Author Topic: Softening Hardened Rubber Brake Hose  (Read 2629 times)

Offline FXguy

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Softening Hardened Rubber Brake Hose
« on: December 31, 2016, 04:30:02 PM »
I have original brake hoses without cracks, original  paint markings, and nice finishes on the metal fittings but the rubber is pretty stiff. 

Anyone have a product/technique for softening rubber brake hoses.  Have seen several threads where WD40 was used to condition weatherstrip and underhood hoses but nothing specific to brake lines.  Also have seen dot4 brake fluid used to soften hardened plalstic and rubber parts on Youtube but don't want to use something that may eventually cause the lines to break down.

TIA

-Scott

Offline midlife

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Re: Softening Hardened Rubber Brake Hose
« Reply #1 on: December 31, 2016, 08:58:54 PM »
I know many here swear never to have WD30 close to any of their cars.

Personally, I would be concerned about the hardened rubber brake lines; not so much the outside but the inside.  If they are hard on the inside, they are liable to be brittle and crack from the inside out, causing a potential safety hazard. 

Offline J_Speegle

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Re: Softening Hardened Rubber Brake Hose
« Reply #2 on: December 31, 2016, 10:47:17 PM »
Might want to search for the thread related to softening old weatherstrip for some possibilities. Outer jackets on these hoses are very touchy after all these years.
Jeff Speegle

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Offline jwc66k

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Re: Softening Hardened Rubber Brake Hose
« Reply #3 on: January 01, 2017, 12:52:19 AM »
I have original brake hoses without cracks, original  paint markings, and nice finishes on the metal fittings but the rubber is pretty stiff. 
If in doubt, throw it out.
Jim
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Offline bgp429

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Re: Softening Hardened Rubber Brake Hose
« Reply #4 on: January 01, 2017, 10:57:16 AM »
If any doubt don't use them. There are vendors who re-make single crimp hoses.

Previous thread

http://www.concoursmustang.com/forum/index.php?topic=5380.0

Offline FXguy

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Re: Softening Hardened Rubber Brake Hose
« Reply #5 on: January 01, 2017, 04:39:12 PM »
Thank you all for the input.

I would not personally use WD40 on underhood rubber, but it has been suggested in other posts.

Yes, Jeff, I reviewed the weather strip thread before posting this, but was looking for specific input on using the technique on brake hoses.

I don't want to get off topic here, but these hoses are specific to a June 64 K code, looks like DSD is specific to 68-69 model years, but I will contact to get more info. :D

BTW, car is thoroughbred, not a daily driver.  Some pics of the rear hose attached.

-Scott

Offline J_Speegle

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Re: Softening Hardened Rubber Brake Hose
« Reply #6 on: January 01, 2017, 04:51:35 PM »
I don't want to get off topic here, but these hoses are specific to a June 64 K code, looks like DSD is specific to 68-69 model years, but I will contact to get more info. :D

They/he doesn't - double checked last week for a 67 project :(   But if they do crack don't throw anything away. You never know when things will change (can be fixed) and you may need cores ;)
Jeff Speegle

Anything worth doing is worth doing concours ;)

Offline FXguy

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Re: Softening Hardened Rubber Brake Hose
« Reply #7 on: January 01, 2017, 05:48:24 PM »
They/he doesn't - double checked last week for a 67 project :(   But if they do crack don't throw anything away. You never know when things will change (can be fixed) and you may need cores ;)

Thanks for that, Jeff.  I always hang on to original parts. ;D

-Scott

Offline Chris Thauberger

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Re: Softening Hardened Rubber Brake Hose
« Reply #8 on: January 02, 2017, 11:35:33 AM »
I have used this on vacuum lines and other rubber components.

Chris


Offline 67gtasanjose

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Re: Softening Hardened Rubber Brake Hose
« Reply #9 on: January 02, 2017, 03:11:16 PM »



Hmmm! Fairly sure this product could be considered for use on MANY things (pertaining to automotive purposes ;) ) ...but ya-might keep it away from the young-uns...they might try it on OTHER non-automotive ideas :D
Richard Urch

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2005 (04/05) GT Premium Convertible, Windveil Blue, Parchment Top w/Med. Parchment interior,  Roush Body Appointments

Offline Smokey 15

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Re: Softening Hardened Rubber Brake Hose
« Reply #10 on: January 02, 2017, 06:32:09 PM »
 Show it a naked pic of Roseanne Barr. That will soften any hose.   
 Seriously, If you are driving the car, I'd replace them with date coded. I'd ziplock bag the originals. If you only trailer, I'd try silicone.

Offline mtinkham

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Re: Softening Hardened Rubber Brake Hose
« Reply #11 on: January 03, 2017, 01:55:07 PM »
I have had positive results cleaning rubber and plastic pieces with dishwasher liquid. I always test a small section first. As already mentioned, the current integrity of the brake hose is unknown and any cleaning or restoring will probably not improve the integrity.
1967 S-code Fastback, GT, 3-speed manual, Metuchen, Scheduled 04-21-1967 - Actual 04-25-1967

Offline FXguy

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Re: Softening Hardened Rubber Brake Hose
« Reply #12 on: January 03, 2017, 03:19:01 PM »
Show it a naked pic of Roseanne Barr. That will soften any hose.

Thanks all for the input...but this one is the best...LOL!!! ;D

Offline FXguy

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Re: Softening Hardened Rubber Brake Hose
« Reply #13 on: January 03, 2017, 03:23:02 PM »
I have used this on vacuum lines and other rubber components.

Chris



Thanks Chris, I'll try this on some in the shop and see how they hold up before trying on anything that goes back on  the car.

Offline midlife

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Re: Softening Hardened Rubber Brake Hose
« Reply #14 on: January 03, 2017, 07:22:19 PM »
Another option is to find a better used set of hoses and restore them if they are more pliable.