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Thread: Electro master cylinder

  1. #1

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    Default Electro master cylinder

    Rebuilding a PA20 with dual electro cylinder brakes which had the parking brake pieces removed. Does anyone happen to have a close up pic of how the parking brake tabs work or is it common practice to remove the system?
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  2. #2

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    Default Re: Electro master cylinder

    Quite frankly you do not want any parking brake system that relies on binding of the shaft mechanically… better to use a hydraulic lock valve with cable operation…

    Brian

  3. #3

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    Default Re: Electro master cylinder

    If I get a chance tomorrow I’ll post pictures of the Electrol masters I took out of my PA-16.


    Sent from my iPad using Tapatalk

  4. #4
    Gilbert Pierce's Avatar
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    Default Re: Electro master cylinder

    I removed those tabs 25 years ago. Poor design in my opinion.

  5. #5

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    Default Re: Electro master cylinder

    I see your guys point- it's not a very reliable system design at best and at worst could bind up when you least want it to. A parker lever valve down stream of the hoof shuttle valves would seem like an improvement.

  6. #6
    Administrator Steve Pierce's Avatar
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    Default Re: Electro master cylinder

    If you haven't seen this previously here is a thread on the Electrol master cylinders with parts diagrams etc..

  7. #7
    Vagabondblues's Avatar
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    Default Re: Electro master cylinder

    Quote Originally Posted by Northernbc View Post
    I see your guys point- it's not a very reliable system design at best and at worst could bind up when you least want it to. A parker lever valve down stream of the hoof shuttle valves would seem like an improvement.
    I did a version of the lever operated hydraulic valve when I upgraded the master cylinders to new Groves. Could not find a simpler solution than the original spring operated levers when you incorporate the hoof valves.

    I have a set. What 50 pacer parts do you have for trade?

    Todd
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  8. #8
    Administrator Steve Pierce's Avatar
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    Default Re: Electro master cylinder

    What I don't like about them is they are a pain to service. Standing on you head, pulling up the tab against the spring trying to add fluid. I finally realized it was easier to remove the screw in the side and add fluid there.

  9. #9

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    Default Re: Electro master cylinder

    Your 337 drawing looks like a good solution Todd. Yes, with the Hoof shuttle valves the system is a little more complicated but it looks like I can do something similar to what you've done and mount a parking valve under the floor with a couple extra lines.

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