master cylinder leak

[John O.]

Hi All

I have a master cylinder I just rebuilt for my 62 vette. The problem i'm having is a tiny leak at the bottom of where the large threaded end that holds the guts in. The large copper washer is smooth when I installed it. It still has a tiny leak. I tried the steel washer that came in the kit. Still has leak. I looked over the entire end and can't see or feel any imperfection. Is there something I could put on the threads that would seal it? Or should I not put anything on the threads? Any suggestions? Anyone know where I can buy a new copper washer? I saw in the corvette central book that they sell one, but it is for 53- 60 only.Wouldn't that also fit 61 - 62 ? I feel the copper would be better cause it's softer and thats what came with the master cylinder when I bought it.

Thanks...........John

[Rob Dame]

Re: master cylinder leak

When i rebuilt the one for a 56 i had the same leak. I gave the nut a couple of very quick zaps with an air gun. That fixed the leak. Rob

[Pierre J.]

Re: 1972 Corvette Master Cylinder

John,
Also had the same problem with the copper washers on the M/C of my '56. I covered all the copper washers with a small coat of liquid teflon before install and the problem was fixed.

Pierre

[John O.]

Re: 1972 Corvette Master Cylinder

THanks Rob and Pierre

I'll try tightening it more first, then the liquid teflon if that does not work.

Thanks again..................John