I had the Jegs electric boost and master cylinder kit installed on my 69 Camaro. Brake fluid is leaking from the seal around the top of the master cylinder. I’ve spoken to Jegs and they do not sale a replacement gasket. Does anyone know why the system is leaking so bad?

 

over filled?

 

The master cylinder fluid level has to be down about 3/8 inch from the top (at least) to make up for thermal expansion of the fluid.
Otherwise, even a good gasket will leak.