Help with Master Cylinder - removal of piston assembly.

[43tutor]

I'm trying to rebuild the MC on my 72 Satellite Sebring Plus. The casting number for the MC is correct so I would like to keep the original part with the car instead of replacing the MC. Problem is I can't remove the piston assembly. The piston retaining ring is removed from the end. The service manual shows there should be a piston retainer screw inside the front bowl chamber. I did not find a screw inside the MC. See attached photos. There is tapped hole inside the MC and I can thread a #10-24 bolt into the hole about 1/4" deep. I've looked into the hole and it doesn't appear the retainer screw is broken off inside the hole. The piston assembly slides freely until it contacts some type of positive stop. How do I remove the piston assembly???

I'm completely rebuilding the entire brake system on the car. I don't think the braking system has add much attention over the year. The sludge I found inside the front calipers was horrible; I wonder what I'll find inside the MC piston assembly.

 

[bink220]

Some master cyl's have a small tab that holds the plunger inside the M/C. This tab is held in place a Phillips head screw and is located on the mounting surface of the M/C say about the 5 o'clock position. If that is there remove it and I have used small bursts of air blowing thru the rear ports of the M/C. CAUTION: cover the Master Cyl with rags/towels (stuff goes every where) and be careful which direction you point the M/C. Parts shoot out the end like a bullet. Good luck, Rick

 

[5.7 hemi]

I tried a moth ago to rebuild my dads mc, ran into the same problem, said screw it after messing with it and the book for 4 hours. Napa had one in stock, looked the same on the outside, bore was right and 30 bucks later, it was on my truck.....he went with a disc brake conversion on his e body.

 

[bigblock]

Even IF you "rebuild" it. The bore/piston will be larger than stock. Meaning the hydraulic ratio will be incorrect. Unless you get it sleeved. Send it to SSBC and let them do it right.