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  1. #1
    Join Date
    Mar 2009
    Location
    central Wisconsin
    Posts
    57

    Default difference between power and manual master cylinder

    What is the difference between a power master cylinder and a manual master cylinder?

    The reason I'm asking is I want to replace the single master cylinder on my Skylark with a lightweight plastic/alum. dual master cylinder off of a early 90's S-10 pick-up. Napa has a rebuilt one w/power for $60 less than the manual one. I've done this before on another car but used one for a manual application. Does anyone know if the power one will work for a manual application? Thanks in advance. Mike
    Master Effer-Upper and highly skilled in the art of unfabricating

  2. #2
    Join Date
    Mar 2002
    Location
    Sunny Seminole FL
    Posts
    14,754

    Default Re: difference between power and manual master cylinder

    I believe it will work.....in the older cars....I believe the bore was slightly larger on a manual master..... 1 1/8 vs 1" for power
    George Nenadovich
    Buick Performance Club Founder
    www.BuickPerformanceClub.com

  3. #3
    Join Date
    Feb 2004
    Location
    New Haven, CT
    Posts
    854

    Default Re: difference between power and manual master cylinder

    Quote Originally Posted by GStage1 View Post
    I believe it will work.....in the older cars....I believe the bore was slightly larger on a manual master..... 1 1/8 vs 1" for power
    Wouldn't it be the other way? Larger bore equals more force required from the pedal.

  4. #4
    Join Date
    Mar 2009
    Location
    central Wisconsin
    Posts
    57

    Default Re: difference between power and manual master cylinder

    That's what I thought also, but wasn't sure. Anybody else have any info on this? Thanks, Mike
    Master Effer-Upper and highly skilled in the art of unfabricating

  5. #5
    Join Date
    Jun 2005
    Location
    berkley, mass.
    Posts
    2,863

    Default Re: difference between power and manual master cylinder

    i do know that the cup in the piston is deeper in the manual one so the pushrod won't fall out. i did this conversion on my camaro and that was the main difference. as far as the bore size goes the larger one will push more volumn compared to the other pushing more pressure which i think you need the smaller one for pressure since there isn't any assist. i may have that backwards.
    paul c.
    65 skylark conv. 455/th400
    79 z28 w/a dart block and headed 555 bbc. hopefully 9.50
    2 jetskis
    mountain bikes and road bikes
    no more hobbies please

  6. #6
    Join Date
    Aug 2007
    Location
    ellington, ct
    Posts
    724

    Default Re: difference between power and manual master cylinder

    manuals run a smaller bore. being you have drum brakes, you will need a block and a 1" bore master. the rod length i cant help w/o looking at it.

  7. #7
    Join Date
    Mar 2009
    Location
    central Wisconsin
    Posts
    57

    Default Re: difference between power and manual master cylinder

    I am planning on switching to disc brakes. So, since the caliper piston is quite a bit larger than the wheel cylinder, maybe I'd be better off using the power master cylinder since it has a larger bore. Mike
    Master Effer-Upper and highly skilled in the art of unfabricating

  8. #8
    Join Date
    Dec 2002
    Location
    Loganton,Pa
    Posts
    7,168

    Default Re: difference between power and manual master cylinder

    Quote Originally Posted by GranSportSedan View Post
    The correct thing to do would be get a master cylinder for a manual disc brake car such as a olds W-30 or a vette. they would have the right volume as well as the correct size bore for pressure
    That's what I did on my car(manual disc setup) and the master cylinder is huge compared to the stock drum units. But it has a greater fluid capacity for when I really need it. Gonna be an exciting car for me as it has manual steering and disc brakes..
    Pat Harmon


    1973 Century Gran Sport 4 speed
    1970 455 Skylark
    (3)1986 Century GS's

  9. #9
    Join Date
    Jun 2005
    Location
    berkley, mass.
    Posts
    2,863

    Default Re: difference between power and manual master cylinder

    like i stated. if you use a power master it only has a dimple in the piston, the manual rod will fall out. you have to spend the extra for the manual one. the reason that they are more is there were fewer vehicles with manual, especially later on like s10's. i used a vette unit. yes it is heavy cast but it will work. spend the $ on a Strange unit.
    paul c.
    65 skylark conv. 455/th400
    79 z28 w/a dart block and headed 555 bbc. hopefully 9.50
    2 jetskis
    mountain bikes and road bikes
    no more hobbies please

 

 

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