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Thread: 11" brakes.....

  1. 18th January 2012, 04:36 PM #1
    LWB123 Guest

    11" brakes.....

    Hello from Brisbane.

    I realise that the issue of swapping 109" model brakes on to 88" vehicles has had a fair airing (e.g. Landy Girl thread recently), but it is in my planning to do just that.

    I understand that the the 6 cylinder S3 models have an 11" X 3" front drum and 11" X 2.5" rear drum arrangement, as well as the dual slave cylinders up front and single at the back. The 6 cylinder 2A models might have only had a 2.5" wide front drum perhaps?

    Anyway, I am planning to go for 3" front, 2.5" rear drums and source second hand backing plates and drums for the job, but will only use new parts for the rest. I am also assuming that the master cylinder will need to be changed over to a 109" model as well, possibly with a vacuum booster.

    My questions are:

    - whether the front backing plates for the 3" drums are different to those for models that carry 2.5" front drums?

    - the tolerance allowed for machining the braking surface of used brake drums on the relevant Land Rover models - it is an issue for selecting or rejecting used disc rotors, so I am assuming that it might be an issue for selecting used drums?

    - will a 109" master cylinder with vacuum booster fit in a SWB S3 without modification to the pedal assembly box or guards? Or is that only an issue for putting these units into S2 and 2As or if a dual circuit system is used?

    Cheers,
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  2. 18th January 2012, 05:02 PM #2
    Lotz-A-Landies's Avatar
    Lotz-A-Landies
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    • AFAIK all 6 cyl and Stage 1 (V8 & Isuzu) had 3" front brakes, no matter if they were SIIa or SIII.
    • The mastervac (booster on the pedalbox) was introduced some time after the 6 cyl IIRC Suffix G SIIa. Before that they had an inline booster (Clayton-Dewandre or PBR VH24 or VH44).
    • The backing plate for the 3" is different to the 2 1/2" because the cylinders are centred on the shoes.
    • You need to get the correct drums for your wheel studs (9/16" BSF or 16mm) but you can use SIIa 3" backing plates with SIII 3"drums or vice versa.
    • The for the early type pedalbox with the inline booster, the master cylinder is the same whether you have 2 1/2" or 3" front brakes.
    • New brake drums are relatively inexpensive and standard shoes easy to get, IMHO the additional cost of O/S shoes and machining of the drums is not justified when new ones are so cheap
    Hope this helps
    Diana

    You won't find me on: faceplant; Scipe; Infragam; LumpedIn; ShapCnat or Twitting. I'm just not that interesting.
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  3. 18th January 2012, 06:03 PM #3
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    isuzurover
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    Quote Originally Posted by Lotz-A-Landies View Post
    [*]You need to get the correct drums for your wheel studs
    It is very simple and easy to drill out the stud holes on the drums. I did it when I fitted S3 hubs.

    Btw - S3 hubs are a worthwhile upgrade!
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  4. 18th January 2012, 09:45 PM #4
    Timj
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    Hi LWB123,

    I have bought new drums from FWD motors in Fairfield for less than they were available on ebay. That was standard 10" drums for a SWB but it would be worth giving them a call for a price. I have also bought a complete brake kit from Paddocks in the UK that included all pads, cylinders, springs and screws for all four wheels and it was a pretty good price. Yet again it was for the standard 10" brakes but they would have them for all of them.

    Cheers,

    TimJ.
    Snowy - 2010 Range Rover Vogue
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  5. 18th January 2012, 10:10 PM #5
    russellrovers
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    drums

    have a shed full of drums cheap or going to the scrapper some new old stock ring0428732001 jim
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  6. 19th January 2012, 12:35 AM #6
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    Col.Coleman
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    You will need to change the Drivers side guard and mounting bracket to use the series 3 booster and master. Otherwise you will need to fit a remote booster.

    CC
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  7. 19th January 2012, 06:39 AM #7
    LWB123 Guest

    Guard change?

    Quote Originally Posted by Col.Coleman View Post
    You will need to change the Drivers side guard and mounting bracket to use the series 3 booster and master. Otherwise you will need to fit a remote booster.

    CC
    Hello again.

    So, the side guard has to be changed even for a Series 3 SWB for the booster and cylinder swap?

    Cheers,
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  8. 19th January 2012, 06:44 AM #8
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    JDNSW
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    Quote Originally Posted by LWB123 View Post
    Hello again.

    So, the side guard has to be changed even for a Series 3 SWB for the booster and cylinder swap?

    Cheers,
    No. All Series 3 guards allow room for it. The remark was applicable to Series 2a.

    John
    John

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  9. 19th January 2012, 09:40 AM #9
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    65s2a
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    I have S3 booster fitted to 88" 1961 2A..I only needed to hand cut a small amount off the guard near the booster to make it fit. The horizontal guard above the wheel just in front of the booster did not need any adjustment...I also have 11" front brakes...works well. Booster photos attached hopefully. Les
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  10. 19th January 2012, 11:52 AM #10
    LWB123 Guest

    Thanks..........

    Quote Originally Posted by JDNSW View Post
    No. All Series 3 guards allow room for it. The remark was applicable to Series 2a.

    John
    Hello again from Brisbane.

    I thought that was the case from some earlier threads, so felt I should get clarification in case I was wrong - not an uncommon state of affairs according to my wife and kids.......

    Cheers,
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