R8,R10,Floride,Caravelle - Brake Master cylinders different ?
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Thread: R8,R10,Floride,Caravelle - Brake Master cylinders different ?

  1. #1
    Fellow Frogger! R8philSA's Avatar
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    Default R8,R10,Floride,Caravelle - Brake Master cylinders different ?

    WARNING FOR NEW PLAYERS

    Never having done a Master Cylinder change on a Caravelle before I assumed that the R8/R10 Master Cylinder was the same, they certainly look the same on initial inspection.

    A bitter lesson just learnt!! They are not the same!

    I recoditioned a R8 Master Cylinder (I had a spare one) and removed the old Master Cylinder form the Caravelle and fitted the R8 Master Cylinder in its place. Wondered why I could not get any brake pressure no matter how many times I bled the brakes or pumped the pedel.
    After removing the Master Cylinder again as a last resort I discovered that the hollowed out section of the Master Cylinder piston is different, both in depth and diameter!! The R8 one I fitted was 42mm deep and the Caravelle one removed was 34mm deep. The difference in the depth meant that the brake piston activating rod fitted to the pedal shaft was not making contact with the R8 brake piston so hence no brake pressure.

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    Thought this might help some other froggers about to take on the challenging job of master cylinder removal and replacement.

    OH THE JOYS of French Motering Ha Ha Ha

    Cheers guys

    Phil
    IThompson and J-man like this.

  2. #2
    Too many posts! JohnW's Avatar
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    So right. I seem to recall adding ball bearings inside the piston at one stage....

    The opposite is true too: you must maintain a few thou of clearance between the piston rod and the piston, or the brakes bind. There is an adjuster, perhaps the single most awkward nut adjustment on the car....
    JohnW

    Renault 4CV 1951
    Renault R8 1965
    Renault Scenic 2005 (wife's)
    Renault Scenic 2007 (mine)
    Renault Scenic 2006 (daughter's)
    CitroŽn CX Pallas 1980

    National Co-ordinator, Renault 4CV Register of Australia

  3. #3
    Fellow Frogger! R8philSA's Avatar
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    Quote Originally Posted by JohnW View Post
    So right. I seem to recall adding ball bearings inside the piston at one stage....

    The opposite is true too: you must maintain a few thou of clearance between the piston rod and the piston, or the brakes bind. There is an adjuster, perhaps the single most awkward nut adjustment on the car....
    Hi John.
    Your right. Buggar of a job, especially laying on your back on stands!
    I did the same as you in that I added a small hardened nut inside the piston. Apparently there are different sizes of rods and pistons! Mine just ran out of adjustment but is perfect with the nut added.
    Why would Renault do that!! Just to cause guys like you and me headaches!!!
    Anyway, tomorrow I'll do the fitting and adjust as necessary but I did it on measurement so it should be spot on.
    Thanks for your comments.
    Cheers
    Phil

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