Finally got around to replacing the brake booster on the Spyder, which had been experiencing occasional loss of vacuum assist. When I pulled out the old one, I noticed the o-ring around the master cylinder was dry and flat. More than likely that was the cause. Unfortunately I can only blame myself for that, as I had replaced the master cylinder years ago while chasing a soft pedal issue (that too was my fault, as I had swapped the front calipers, making it impossible to completely bleed them.)
So, in effect, a simple mistake years ago caused me to replace almost all of my brake system. At least I know it’s in working order.
While I was doing the booster, I added an additional check valve back on the rubber line coming off the intake manifold, just to make sure boost wasn’t teaching the booster.
