Page 1 of 2 12 LastLast
Results 1 to 20 of 21

Thread: AH 3000 rear disc brake conversion

Forum to discuss Austin Healey Sports Cars

  1. #1
    Freshman Member
    Join Date
    Oct 2016
    Location
    San Gabriel, CA
    Posts
    4
    Blog Entries
    1
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    AH 3000 rear disc brake conversion

    Researching converting my rear drum brakes for AH 3000 BJ8 to disc brakes. If anyone has any information or suggestions please let me know.
    Thanks

    Daniel 1964

  2. #2
    Great Pumpkin JPSmit's Avatar
    Join Date
    Nov 2004
    Location
    Toronto, ON
    Posts
    18,546
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    54
    Thanked in
    51 Posts

    Re: AH 3000 rear disc brake conversion

    welcome! can I suggest you repost your question in the Austin Healey section - not everyone looks here as it is the introduction page.
    John-Peter Smit
    1976 MG Midget
    1969 Vauxhall Viva GT
    1958 Fiat Multipla (Barn art)

  3. #3
    Administrator Basil's Avatar
    Join Date
    Dec 2000
    Location
    Turn left at Albuquerque
    Posts
    23,844
    Blog Entries
    7
    Thanks Thanks Given 
    50
    Thanks Thanks Received 
    95
    Thanked in
    93 Posts

    Re: AH 3000 rear disc brake conversion

    Hi Daniel, I'm moving this thread to our Austin Healey forum (I'll leave a "re-direct" marker in the New Members Intro forum) If you're reading this then you have been magically transferred to the AH forum.

    Please do go back to the "New Members" forum and post an introduction of yourself.

    Basil
    “The smallest act of kindness is worth more than the grandest intention.” - Oscar Wilde

  4. #4
    Freshman Member
    Join Date
    Oct 2016
    Location
    San Gabriel, CA
    Posts
    4
    Blog Entries
    1
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Re: AH 3000 rear disc brake conversion

    Thanks, still learning to navigate this site.

  5. #5
    Freshman Member
    Join Date
    Oct 2016
    Location
    San Gabriel, CA
    Posts
    4
    Blog Entries
    1
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Re: AH 3000 rear disc brake conversion

    Thanks

  6. #6
    Yoda John Turney's Avatar
    Join Date
    May 2002
    Location
    Concord, CA
    Posts
    3,643
    Thanks Thanks Given 
    46
    Thanks Thanks Received 
    30
    Thanked in
    29 Posts

    Re: AH 3000 rear disc brake conversion

    Conversion kits are available from:

    Denis Welch, https://www.bighealey.co.uk/austin-h...general?page=2. These are the ones I have.
    AH Spares, https://www.ahperformanceparts.co.uk...r/default.aspx
    Steve Gerow, a member of this forum (steveg), https://pbase.com/stevegerow/healey_rear_disc_setup. According to his signature, he sells a complete kit, including a part that makes the emergency/parking brake work properly.
    John, BN4

  7. #7
    Freshman Member
    Join Date
    Oct 2016
    Location
    San Gabriel, CA
    Posts
    4
    Blog Entries
    1
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Re: AH 3000 rear disc brake conversion

    Quote Originally Posted by John Turney View Post
    Conversion kits are available from:

    Denis Welch, https://www.bighealey.co.uk/austin-h...general?page=2. These are the ones I have.
    AH Spares, https://www.ahperformanceparts.co.uk...r/default.aspx
    Steve Gerow, a member of this forum (steveg), https://pbase.com/stevegerow/healey_rear_disc_setup. According to his signature, he sells a complete kit, including a part that makes the emergency/parking brake work properly.
    Thank you guys, this new info is very helpful
    Thanks
    Daniel

  8. #8
    Luke Skywalker dougie's Avatar
    Join Date
    May 2008
    Location
    Portland, Oregon
    Posts
    1,559
    Blog Entries
    1
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    23
    Thanked in
    18 Posts

    Re: AH 3000 rear disc brake conversion

    Hi Daniel -

    I have rear discs on my '57 vintage racer, but find the drums provide plenty of braking power with the right pads on my '65 Bj8 for street perfromance driving. I did upgrade to balanced and vented drums which also eliminated the scuttle shake that occured at 60 mph.

