I'm currently in process of rebuilding my ALB modulator. I have everything disassembled and I'm ready to order replacement o-rings. The problem is what type? I don't know if the alb o-rings are made of the standard rubber or one of the other synthetic compounds that are available. I don't want them to disentegrate 2 months after putting them in because of brake fluid. I'm hoping someone here can venture an educated guess. Reasonable choices seem to be:

Buna-N:
Good resistance to petroleum, hydrocarbons, fuels.
Widely used with most oils, hydraulic fluids, alcohol.
Poor resistance to sunlight, weathering and ozone.
Many compound variations for specific applications.
The least expensive most readily available material.
Basic temperature range: -40 F to +250 F*

Viton:
Excellent temperature and chemical resistance.
Excellent mechanical and physical properties.
Low compression set and low gas permeability.
Not for use with Acetone, Skydrol, or ethyl Acetate.
Basic temperature range: -20 F to +400 F*

EPDM / EPR:
Resistance to sunlight, weathering and ozone.
Poor resistance to petroleum oils and fuel.
Good heat and compression set resistance.
Basic temperature range: -65 F to +250 F*

anyone? Buna-N is the standard o-ring material. The others are significantly more expensive and I can't find anyone to supply them other than wholsalers. Which means I have to buy 20+ o-ring for $20 when all I need is 4.

 

no one?