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  #1 (permalink)  
Old 12-04-2007, 09:06 PM
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O-rings in Brake Distribution Block, Square or Round and Material?

Since I replaced everything in this 68 Mustangs braking system I figured I would tear down the distribution block and proportioning valve.


1. Inside of the distribution block there is a spool that has three O-rings on it. I noticed that two of them were the square type and one was round. Would it make a difference if I use all round O-rings or should I try to find square ones?

2. I bought a kit to rebuild the stock proportioning valve and noticed that the O-rings are made of Viton. Would this be ok to use with DOT 3 brake fluid or should I replace them with EPDM O-rings?

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Old 12-30-2007, 11:02 AM
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Looks to me that the Viton is a no good with DOT type 3 fluid and I should use the EPDM. Anyone think otherwise?

Quote:
EPDM (Ethylene Propylene, EPM)
EPM is a copolymer of ethylene and propylene. Ethylenepropylene-diene rubber (EPDM) is produced using a third monomer and is particularly useful when sealing phosphate-ester hydraulic fluids and in brake systems that use fluids having a glycol base.

Heat resistance
Up to 300F (149C) (max. 400F (204C) in water and/or steam).

Cold flexibility
Down to approximately 70F (57C).

Chemical resistance
Hot water and steam up to 300F (149C) with special compounds up to 400F (204C)
Glycol based brake fluids up to 300F (149C)
Many organic and inorganic acids
Cleaning agents, soda and potassium alkalis
Phosphate-ester based hydraulic fluids (HFD-R)
Silicone oil and grease
Many polar solvents (alcohols, ketones, esters)
Ozone, aging and weather resistant.

Not compatible with:
Mineral oil products (oils, greases and fuels).

Quote:
Viton (Fluorocarbon, FKM)
Fluorocarbon rubber has excellent resistance to high temperatures, ozone, oxygen, mineral oil, synthetic hydraulic fluids, fuels, aromatics and many organic solvents and chemicals. Low temperature resistance is normally not favorable and for static applications is limited to approximately 15F (26C) although in certain situations it is suitable down to 40F (40C). Under dynamic conditions, the lowest service temperature is between 5F and 0F (15C and 18C). Gas permeability is very low and similar to that of butyl rubber. Special fluorocarbon compounds exhibit an improved resistance to acids, fuels, water and steam.

Heat resistance
Up to 400F (204C) and higher temperatures with shorter life expectancy.

Cold flexibility
Down to 15F (26C) (some to 40F (40C)).

Chemical resistance
Mineral oil and grease, low swelling in ASTM oil No. 1, and IRM 902 and IRM 903 oils
Non-flammable hydraulic fuels in the group HFD
Silicone oil and grease
Mineral and vegetable oil and grease
Aliphatic hydrocarbons (fuel, butane, propane, natural gas)
Aromatic hydrocarbons (benzene, toluene)
Chlorinated hydrocarbons (trichlorethylene and carbon tetrachloride)
Fuels, also fuels with methanol content
High vacuum
Very good ozone, weather and aging resistance.

Not compatible with:
Glycol based brake fluids
Ammonia gas, amines, alkalis
Superheated steam
Low molecular organic acids (formic and acetic acids).
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Old 12-30-2007, 08:16 PM
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Your correct, HPDM is what you need, or better yet Kalrez.

Vince
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Old 12-30-2007, 10:43 PM
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Quote:
Originally Posted by 302 Z28
Your correct, HPDM is what you need, or better yet Kalrez.

Vince
Will EPDM be good also?
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Old 12-31-2007, 08:16 AM
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Quote:
Originally Posted by Scode68
Will EPDM be good also?
Sorry, that is what I meant EPDM.

Vince
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