Jim.
I have had nothing but problems with DOT 5 fluid and have ended up
purging it from my systems and replacing with DOT 4. Even though
I pressure bleed the (entirely new) systems I would still get tiny
air bubbles that combine enough to cause problems, then would
dissperse so that things worked ok (not great) then congeal again
and cause problems.
Also, if you do have any seal problems, DOT 5 fluid will find it real fast :(
I have had good success in rebuilding cylinders before. The key is
to very carefully inspect the bore and piston. If either is scored or
worn out of spec then the system will leak, either imediately or
much earlier than expected.
Congradulations about getting the car back on the road. I hope mine
is back by next summer....
-grego
Jim Davis wrote:
> List,
> I've finally got my "restored" '75 TR6 back on the road after a two
> year engine rebuild and I've driven about 200 miles. Today, after a 25
> mile drive I noticed that occasionaly the brake pedal will sink quite
> low without much stopping power when the brakes are applied but will
> become firm after a pump or two. The problem is becomming progressively
> worse. There is no leak at the master cylinder, which remains full of
> DOT 5 silicone fluid and there are no leaks at the front calipers or
> rear wheel cylinders. The m/c was replaced with a new one at the
> original restoration in 1994.
> My guess is that fluid is moving past the seals in the m/c, but since
> they are so expensive to replace, I'm hoping some one has some
> suggestions of other (less expensive) possible causes. I've not had much
> long-term luck with rebuilding m/cs. Has any one had a rebuild last much
> longer than 9 months to a year before internal/external leaking
> occurred? I haven't.
> Any recommendations or suggestions are appreciated.
> Jim Davis
> Fortson, GA
> CF38690UO
> CF37325U
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