My brake pedal goes to the floor at the most inopportune times. I have made two runs on my new setup and can't figure this out. I have bled them twice personally, once having a friend depress the pedal for me while I do the bleeders and once with a hand held vacuum pump. I have had two different brake shops bleed and check adjustments on everything.
I have a Scout 44 rear with all new brake parts including wheel cylinders. Front 44 uses '76 FSJ calipers (new). After the first go around with a brake shop last week, the manager pointed out some discoloration (not wet) on the power booster and said my MC was leaking. I bought new MC (not remanufactured), put it on, bench bled it, bled brakes with vac pump; didn't cure problem.
That's when I took it to a different brake shop; $55 bones to them to flush bleed and adjust, and on this weekend's run same problem.
Brakes work great, pedal is stiff, and I'm a grinning cuz I'm a Jeepn', and then out of nowhere the pedal goes to the floor. One or two pumps, and the pedal is back to being stiff and brakes are working great. I don't get it. No signs of leakage anywhere, wheel cylinders, calipers, nada. MC is full. Can air be pulled in around a fitting but fluid can't escape out? Maybe the MC is bad?
Only parts I haven't replaced were the power booster and proportioning valve.
Thanks for the read, I know it's long.
82 CJ, some stuff stock, some stuff not
Have you hugged your Jeep today?