Sam,
I still believe the problems is in the PDWA vavle, I had the problem once and
then again several years later on my 72, I rebuilt it the second time and
switched back to dot 4 and haven't had the problem, knock on wood for over 8
years. I think my problem originated because I had dot 4 then switched to
silicone, with a very good alchol flush and then trouble started about two
years later. On my 69 every piece of the brake system way new and I run the
silicone and never had a problem for 6 years and 30,000 miles. I knoe the
dot 4 is bad stuff for the paint but not wanting to replace every piece, just
yet anyway that's the way I went.
Best regards
Jim Holewka
69 TR6
72 TR6
80 TR7
80 TR7-V8
New Jersey
In a message dated 3/27/01 10:43:48 PM, TRDOCTOR@aol.com writes:
<< Fellow listers;
Last summer, as some of you may remember, I posted a plea for help for the
locking of my front brakes on my '72 TR6. The common thought pointed to the
PDWA. I rebuilt it and everything seemed ok for awhile. Well, the problem
has re-manifested itself. I can feel the brake pedal "pump up" and the
brakes start dragging. It gets so bad that the brakes litteraly stop the
car. I have succeded in warping the rotors so I want to make sure I have the
problem solved before I change them out. Today, on the way to work, it
happened again. This time instead of cracking a bleeder, I cracked the brake
line at the master cylinder and the brakes released leading me to believe
that the problem is with the "tipping valve".
What I was wondering is: Is the rod that goes from the servo to the master
cylinder adjustable? I am wondering if the rod may be applying some pressure
to the master not letting the piston come all the way back and letting the
tipping valve open.
The other question would be: Is there something else I am missing? There is
nothing in the Bentley's that I can see that I am missing.
What I intend on doing, pending on the "list" response, is to disassemble the
master cylinder and see if the tipping valve is gummed up, or something
obvious is wrong.
A little background: The master cylinder is less than 10k old and the whole
system was rebuilt at the same time. I am also using silicone fluid.
TIA
Samuel R. Clark
Green Country Triumphs/Jaguar Enthusiast's Club of Oklahoma
VTR South Central Regional Coordinator
TS45355L O
CC82030U O
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