    Wheel 1.jpg

    Dougie
    '65 BJ8 3000 MKIII GN.29
    '57 100-SIX MM Vintage Racer GN.1 #414
    Team Healey PDX

  9. #9
    Yoda steveg's Avatar
    Join Date
    Sep 2007
    Location
    Altadena, CA
    Posts
    3,813
    Thanks Thanks Given 
    94
    Thanks Thanks Received 
    143
    Thanked in
    122 Posts

    Re: AH 3000 rear disc brake conversion

    John, Thanks for the mention. Since it's relevant, guess I'm allowed a mild self-plug.

    The kit's the most complete; the installer needs to supply their own calipers, e-brake rods, hard lines and proportioning valve.

    RearDiscThruWheel.JPG
    DiscRotorKitComplete0616.jpg
    Last edited by steveg; 11-08-2019 at 01:59 PM.
    Steve Gerow
    Altadena, CA, USA
    Maker of most complete Big Healey rear disc kit
    Check out my galleries:
    http://www.pbase.com/stevegerow


  10. #10
    Jedi Trainee
    Join Date
    May 2004
    Location
    Dove Canyon, CA
    Posts
    376
    Thanks Thanks Given 
    3
    Thanks Thanks Received 
    6
    Thanked in
    5 Posts

    Re: AH 3000 rear disc brake conversion

    Ventilated and balanced rear drums are an excellent alternative to modifying originals. I also have them installed on my BJ7. Considering a 4 pot caliper upgrade for the fronts now. GONZO

  11. #11
    Yoda steveg's Avatar
    Join Date
    Sep 2007
    Location
    Altadena, CA
    Posts
    3,813
    Thanks Thanks Given 
    94
    Thanks Thanks Received 
    143
    Thanked in
    122 Posts

    Re: AH 3000 rear disc brake conversion

    Gonzo - you won't be sorry you converted to 4-pots. Make sure the calipers fit your smaller (Type 14 IIRC) adapter plates. I believe they're available in both Type 14 and 16 bolt centers.

    Edit: what selection of pads is available for the AHspares calipers? Do they use a pad design from a common car?
    Last edited by steveg; 11-08-2019 at 03:40 PM.
    Steve Gerow
    Altadena, CA, USA
    Maker of most complete Big Healey rear disc kit
    Check out my galleries:
    http://www.pbase.com/stevegerow


  12. #12
    Jedi Trainee Joe Schlosser's Avatar
    Join Date
    Jul 2015
    Location
    Chester NY
    Posts
    347
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    7
    Thanked in
    7 Posts

    Re: AH 3000 rear disc brake conversion

    Cpnsidering the nose heavy condition upgrading the front is the place to spend your money. The rear brakes probably do not do a lot of the braking. Adding a lot of braking to the rear and not upgrading the front will cause a big balance problem.
    Joe Schlosser
    SCCA National License, Retired
    60 Bugeye, since 1966
    SCCA FP, sold but not forgotten

  13. #13
    Yoda steveg's Avatar
    Join Date
    Sep 2007
    Location
    Altadena, CA
    Posts
    3,813
    Thanks Thanks Given 
    94
    Thanks Thanks Received 
    143
    Thanked in
    122 Posts

    Re: AH 3000 rear disc brake conversion

    Quote Originally Posted by Joe Schlosser View Post
    Cpnsidering the nose heavy condition upgrading the front is the place to spend your money. The rear brakes probably do not do a lot of the braking. Adding a lot of braking to the rear and not upgrading the front will cause a big balance problem.
    Agree. That's why the proportioning valve is necessary with the addition of rear discs.
    Steve Gerow
    Altadena, CA, USA
    Maker of most complete Big Healey rear disc kit
    Check out my galleries:
    http://www.pbase.com/stevegerow


  14. #14
    Yoda
    Join Date
    Feb 2007
    Location
    California USA
    Posts
    4,026
    Thanks Thanks Given 
    5
    Thanks Thanks Received 
    52
    Thanked in
    46 Posts

    Re: AH 3000 rear disc brake conversion

    Nobody asked me, but that's never stopped me before ... I have/had several cars with 4-wheel disks. None of them have, IMO, anything more than barely adequate parking/emergency brakes; both my Healeys, with the big drums in back--front, too for the BN2--have excellent parking/emergency brakes. Just sayin' ...

  15. #15
    Yoda steveg's Avatar
    Join Date
    Sep 2007
    Location
    Altadena, CA
    Posts
    3,813
    Thanks Thanks Given 
    94
    Thanks Thanks Received 
    143
    Thanked in
    122 Posts

    Re: AH 3000 rear disc brake conversion

    Quote Originally Posted by Bob_Spidell View Post
    Nobody asked me, but that's never stopped me before ... I have/had several cars with 4-wheel disks. None of them have, IMO, anything more than barely adequate parking/emergency brakes; both my Healeys, with the big drums in back--front, too for the BN2--have excellent parking/emergency brakes. Just sayin' ...
    With the stock setup, the rear drums are true emergency brakes, in that they will actually stop the car.

