Because I replaced my original Dunlop clutch master cylinder
with the Girling style, I need a longer hose to go from the
clutch fluid reservoir to the master cylinder. This is just
the low pressure feed hose. Are there any issues on what
kind of hose to use? Googling around, I see that
brake/clutch hoses need to meet the SAE J1401 standard. Is
that basically a high-pressure duty standard? (Which this
in not.) I’ve got some fuel line hose of the right size
which meets SAE 30R7 (not for fuel injection applications,
again the high pressures). Could that serve? I’m no
material scientist, but I would think that hose that could
serve in the petrol environment could deal with hydraulic
fluid? Thanks for any insights.–
Mike - 1966 E-type OTS
Aiken, SC, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Mike Gregory sent Fri 24 Feb 2006:
Mike,
Use EPDM (ethylene-proylene dimer) hose for this application. Also
know as EPR sometimes. It is compatible with brake fluid. Fuel
hose is buna-n which will decompose on exposure to brake fluid. I
use Mcmaster-Carr (mcmaster.com) for this stuff. Look up part
5304K19 for 5/16’’ or 5304K22 for 3/8’’ ID.
Good luck,
Pete–
Pete Silverberg '67 FHC
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Mike Gregory sent Fri 24 Feb 2006:
Mike
I asked the same question, but relative to the brakes, a couple of
months ago. The answer was NEVER use fuel hose for brake fluid but
coolant hose is ok. I have had a piece of fuel hose and a piece of
coolant hose in a jar of brake fluid since being given that advice
and can testify to the accuracy. There is no change to the coolant
hose but the fuel hose is unrecognisable as either a piece of hose
or a piece of rubber.
Pete–
The original message included these comments:
with the Girling style, I need a longer hose to go from the
clutch fluid reservoir to the master cylinder. This is just
the low pressure feed hose. Are there any issues on what
kind of hose to use? Googling around, I see that
–
Pete Grice 71 S3 2+2 1S50440
Church Lawton, Cheshire, United Kingdom
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Mike Gregory sent Fri 24 Feb 2006:
Mike,
I just replaced my hose. I found a local shop where they
make hydralic hoses for many applications. I asked them to
sell me 2 feet of hydralic hose for my brake /clutch. They
were very kind and gave me the hose-no charge.
Best,
Shelley Yoelin–
69 E- FHC
La Grange Park, IL, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Peter Silverberg sent Fri 24 Feb 2006:
Thanks for the tip, Pete. I’m headed to mcmaster. But now
I’m wondering - the Jaguar clutch and brake masters and
pistons have multiple rubber internal parts. Did Jaguar use
EPDM there? Not that I’m going to mess with the OEM stuff.
Just curious.–
The original message included these comments:
Use EPDM (ethylene-proylene dimer) hose for this application. Also
know as EPR sometimes. It is compatible with brake fluid. Fuel
hose is buna-n which will decompose on exposure to brake fluid. I
use Mcmaster-Carr (mcmaster.com) for this stuff. Look up part
5304K19 for 5/16’’ or 5304K22 for 3/8’’ ID.
–
Mike - 1966 E-type OTS
Aiken, SC, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Pete Grice sent Fri 24 Feb 2006:
Pete G: cool experiment! Didn’t appreciate that brake fluid
was so effective on certain types of rubber. Hmmm…this
phenomenon might make a good script basis for CSI - ‘‘yes
dear, I just replaced all the brake hoses on your car.’’–
The original message included these comments:
I asked the same question, but relative to the brakes, a couple of
months ago. The answer was NEVER use fuel hose for brake fluid but
coolant hose is ok. I have had a piece of fuel hose and a piece of
coolant hose in a jar of brake fluid since being given that advice
and can testify to the accuracy. There is no change to the coolant
hose but the fuel hose is unrecognisable as either a piece of hose
or a piece of rubber.
–
Mike - 1966 E-type OTS
Aiken, SC, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Mike Gregory sent Sat 25 Feb 2006:
Mike,
I found a blub on the web that makes sense to me
(http://www.xs11.com/tips/maintenance/maint1.shtml). I don’t know
who this is or where it comes from but the points made are good.
Since brake fluid (DOT 3 or DOT 4) is not petroleum based, Buna-N
(nitrile) rubber is not compatible. The internal rubber parts of
the braking system on our cars must be ethylene-propylene rubber or
they would fail in a hurry! Standard hydraulic fluids are
petroleum based and will eat up the EPDM in the brake system.
Similarly, standard hydraulic hoses will probably be buna-n rubber
and fail with brake fluid. Be careful guys! Suffice it to say
that the materials used in automotive braking systems are carefully
chosen and messing around with these materials is a dangerously bad
idea. I am sticking with DOT 3 or DOT 4 fluid, standard rebuild
kits, and EPDM hose.
Cheers,
Pete–
Pete Silverberg '67 FHC
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Shelley Y. sent Fri 24 Feb 2006:
Hi Shelley, I hope that you read the posts by Peter S. That
hydraulic hose , which is designed I believe for regular (
dyno ) oil is nitrile, and your brake fluid will
swell/degrade it.You need a hose designed for coolant/brake
fluid which is made from EP rubber. While the line from the
brake fluid resevoir is not under pressure, its the
degradation products that get in your brake system. Shelley
i think you’ve already been there havn’t you? Regards,–
The original message included these comments:
I just replaced my hose. I found a local shop where they
make hydralic hoses for many applications. I asked them to
sell me 2 feet of hydralic hose for my brake /clutch. They
were very kind and gave me the hose-no charge.
Shelley Yoelin
69 E- FHC
–
John M Holmes 1973 E Type SIII Supra 5-Speed, 1970 SII OTS
Sarnia, Ontario, Canada
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–