Brakes poor brake performance diagnostics

California dreaming

soft brakes, pedal to the floor, pumping brakes.

Vapour lock.....when the brake fluid starts to boil with massive heat resulting in gas bubbles which are compressable. This could be caused by several things....excessive amounts of water in the brake fluid (brake fluid has a very undesirable property, it absorbs moisture from surrounding air (Hygroscopic) it HAS to be changed every two years regardless of mileage. Sticking seizing calipers....leading to over heating and vapour lock (as described above) Master cylinder seal failure: normally has the symptom of a slow progressive wander downwards of the pedal (pedal creep) as fluid forces it's way past the master cylinder. Total master cylinder failure where seals fold back on themselves (extremely rare) but can happen after vigourous brake bleeding where the old worn master cylinder seals have been forced over the worn ridge (where the seals would normally travel up to) during old fashioned pedal bleeding (working the brake pedal through it's full stroke)

flexi brake pipe ballooning: where the internal structure of the flexi pipes has been compromised causing fluid to escape into the outter layer of the flexi causing a 'balloon' to appear. Fluid leak: from rear wheel cylinders, front calipers or burst pipe...this would be permanent. Air in the system: would also be permanent.