[Fot] brake bias

[Sam Halkias]

Sorry for the late opinion, but I could not agree more with Mike Munson. I
added brake bias guages to my cars many years ago and the only time I ever
look at them is in the pits or on the grid for a rain race. Make any
adjustment there and that's it, no time to read them at speed. ( I have used
video to record the guages during testing) After reading this thread I can't
imagine a guage "fluttering", especially if there is no loss in performance.
True a little run out will not help, but I don't believe that is the cause. Do
you have any sort of in line proportioning  valve or something? Either the
gauge is bad (which I doubt) or you have some sort of bias pressure unit for
the rear and you may have too much rear bias dialed in, thus the fluttering of
the gauge. I like to see the front pressure up initially then have the rear
follow, with about 800 PSI for the front and 400 for the rear junder max
braking, too much rear will get you backwards in a hurry! Also check your
balance bar and make sure its free to move as sometimes they can bind up, a
little WD-40 every now and then can help.



Sam

> From: fasttrs at mindspring.com
> To: 19to1tr6 at comcast.net; Billb at bnj.com
> Date: Wed, 18 Mar 2009 12:58:50 -0800
> CC: fot at autox.team.net
> Subject: Re: [Fot] brake bias
>
> I've been told "if you have enough time to look at your gauges you're not
> going fast enough or braking late enough". LOL
>
> I have never noticed any feedback from my pedal but have heard some
clicking
> due to run out on a car with mufflers. A light turning of the rotors solved
> the problem.
>
> Mike
> -----Original Message-----
> From: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] On
> Behalf Of rob
> Sent: Tuesday, March 17, 2009 3:05 PM
> To: Bill Babcock
> Cc: fot at autox.team.net
> Subject: Re: [Fot] brake bias
>
> On Randalls sujestion i did a quick check on the disc thickness on about 10
> locations Many are the same and the most variation is .006 I did not spend
> much time on this and will do it more carefully as time allows It will take
> more time to do the run out check as well. Is .006 enough to cause
> sittuation
> rob
> ----- Original Message -----
> From: Bill Babcock
> To: rob
> Cc: fot at autox.team.net
> Sent: Tuesday, March 17, 2009 4:09 PM
> Subject: Re: [Fot] brake bias
>
>
> I'd see how true your rear disks are, a little wobble causes a lot of
> pressure variation. Rear wheels are also prone to a lot more hop as the
> weight
> shifts forward. Hard to see how that would make the pressure flutter, but
it
> might.
>
>
> On Mar 17, 2009, at 8:56 AM, rob wrote:
>
>
> I have Mike Munson's rear disc brake convertion on my tr-6. I recently
> added
> bias gauges. The rear gauge flutters rapaidly under breaking.I have not
> lost
> performance and i am pretty certain there is no air in the system The
> gauge
> for the front remains steady under breaking thanks for the help rob
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