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Gary H. and Herb, I do agree
that DOT 5 brake fluid should not be used with Anti lock Brakeing Systems
(ABS) and caution should be used when purposly, or accidently,
mixing Dot 5 with any other brakes fluid.
My obection to anything
I know of DOT 3-4 Is that it will rust your Master cylinder outside and
the firewall, and any paint that it touches. When bleeding brakes or changeing
brake fluid, It will come out with rusty color to some extent. That cannot be
good. If you have a tiny leak at the pushrod seal ( fairly
common) it will soak into the carpet under-pad , or the firewall insulation, You
may not know it untill the metal in that area is rusty-corroded. It is corrosive
to the inside of the MC and to the cap threads if applicable. I would be
interested in knowing if there is a brake fluid that does not damage
the Master Cylinder, or the surrounding paint . IMO , I will
stick with the DOT 5 until somethinf better comes
along.............respectfully...............................MO
----- Original Message -----
Sent: Friday, July 11, 2014 7:07 AM
Subject: Re: How to: 65 C-body disc brake
conversion (1st installment) LONG READ!
I am not saying it WILL fail if you use D5 but the fact that
about 1 in 10 cars we converted did have problems related
to D5 and All Auto Manufactures & many after market
suppliers, will not warrantee any cars or parts that were
converted to D5 speaks loudly to me. D4 has proven to be rust
& trouble free and will work just fine in any stopping
situation all of our cars will ever encounter if changed as
recomended. Again if it ain't broke don't fix it! The
D5 cult following began with people in the military
figuring if it's good enough for Uncle Sam I'm going to
give it a try in my car thus the hyperbole began. Dot 5 was
developed for the military back when D3 technology was all that was
available, because of all the adverse environments it's vehicles
can encounter. A vehicle may be deep in a jungle today &
depending on the currant political environment, in a desert or any other
adversely different environment tomorrow. D5 had
proven to be more stable for them than D3, now how many personal
vehicles encounter these changes in it's lifetime let alone in a few
days? Last I talked to anyone even the military is taking a
second look at D5's benifits anymore. A note, the military
systems were designed for D5 not converted from D3! Another plus
for D5 was, it's ability to withstand fading under extreme braking
conditions in race cars over the D3 of the day. With new
D4 formulations, not so true anymore! Harley Davidson, everyone
likes to point out they use D5 in their systems from NEW!
Like the military their systems were built to use D5 & D5
only! The biggest issue they run into is contamination from people
using D3 or D4 to top off a master even after it is marked D5 only,
now you have a bucket of contaminated worms! The only way to
effectively get all of the old D3/4 out of your system is
power bleed D5 through your system and monitor for residual
D3/4 bubbles balled up in the fluid till it runs
contamination free, again $$ down the drain or guaranteed gunk from
contamination! Everyone uses a cadre of fluids/chemicals to clean
a system out and all have an adverse affect on the rubber parts in your
system! Why kick that dog? Bottom Line, personally when it
comes to stopping my vehicles when I hit the pedal, I am
hesitant to play the odds! Probably why I never go to the Casino's
ether, & believe me we have them all over the area!! Dot 4 for
me! Also I would rather spend my hard earned $$.¢¢ on things
you & I can see.
-------Original Message-------
Date: 7/11/2014
12:40:47 AM
Subject: Re: How to:
65 C-body disc brake conversion (1st installment) LONG READ!
I can only speak from
my experienc with Dot 5 brake fluid. I have used it in my car since
building it in 2006 and have put several miles on the car. For
whatever reason, it does take out in-line brake light switches. I
changed mine to a mechanical switch. My brake cylinder rubber
parts are still like new. No rust at all, or water, when I crack
open the bleeder valve to inspect for contamination. My Master
cylinder , cap, and firewall area doesn't have a bit of rust on them and
are dry. And I don't worry about dripping some on my paint when I
take the MC cap off. I have used it on Harley Davidson disc
brakes since 1974 with no problem . H.D. recommends use of Dot 5.
I am useing it on my 64 Dodge build . If it costs a little more,
you may have to buyjust one less six
pack.!......................................MO
----- Original Message -----
Sent: Wednesday, July 09, 2014 9:04
AM
Subject: RE: How to: 65 C-body disc
brake conversion (1st installment) LONG READ!
Maybe they know a little something about what ill
affects Dot 5 has on your system? Dot
5 jacks system rubber parts up by saturating them with
silicone, a lot of times causing hard pedals, early failure
and so on! It is also hell on hydraulic brake light
switches! Switch to dot 5 you cant go back unless you
replace ALL rubber in the system including hoses to keep it
from slugging up or just selfdistructing. Dot 3/4 absorbs
moisture/condensation/dirt and holds it in suspension till it is
saturated, and at that point it starts rusting. dot 5 wont
absorb moisture, and lets condensation/dirt sink to low
spots in your system causing rust issues quicker. Your
supposed to change your brake fluid about every 25K, not wait
till it is saturated with moisture and starts to rust from the
inside out. Unless your taking your car from one
weather/environmental extreme to another like say the military, or
a high speed race car with extreme braking, dot 5 is of
no practical benefit other than being able to be one of
the sheople that gets a worm fuzzy feeling spending a lot
of extra money on snake oil. Yes I know the hype, D5
wont damage my paint, I just don't pour D3 or D4 on my
paint! Problem solved!! I doubt many if any people on
this site drive their cars in, or, to the extreme that D5 is
designed to be used for!
Also, if you do use D5 in your system your supposed to mark
your master as such because it is NOT compatible with D3 or D4, a
step no one does that I have seen.
I am sure I just kicked the old Dot bees nest, but I have had
many years of experience converting systems over and back because
of the problems. O, BTW MPB is not the lone ranger with that
policy! I ONLY use Dot 4 in all of my cars and I change it
about every 25K or 5 years along with my coolant, tranny
& dif fluids. No one changes these till they have
problems, then it's too late. In addition, funding had
nothing to do with me not using Dot5 because I could get all
I wanted for free. I just did not want all the
probable issues on my cars. If it ain't broke don't fix
it!!
-------Original
Message-------
Date: 7/9/2014
6:35:33 AM
Subject: RE:
How to: 65 C-body disc brake conversion (1st installment) LONG
READ!
Hey Lyle, why would MPB forbid
DOT 5 fluid? Seems kinda weird.
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