Since you are still struggling with this issue, let me make a suggestion.
This may or may not be relevant to this particular car, but if it is, it
will stymie all of your other attempted solutions.
Many drum brake systems include a residual pressure valve at the master
cylinder (usually hidden inside the housing at the outlet connection). The
purpose of this simple valve is to maintain a small amount of pressure in
the line at all times, to prevent the return springs from pulling the shoes
too far back from the drum, which would slow braking action and stress the
wheel cylinder seals.
If you replace the drum system with a disc system using this same master
cylinder, the residual pressure valve will cause locking of the disc brakes.
I actually don't know if this is a feature of the MGB dual master cylinder.
But given your problems, I think it behooves you to find out.
on 9/25/04 7:46 PM, Eric at eric@erickson.on.net wrote:
> I have a target that I set myself at the beginning of this year for my
> lap times in the 'B. Being bumped up a class (after winning my
> "unmodified class" a few years ago and adding some extra gadgets) I am
> now competing against more dollars than I have in my car budget, so a
> large part of my fun is competing against myself and my personal best
> times rather than these other cars (just yet).
>
> My latest issue has been with my new rear disc brakes (I still shake my
> head at why I have them - but it is cheaper to keep them than go back to
> drums right now) and the apparent imbalance towards the rear brakes that
> has seen me either "babying" the thing into corners... or getting thrown
> inelegantly off the track.
>
> Even with such cautious driving I was amazed to get a personal best time
> again last time out. If I am able to brake as hard and as late as I
> feel I should be able to I can see a second or two improvement in my
> times - and that is pretty much the be-all and end-all of what I am
> doing out there at the moment (with misbehaving brakes I am also
> super-cautious coming up behind other competitors, another major issue
> in getting my lap-times down and passing those who I should be beating).
>
> After that background, the query.
>
> I am chasing people with experience with in-cabin brake bias adjustment
> (brake proportioning valves).
>
> I have been looking at the Tilton and Wilwood systems/valves. They both
> look pretty similar and come in rotary (knob) and lever designs.
>
> Anyone have experience with either/all configurations and brands and
> care to share their tales of woe or success?
>
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires
Check out the new British Cars Forum:
http://www.team.net/the-local/tiki-view_forum.php?forumId=8
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