Recently I addressed the forum about the overly long pedal throw I found on my '60 BN7 after replacing the master cylinder (MC) with a like unit with a 5/8" piston, rebuilding the calipers and installing the Moss-sourced stainless steel mesh brake hoses. Bleeding the system twice didn't help. I have now installed the later MC with the 7/8" piston, a change Healey seems to have made to work with the servos used on most later cars. I reasoned that the 7/8" piston would move more brake fluid, shortening the pedal movement. I have received the hoped for benefit, minimal pedal movement before I get strong braking. I had on hand a Victoria British servo kit purchased earlier and chose this opportunity to install that along with the larger MC. This may make it harder to assess the benefit of the larger master cylinder, and I intend to block off the intake manifold hose to the servo at some point to get a sense for how much the servo contributes to the improved braking. While I have done a minimal amount of driving with the new system, most notable is how much the front of the car pulls down under hard braking. I didn't get that with the smaller MC. Unfortunately, I still get a sense that the left rear drum brake seems to lock up earlier and skid under hard braking. Possibly the right rear, further from my ears, is also doing that. I have checked out the drum brake mechanisms, and they appear correct. An additional note on the brake MCs. The push rod yoke on the small MC is fixed, meaning it has no adjustment. The larger TRW unit has a push rod that threads into the yoke and incorporating a locking nut. It also has a longer and more elaborate rubber piece that caps the rear of the MC. So, the TRW unit is adjustable at the pedal attachment point, and I found this enabled me to make that pedal position the same as with the clutch pedal. My clutch uses the small-diameter cylinder and has the unadjustable yoke connection. I am not advocating the use of servos, knowing that they can be troublesome. One of our club members removed his from a BJ8 and is perfectly happy. My daily driver is a Porsche 968 with four-pot brakes, however, and I am accustomed to really good brake performance, making the non-servo Healey braking a bit disconcerting at first blush.