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  1. #11
    Join Date
    Aug 2012
    Location
    Worthing,West Sussex
    Posts
    98
    Got pinged at Gillingham for brake bias.Bought a Ford Mondeo bias valve from ebay https://www.ebay.co.uk/itm/123727112642 and plumbed into rear brake line.Seems to have done the trick! The make is RAM

  2. #12
    Join Date
    Jul 2012
    Location
    NW England
    Posts
    693
    Quote Originally Posted by sunday View Post
    Thank you for that info, have you keep a rear prop valve or direct plumbed ?

    I still have the valve in the rear circuit. Not sure I completely understand your question but this is a pressure reduction valve (Wilwood) which operates on rear curcuit only, as opposed to a proportioning valve which I take to mean a valve which will operate on both curcuits reducing effect on one while increasing on the other.
    My understanding is that this valve will give a constant reduction in output pressure regardless of input pressure. Ideally I guess a rising rate would be better but too complex and difficult to get right I'd imagine.
    My car didn't even go through SVA as I built a car quicker than the government were able to bring the system in (and they started before me!) and in any case this was some time after the original registration.

  3. #13
    Join Date
    Jul 2012
    Location
    NW England
    Posts
    693
    Quote Originally Posted by johnnyoz View Post
    Got pinged at Gillingham for brake bias.Bought a Ford Mondeo bias valve from ebay https://www.ebay.co.uk/itm/123727112642 and plumbed into rear brake line.Seems to have done the trick! The make is RAM

    What do they actually check on the test? Is it just that the fronts lock first or has there got to be a specific balance?

  4. #14
    Join Date
    Aug 2012
    Location
    Worthing,West Sussex
    Posts
    98
    The tester just hits the brakes hard and it is his impression.He did mine on a loose bit of gravel and personally I thought it was marginel.Still,don't disagree with the tester......

  5. #15
    Join Date
    Jul 2012
    Location
    NW England
    Posts
    693
    Quote Originally Posted by johnnyoz View Post
    The tester just hits the brakes hard and it is his impression.He did mine on a loose bit of gravel and personally I thought it was marginel.Still,don't disagree with the tester......
    Wow! Even worse than I thought. Can't see any way that indicates how useful or safe the brakes are. I'm sure my brakes would have passed that test easily but were not good in practice.

  6. #16
    Join Date
    May 2004
    Location
    Cowbridge, United Kingdom
    Age
    63
    Posts
    10,278
    They test the braking force front , back and handbrake on the rollers.
    Then they do calculations based on the design weights you have provided.
    They also ask you to drive the car around the test centre and slam on the brakes, they want to see the fronts lock up before the rears.
    I've had Avon sticky rubber on my last two cars, so locking it up at all was quite hard.
    Kev Davies
    South Wales Area Rep. UKCC Membership Secretary
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  7. #17
    Join Date
    Aug 2012
    Location
    Worthing,West Sussex
    Posts
    98
    My tester checked the brakes on the rollers and said that they were fine.He drove the car himself and faulted the brake bias.He said "Fit a bias valve,but not too much change as the brake readings are very good"

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