Hello there
I am trying to clean and rebuilt the Master Cylinder on my 68.
There is a clip on the cylinder retaining the piston. But clip has no hear to use with a plier. I tried with some tips but no way. What can I do to remove it?

 

Redneck ingenuity. Use the tool of choice in removing clip.
Snap-ring pliers generally if loops on the ends. Some cheaper rings have notches on the ends and a scribe may be needed in prying out the end of snap ring.

 

No as I said there is no loops and I can't find a scribe. I will probably have to cut it in 2 with a small dremel blade.

 

A new AC Delco master is about 40 bucks. Unless you're going for originality, you're better off replacing it. You can rebuild yours, but if there's any pitting in the bore of the master, like what can happen if the car was sitting for a prolonged period of time, you could end up still having a poorly operating (internal leaking) master.

 

I cut the clip with a small Dremel tool.
Inside is quite nice although a bit dirty. You are right Master Cylinders are 30$ only (I only checked for repair kits so far at about the same price !)
Now I prefer to save the good ole part rather than replacing with an asian made part. Always the same story. I will clean it thoroughly and see how it comes. It was not leaking when installed...

 

Working now on the wheel cylinders. Again looking if they are worth being kept but they cost a few $. Anyway how do you open them? The rubber on the ends seems to have to be removed but how. Just pulling them out?

 

Wheel cylinders are a 'through-bore.'
After removing rubber boots/covers, push pistons out from bore.
Bores can be honed with brake cylinder hone. Use WD40 for lube. Clean bores with BrakKleen.
Replace piston seals on pistons, lube with a dab of petro jelly and assemble as taken apart.
Remove bleeder and coat threads with petro jelly for prevention of bypassing air when using vacuum pump on bleeder.

 

Thank you for this. The trick on using some jelly on the bleeders can be usefull.
It's just that I can't pull off the rubber covers. Will try again...

 

I finally opened both rear wheel cylinders. They are dirty but not in bad condition.
To take off the rubber covers, I used a large (about 8mm) plier and pried on the rubber, it just pops off.