brake caliper,  provided if you change to bigger diameter brake disk and change to wider tires, the tire will be the first to improve if you want a better braking performance. hope my opinion and explanation help...cheers!</blockquote>