    John Turney and I (and some others) have added dual master cylinders to divide the fronts from the backs, giving an emergency braking setup.

    My adapter plates augment the e-brake force and give a better e-brake handle angle.

    EbrakeLever.JPGBrakePlatesFinal.jpg
    Steve Gerow
    Altadena, CA, USA
    Maker of most complete Big Healey rear disc kit
    Check out my galleries:
    http://www.pbase.com/stevegerow


  16. #16
    Yoda John Turney's Avatar
    Join Date
    May 2002
    Location
    Concord, CA
    Posts
    3,643
    Thanks Thanks Given 
    46
    Thanks Thanks Received 
    30
    Thanked in
    29 Posts

    Re: AH 3000 rear disc brake conversion

    When I installed my front and rear discs, I had a conversation with Denis Welch about the front/rear balance. He said with the 1.5" piston diameter rear calipers and the 2.125" piston front calipers, proper brake balance can be obtained with proper pad selection.
    John, BN4

  17. #17
    Yoda steveg's Avatar
    Join Date
    Sep 2007
    Location
    Altadena, CA
    Posts
    3,813
    Thanks Thanks Given 
    94
    Thanks Thanks Received 
    143
    Thanked in
    122 Posts

    Re: AH 3000 rear disc brake conversion

    Quote Originally Posted by John Turney View Post
    When I installed my front and rear discs, I had a conversation with Denis Welch about the front/rear balance. He said with the 1.5" piston diameter rear calipers and the 2.125" piston front calipers, proper brake balance can be obtained with proper pad selection.
    John,
    Did you pursue that avenue and if so, did you verify it with a panic stop?

    FWIW before installing the proportion valve, I did a panic stop with my then-new 4-wheel discs and the car about swapped ends.

    Richard Mayor (Boy Racer) gave me an easy method of setting the proportioning valve with the car on jackstands, which I'd be happy to pass along to anyone who wants it. The valves are around $40 and installing and adjusting them is a one-time-only task.

    The DW system would call for different pads front and rear. If one changed front pads then maybe the rears would need to be experimented with for each change. The proportioning valve would call for the same pad composition front and rear.

    I've been using the Centric Ceramic pads for several years with good unboosted pedal pressure and absolutely no squeaking.
    Steve Gerow
    Altadena, CA, USA
    Maker of most complete Big Healey rear disc kit
    Check out my galleries:
    http://www.pbase.com/stevegerow


  18. #18
    Jedi Trainee Joe Schlosser's Avatar
    Join Date
    Jul 2015
    Location
    Chester NY
    Posts
    347
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    7
    Thanked in
    7 Posts

    Re: AH 3000 rear disc brake conversion

    My pointr egarding the rear brake conversion is that the drum brakes are probably sufficient and the dollars should be spent on improving the front brakes.
    I am guessing that the fronts do 85-90% of the stopping.
    Joe Schlosser
    SCCA National License, Retired
    60 Bugeye, since 1966
    SCCA FP, sold but not forgotten

  19. #19
    Yoda John Turney's Avatar
    Join Date
    May 2002
    Location
    Concord, CA
    Posts
    3,643
    Thanks Thanks Given 
    46
    Thanks Thanks Received 
    30
    Thanked in
    29 Posts

    Re: AH 3000 rear disc brake conversion

    Quote Originally Posted by steveg View Post
    John,
    Did you pursue that avenue and if so, did you verify it with panic stops?
    Yes, they worked fine until I felt I needed to rebuild the brake system after 12 years and I put in the wrong master cylinder. My new rebuild includes the correct MC. I have to look through my records and find the correct pads (good ones in front, not so good in back).
    John, BN4

  20. #20
    Yoda John Turney's Avatar
    Join Date
    May 2002
    Location
    Concord, CA
    Posts
    3,643
    Thanks Thanks Given 
    46
    Thanks Thanks Received 
    30
    Thanked in
    29 Posts

    Re: AH 3000 rear disc brake conversion

    Quote Originally Posted by Joe Schlosser View Post
    My pointr egarding the rear brake conversion is that the drum brakes are probably sufficient and the dollars should be spent on improving the front brakes.
    I am guessing that the fronts do 85-90% of the stopping.
    You are correct, but rear discs look cool and don't cause scuttle shake.
    John, BN4

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
  •