Here’s a few photos from one of the other master cylinders we have – in rather less good condition than the one used for the other writeup.
Taking a wider view:
This one came with a bonus bit that our other one lacked; the little metal tab that sits between the banjo and the master cylinder assembly:
The paint sure has seen better days:
Removing the reservoir tube showed that it was gunked up pretty well inside:
It also disgorged chunks like this:
Eww.
The paint came off with literally moments of rubbing with a scourer:
The O-ring was a sticky mess:
Pulling back the rubber boot…
…showed it was full of rubbish:
This isn’t looking promising:
Yep, even after using penetrant:
…we snapped a pair of circlip pliers trying to free the circlip:
After many more hours of soaking in penetrant then having a run through an ultrasonic cleaner, the circlip was freed to reveal:
Under the rubber boot lurked a fair bit of sticky mess:
It came off with a pick readily:
The mess inside was an interesting colour when you poked it with the pick, too:
The piston was stuck in the bore, so more penetrant and time in the ultrasonic cleaner ensued:
We’ll be interested to see whether this one ends up being usable. To to back to the regular rebuild guide, pick it up at part one or part two.