PSI for Motive Brake Bleeder?

[hans747]

Hey friends!

Quick question: what is the recommended PSI for a Motive power bleeder on a single-circuit system?

Here's the backstory:
My son and I are bringing a 1966 122s back from the dead. So far, we have:

• Replaced master cylinder
  Replaced fron calipers
  Replaced all rubber hoses
  Replaced front rotors
  Replaced brake pressure switch
  Replaced rear brake shoes
  Replaced rear brake cylinders

I was having a hell of a time bleeding the brakes, so I bought a Motive bleeder. The system is better, but it still needs one or two pedal pumps to build pressure.

[BlackBart]

I’ll be interested in the answer to this as well.

So where else could there be any air in the system? I’ve read about people “priming” or pre-bleeding a new MC. Is that necessary with these?

[scot850]

Been an awful long time since I had a 122S, and 123GT. Don't recall ever having any particular issue with bleeding brakes. If you have a brake booster then that may be your culprit. The diaphragm internally fails or splits.

Only issues I had were the booster, a stripped thread on a rear brake adjuster that blew out on me and then failing seals. Brakes were really good otherwise with excellent stopping.

Neil.