Results 1 to 7 of 7

Thread: dual master cylinders?

  1. 9th June 2014, 07:18 PM #1
    reg of the overflow
    reg of the overflow is offline Fossicker
    Join Date
    Jan 2013
    Location
    melbourne
    Posts
    57
    Total Downloaded
    0

    dual master cylinders?

    This is a serious question.


    I have a 1961 SWB with a Holden engine, hence it has 11'' LWB brakes at the front and SWB 10" at the back. It never had great brakes, by normal standards but whilst rebuilding her I have overhauled the brakes. New everything -shoes, pipes, lines, cylinders, everything! And it has the CB type LWB master cylinder as well, as it had before.


    now, I have bled the brakes -over and over, in every way possible as the book tells me, as people on here told me. Pumped like billyo, used a syringe and reverse bled from the slave cylinders, etc. When I clamp off the front brakes you couldn't ask for a better pedal, rear works awesome. When I clamp the rear brakes off, I get half a pedal - damn fine by LR standards, but, when I unclamp both, the pedal goes almost to the floor then pumps up on the second and third pump. I am over it!


    I got to thinking though, that it would be possible to put another master cylinder on next the existing one and connect them together, it wouldn't really be hard to do. That way, one could operate the rear brakes and the other, the front brakes.


    Think this would work?
    Reply With Quote Reply With Quote
  2. 9th June 2014, 08:05 PM #2
    Blknight.aus's Avatar
    Blknight.aus
    Blknight.aus is offline RoverLord Vendor
    Join Date
    Aug 2006
    Location
    Melbourn(ish)
    Posts
    26,495
    Total Downloaded
    0
    nope, youd have all sorts of problems with it.

    youd be in with a shot if you converted all the brakes to the same size, fitted balance rods to keep the pressure even on both MC's and ran split hydraulics for the brakes.

    your issue is worn snail cams or the shoes are in the wrong way round along with a potential side serve of over size drums and incorrectly radiused shoes.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.
    Reply With Quote Reply With Quote
  3. 9th June 2014, 09:07 PM #3
    reg of the overflow
    reg of the overflow is offline Fossicker
    Join Date
    Jan 2013
    Location
    melbourne
    Posts
    57
    Total Downloaded
    0
    worn cams............. not thought of that. I didn't replace the drums as they are relatively new - perhaps a year old. might get them checked. Thanks
    Reply With Quote Reply With Quote
  4. 10th June 2014, 06:10 AM #4
    JDNSW's Avatar
    JDNSW
    JDNSW is offline RoverLord Silver Subscriber
    Join Date
    Jan 1970
    Location
    Central West NSW
    Posts
    29,511
    Total Downloaded
    0
    What master cylinder do you have? If you are trying to operate 11" two leading shoe brakes with a swb master cylinder you will never get a pedal.

    John
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol
    Reply With Quote Reply With Quote
  5. 13th June 2014, 07:16 PM #5
    reg of the overflow
    reg of the overflow is offline Fossicker
    Join Date
    Jan 2013
    Location
    melbourne
    Posts
    57
    Total Downloaded
    0
    it's the LWB master cylinder........ still working on it, when I get time
    Reply With Quote Reply With Quote
  6. 13th June 2014, 08:17 PM #6
    Homestar's Avatar
    Homestar
    Homestar is offline Super Moderator & CA manager Subscriber
    Join Date
    Aug 2010
    Location
    Sunbury, VIC
    Posts
    20,105
    Total Downloaded
    0
    As Dave mentioned - is the radius of the shoes wrong? This caught me out once before. Used new drums and new shoes, could never get a pedal. Turned out the shoes were only touching in a couple of spots. A bit of work later - shoes off and on a dozen times I managed to put a radius on them that contacted almost all of the drum - got a great pedal after that.

    Not sure what the correct method is, but I got there in the end.

    Decided to do it a bit easier with the Series 3 I'm helping my son rebuild at the moment and stick Cookeys disk brake conversion on it.
    If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.
    Reply With Quote Reply With Quote
  7. 14th June 2014, 08:48 AM #7
    gromit's Avatar
    gromit
    gromit is online now ForumSage Supporter
    Join Date
    Jan 1970
    Location
    Narre Warren South
    Posts
    6,795
    Total Downloaded
    0
    Quote Originally Posted by bacicat View Post
    As Dave mentioned - is the radius of the shoes wrong? This caught me out once before. Used new drums and new shoes, could never get a pedal. Turned out the shoes were only touching in a couple of spots. A bit of work later - shoes off and on a dozen times I managed to put a radius on them that contacted almost all of the drum - got a great pedal after that.

    Not sure what the correct method is, but I got there in the end.

    Decided to do it a bit easier with the Series 3 I'm helping my son rebuild at the moment and stick Cookeys disk brake conversion on it.
    Had the same with my Series I, radius was wrong.
    Rubbed chalk on the linings, drum back on, applied the brake gently while someone spun the drum, then filed off the high spots.
    Eventually got good contact, adjusted up the brakes and had a good pedal. Brakes are still average and you do have to plan ahead.....


    Colin
    '56 Series 1 with homemade welder
    '65 Series IIa Dormobile
    '70 SIIa GS
    '76 SIII 88" (Isuzu C240)
    '81 SIII FFR
    '95 Defender Tanami
    Motorcycles :-
    Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C, Suzuki SV650
    Reply With Quote Reply With Quote
« 2A 109 EX-MIL EXHAUST?? | series ii heater pipes »

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules

Search AULRO.com ONLY!
 Search All the Web!