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Thread: HT Front end.

  1. #1
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    Default HT Front end.

    Hey lads,
    My HT Belmont has a drum brake front end and i was thinking of changing the brakes to discs. I have a disc front end from a HG V8 and was wondering if the HG discs, axles and calipers will fit onto my Belmont control arms?
    Do i also need to swap master cylinders?
    Cheers
    Matt

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  2. #2
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    Lads?

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  3. #3
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    Default

    You need to swap the master cylinder. There are different ones for disc / drum and drum / drum.

    Not sure if the control arms were different.

  4. #4
    Part of the furniture
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    Default

    hi
    Most likely the wishbones are the same .
    Unlikely the stub axles are the same typically drum and disc units not interchangeable .
    BUT... the mounting for ball joint should be the same . Need to check dimensions where ball joints go eg hole size and overall height of stub . The steering arms need to be same as well same height and length .

    The above is from other model experiences with Holden drum to disc conversion ,Torana and Hq
    As u asked u need some one who has done this conversion

    You need to verify at a very good brake shop with old books for correct parts as well.

    Is there differences between 6cyl and v8 disc setups ???
    Brake booster did the drum car even have one ??
    Brake master will be different
    Proportioning valve will be different [sets braking difference front to rear ]
    Residual valve fitted under floor for rear drums ??
    You will need the rubber hose mounts [different for disc ??]

  5. #5
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    Cheers guys thank you

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  6. #6
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    Default

    Hi Ozzy,
    I have done the conversion personally, Master Cylinder will have to be either converted changed or swapped over to a disc brake unit important you do this otherwise brakes will not work properly. Brake booster needs to be changed over also to a disc brake one as you can get power assisted drum type boosters but they wont work, best to buy reconditioned matching era Disc Brake Booster Master cylinder set up talk to to a brake shop on this again important.
    The Drum stub axles will have to be removed and changed over for disc brake stub axles the connecting arms should fit as I didn't replace mine
    You will also need to replace the hoses and have the correct small brake line from Caliper to hose.
    You may also need to change the rear wheel cylinders to suit a disc brake car but I'm not 100% sure on this cant remember.
    The only difference between a V8 disc set up and 6cyl one is the v8 has the thicker disc with the spacers in the calipers please don't mess with brakes seek professional opinion first.
    Hope this helps

  7. #7
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    Default

    Also forgot to mention VH312 Disc Brake Booster needed with support bracket.

  8. #8
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    HI
    So there u have it 7 posts should get u a good functioning brake setup .

    ""there is ALWAYS WAY WAY MORE to a brake conversion than u think there is ""

  9. #9
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    Quote Originally Posted by HK186p View Post
    Hi Ozzy,
    I have done the conversion personally, Master Cylinder will have to be either converted changed or swapped over to a disc brake unit important you do this otherwise brakes will not work properly. Brake booster needs to be changed over also to a disc brake one as you can get power assisted drum type boosters but they wont work, best to buy reconditioned matching era Disc Brake Booster Master cylinder set up talk to to a brake shop on this again important.
    The Drum stub axles will have to be removed and changed over for disc brake stub axles the connecting arms should fit as I didn't replace mine
    You will also need to replace the hoses and have the correct small brake line from Caliper to hose.
    You may also need to change the rear wheel cylinders to suit a disc brake car but I'm not 100% sure on this cant remember.
    The only difference between a V8 disc set up and 6cyl one is the v8 has the thicker disc with the spacers in the calipers please don't mess with brakes seek professional opinion first.
    Hope this helps
    Thanks mate cheers

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  10. #10
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    Quote Originally Posted by swampy View Post
    HI
    So there u have it 7 posts should get u a good functioning brake setup .

    ""there is ALWAYS WAY WAY MORE to a brake conversion than u think there is ""
    Yep your not wrong. Cheers everyone for your help.
    I will do all the work myself as I am a motorcycle mechanic and hand enough on cars. Just needed the advice.
    Thanks again

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