[Healeys] Fwd: bugeye brake problem

[Charlie Baldwin]

Mark,
This website may help you:
http://www.gerardsgarage.com/Garage/Tech/DbrakeUg.htm
I don't have any Spridgets, but saw this as I do have an MGA with a dual 
cylinder.
Charlie


On 10/31/2013 1:52 PM, mark henderson wrote:
> I have a rear brake issue with my '58 Sprite.   The Bugeye has the stock
> .875" rear wheel cylinders and we have installed a 1967 Sprite/Midget
> tandem master brake cylinder and front disc brakes. The problem is; we can
> turn the rear brake drums by hand when the front brakes lock up. We have
> sealed all leaks and bled the system thoroughly, no air remains in system.
> We have adjusted rear brakes shoes as tight as possible. We backed off
> pedal stop to try to increase piston travel in master cylinder. When we
> bleed front brakes first then check rear brakes, drums are locked.
>
> My summation is that the new master cylinder is not pushing enough fluid to
> the rear brakes before the fronts lock up. When the front brakes lock, the
> piston cannot go any further into the cylinder to push any more fluid to
> the rear brakes. Bleeding the fronts first and then checking the rears are
> locked seems to prove this. I have gone thru the math to see if the
> original .875" cylinders require a lot more fluid than the .75" cylinders
> of the 1967 Midget and they will require more volume of fluid to travel
> equal distances but not a lot.
>
> Short of replacing the rear brakes with later Midget/Sprite  backing plates
> and wheel cylinders, does anyone know of another fix for this? Has anyone
> done this swap before with only the tandem master cylinder and front disc
> brakes swapped over. My old Lucas/Girling books show no wheel cylinder with
> smaller bore that will fit the Bugeye backing plates. Thank you for any
> thoughts.  Regards,  Mark
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