Potential booster failure
I only had one diaphram fail, but that was enough. The MC rear seal leaked into the front section of the booster. This was a Ferrari booster, I believe a Girling, but I am no longer sure. I cleaned it out and could SEE

the rubber appeared fine, no cracking, or hardening. After reassembly, about 3 months later, the pedal became hard, then harder

. The Ferrari Girling discs, weren't great to begin with. Real STOPPING was nearly impossible

. Took it apaty again to find the still soft diaphram had a crack in the bottom of it where there still was some fluid

. As this was an expensive booster replace, since that time I have always washed out the brake fluid with Brake Clean spray. Sometimes, there is rust in there too

. I don't feel you can be too careful with any brake work on valuable cars

! Good enough, may not be good enough, and the final result may be disaster

.

Gordon Raymond