Mythbuster: continuing project thread of my 1303 '75

[owdlvr]

Regarding the 944 MC: I did a lot of hard thinking why the rears gave so little brake force, even with the 23/19 cups.
My conclusion at the moment is that maybe, just maybe, with the brembo alu calipers, the travel is less than on a floating-caliper with a 53mm cup as the older 944's had. That would mean that the fronts already have full contact while the rears have not fully engaged because the rear 19mm cup just isn't pushed any further in the MC...
Its also means that you just can't use the MC cup sizes to 'adjust' your bias! The MC cup sizes are there only to level out the travel of the cups in the MC, so its equels both front and rear to give the same travel/force.
Hope this explaining of mine makes any sense.

Wally,

Do you have a proportioning valve installed? I've got one on my rally car, for solving different issues, but it strikes me that it would be appropriate for solving your brake issues. Mind you, you're also at a stage where a full dual-master/balancing bar would be appropriate as well!



I put a lever-style prop-valve in the rally car, though you would probably find a rotating knob style (Wilwood) would suit you fine. I suspect you'll balance out the brakes the way you want them and then leave it, as opposed to the rally car which gets changed as the road conditions change. I've done the rotating knob style mounted outside of the passenger compartment in other vehicles, as they aren't adjusted 'once set'. In your case I would think you'd need to install it on your front lines, as opposed to the rear which is typically the case.

-Dave

[Wally]

Hi Dave,

I have exactly that one in your pic
But, its indeed connected to the rear and because the rear still doesn't brake enough, not much use of it. It just look slike it doesnt work in my car at the moment and I think I know wh now (see above).. I don't like installing these on the front as we already run without powerbrakes and it would just be a bandaid imo.

A dual master balancing bar would mean installing a complete pedal assembly and I have never seen one installed in a bug that I like.

It is sooo simple really: I just need to find a set-up that overbrakes the rear a little so I can adjust with the 7-step Tilton... How hard can it be right?...

[Wally]

So today I have engaged into removing some rubber from the rear banana-arms and spring plates so it can be replaced with monoballs, poly-bronze bushings and the occasional black graphite-urethane:

[Humble]

ugh, I remember doing that job and it was no fun. I cut off as much rubber as I could from the spring plates then used a wire wheel for the rest. It took a whil but got the job done.