Rear brake master cylinder hose - The GSResources Forums

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Join Date: Jan 2025

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#1

Rear brake master cylinder hose

04-09-2013, 10:15 PM

Is there any specific type of material needed to replace the hose that connects to the rear brake reservoir to the master cylinder? Like, i know there are fuel grade hoses, but what about brake fluid grade? Or am I over thinking this... LOL
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chuck hahn

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#2

04-09-2013, 11:30 PM

Why not just get an OEM one from the dealer or put an add in the parts wanted section..cant be very expensive to get one.

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bwringer

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#3

04-10-2013, 09:43 AM

Brake fluid is very different stuff...

I've seen brake fluid cause fairly rapid deterioration in most of the fuel-grade hoses I've used with my brake bleeding setup. Nitrile and Viton, for example, are vulnerable to brake fluid. So far, the yellow Tygon fuel tubing I started using last year seems OK (I don't think it's OK for continuous exposure, though), but just about everything else I've tried fails.

The OEM piece would be the way to go, but it's showing as no longer available.

I would Google for some chemical compatibility charts that mention brake fluid and order up the appropriate tubing at McMaster-Carr.

And don't forget the important last step: SHARE YOUR FINDINGS! What size and material did you order?

Last edited by bwringer; 04-10-2013, 09:48 AM.

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5azzmonkey

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#4

04-10-2013, 10:24 AM

Have a look here:

Materials: FKM, Nitrile, Silicone, Polyurethane, EPDM, Fluorosilicone, PTFE, PTFE filled, PEEK, Nylon, Acetal

http://www.dkirubber.com/materials.asp

EPDM looks like it will work.

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subid
#5

04-10-2013, 10:31 AM

Wow, I just replaced mine with fuel line. Never even thought about it not being compatible with brake fluid.

I did find this since reading this post

Error Page | eBay

http://www.ebay.com/itm/3-8-ID-REMOTE-BRAKE-FLUID-RESERVOIR-HOSE-/330576924784?pt=Vintage_Car_Truck_Parts_Accessories&vxp=mtr&hash=item4cf7eb9070

OEM was 22 bucks at Partzilla

opinions on the Ebay hose please
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bwringer

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#6

04-10-2013, 07:36 PM

Originally posted by subid View Post

Wow, I just replaced mine with fuel line. Never even thought about it not being compatible with brake fluid.

I did find this since reading this post

Error Page | eBay

http://www.ebay.com/itm/3-8-ID-REMOTE-BRAKE-FLUID-RESERVOIR-HOSE-/330576924784?pt=Vintage_Car_Truck_Parts_Accessories&vxp=mtr&hash=item4cf7eb9070

OEM was 22 bucks at Partzilla

opinions on the Ebay hose please

If that's the right ID, sure, why not?

I have no idea what the correct ID would be. 3/8" is 9.525 mm, so it should work fine on a 10mm fitting.

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salty_monk

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#7

04-10-2013, 07:49 PM

I read: 3/8" ID x 1/2" OD Tygon� 2375 Ultra Chemical Resistant Tubing (also 2075 works allegedly).

$2.25 foot... not sure if there is a minimum

http://www.usplastic.com/catalog/item.aspx?itemid=75639&catid=864&clickid=searchresults

This tubing offers an unequaled combination of chemical resistance, clarity, and flexibility. It is virtually unaffected by acids, bases,...

Do your own research as it's not a product backed by Tygon for this purpose...

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SqDancerLynn1
#8

04-10-2013, 08:59 PM

Use some transmission hose
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