I have having some issues with a Tilton dual brake master cyl installation I
started over the weekend on my Spitfire Racer
I bought two used 1 inch Tilton masters with all the correct brackets/mounts
with remote reservoirs plus two Wilwood proportioning valves to be installed
on my Mk1 spitfire, replacing the original single circuit master.
The cylinders were rebuilt using the correct Tilton kits. I made up new
lines from the master outlets to the valves and then into the existing brake
lines.
Everything went well until the final bleeding process began.
The 1st time I tried to bleed the front first then the back. The front
brakes felt fine with good travel and pedal feel. But when I tried to bleed
the backs the system would bind and I had a very high pedal effort. When I
blend the backs with the fronts open they worked fine by themselves. When
everything was closed the system will bind with very high pedal effort but
no brakes. Not good.
I then tried bleeding both systems at the same time, and that seemed to work
until I closed off all the speed bleeders and the system would bind again.
I believe that the master cyl providing pressure to the front brakes caused
the pistons to press the calipers closed before the rear ones can apply the
rear brakes. Making adjustments to the proportioning valves does not seem
to make any changes. I also tried adjusting the bracket connecting the two
pistons to the pedal to push one in earlier than the other but that did not
make a difference. Swapping the cylinders or the valves side to side made no
difference. I believe each individual component is working right, just not
together.
Before I go much further I have some basic questions:
Are two 1 inch masters the way to go? Do I need to run a smaller cylinder
on one side or the other? Do I need two valves or will one suffice as the
other will always be open?
Any help/advice will be appreciated.
Thanks
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