On Sat, 01 Nov 2014 11:04:59 -1000, Geoff Welsh
wrote:

micky wrote:
Brake pedal goes half-way to the floor, only the first time.
......
What's the problem?

Bad master cylinder?


that is indeed, the text-book symptom of a bad master cylinder.

GW
Given the recent history of the vehicle -IE- it's damage history, I'd
be looking at the brake on the damaged axle first. Clamp off the brake
flex hose to that wheel. Is the pedal highand firm? If not, look
elsewhere. If so, you know where to look. Brake hose clamps are
available at Harbor frioeght and many auto parts/tool suppliers at
reasonable cost. Some are little screw clamps, others are a vice-grips
with round rod jaws. Make your own by brazing a 1/4 inch long 1/4 or
5/16" diameter steerl rods to a 6 or 8 inch cheap vice grips.