Rolling road - split driveshaft boot and binding rear brakes reduce power on graph?

[powerandtorque]

Link no work

I think that it's meant to be this:

http://www.toolbits.org.uk/Files/71538/Img/21/T433100.jpg

I can't say that I generally find balljoints to be a problem - can be a little stubborn if they've rusted in place from not being removed in years, but generally speaking downwards pressure on the wishbone and pushing the hub inwards makes them pop out easily enough and crucially without damage.  It's rare that I need to resort to BFI using a balljoint splitter or similar.