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  1. #1
    Join Date
    Aug 2008
    Location
    Hawkhurst, Kent
    Posts
    244

    Locking rear brakes

    Hi ,
    I had a IVA test today on my Ram cobra at Gillingham.
    it went pretty well to be fair but failed mainly on rear brakes locking up before the fronts on a dynamic brakes test.
    Any ideas on how I could sort this? It’s on Jag inboard discs. Would a proportioning valve fix it?
    Thanks

    Ben
    Always in the sh*t, just the depth that varies !

    AKA The Silver Fox

  2. #2
    Join Date
    Mar 2007
    Location
    Maldon Essex
    Posts
    346
    Yes it should fix that and I think that mine had one but I have now changed the pedal box to a tilton with a bias bar so I don't need one.

  3. #3
    Join Date
    Jan 2006
    Location
    Chelmsford Essex
    Posts
    1,366
    Check you have the routing correct to the master brake cylinder as the piston is split to forward bias to the front first. It could be simple as switching the connections.

  4. #4
    Join Date
    Aug 2004
    Location
    Christchurch, NZ
    Age
    59
    Posts
    2,441
    This is a 'known' thing for the Ram. You fit an adjustable bias valve but in the front circuit rather than the (conventional) back circuit.

    Cobra Build Chassis nsf.jpg
    Last edited by mylesdw; 28-09-20 at 10:07 PM.
    Cheers

    Myles D-W

  5. #5
    Join Date
    Aug 2004
    Location
    Christchurch, NZ
    Age
    59
    Posts
    2,441
    Quote Originally Posted by mylesdw View Post
    This is a 'known' thing for the Ram. You fit an adjustable bias valve but in the front circuit rather than the (conventional) back circuit.

    Cobra Build Chassis nsf.jpg
    Actually, I may be completely wrong here - you have the opposite symptom to the one Adrian (from Ram) described to me years ago.
    Cheers

    Myles D-W

  6. #6
    Join Date
    Aug 2007
    Location
    Bournemouth
    Posts
    383
    What master cylinder are you using? Maybe as suggested before, the pipe connections to this could be arse about face.

    David.
    Life is driving the Cobra. The rest of the time is just waiting.

    Wessex region caretaker rep.

  7. #7
    Join Date
    May 2004
    Location
    Cowbridge, United Kingdom
    Age
    62
    Posts
    10,102
    I've had to use a proportioning valve on the rear brake line two of my previous builds.
    I think from a Sierra or Mondeo.
    Don't forget it can't be adjustable for IVA.
    Kev Davies
    South Wales Area Rep. UKCC Membership Secretary
    DAX Mk4, 383 Chevy Stroker, Tremec. SOLD
    Contemporary CCX 3-4028, 445ci Big Block FORD FE,TKO 600, Old School IVA'd and SOLD
    Dax De Dion LS2 and T56 IVA'd June '17 SOLD
    1965 Ford Mustang 289 Convertible SOLD
    In build- Hawk 289 Sebring Awaiting IVA

  8. #8
    Join Date
    Feb 2007
    Location
    Essex, UK
    Posts
    4,042
    Had exactly the same thing atGillingham. Fitted an adjustable proportioning valve which was the cause of my second fail!
    after lots of head scratching, I discovered the rear pads had been contaminated and were ultra sticky. Fitted a new set of normal pads and it flew through....alway check the obvious/cheapest fix first!

    simon
    WARNING: Translation of author's random thoughts may have resulted in the unintended introduction of grammatical errors, typos, technical inaccuracies, lies, propaganda, rhetoric, blasphemy, rambling, and/or exhibition of shocking levels of ignorance.

  9. #9
    Join Date
    Sep 2004
    Location
    Bressingham
    Posts
    1,354
    You could reduce the surface area in contact with the disc by adjusting the pad with a grinder.

  10. #10
    Join Date
    Mar 2009
    Location
    liverpool
    Age
    47
    Posts
    507
    For using an adjustable bias valve, my understanding is that it's ok for IVA if after it has been set. The adjustment is rendered inoperable. i.e. the adjustable knob shaft is cut off flush. So it can't be adjusted.

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