My brakes were shaking when I pressed the pedal so I decided to change the discs, pads, and the drums and shoes and wheel cylinders all at once. I bought the parts but didn't have the time to install them for a couple of months. Then, my brake pedal started sinking when I was at stop lights. My car would creep forward because the pressure was going.
So, I changed the discs, pads, wheel cylinders and shoes thinking that the wheel cylinders were leaking. It didn't fix the sinking pedal problem but the pedal didn't shake anymore.
Then, I got a set of Goodridge stainless steel brake lines... thinking one of the lines were leaking. I replaced them. Just so you know, don't use the Goodridge clips. They are cheap. Keep the Honda OEM clips (they hold the ends of the brake lines to the body) because they are stronger and reuse them. After installing them, I noticed that none of the oldbrake lines were leaking and I still had the sinking pedal problem.
I then ordered a master brake cylinder. After installing that, the sinking pedal problem is gone.
Woo hoo. If your brake pedal sinks after a couple seconds after you have depressed the brake pedal and held it, change the brake master cylinder.

Bad news, I stripped the nut on one of the bleed screws on a new wheel cylinder. Yeah, that was dumb on my part.

If you have any brake questions for a stock 95 Civic LX without ABS and rear drums, ask me.

 

flipped the seal on the MC....yeah, I've done that twice on a civic...congrads of a long and painful brake job finally done.