Brake Valve on the side sub frame for a 69 camaro

[sah62]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 169indy</div><div class="ubbcode-body">O-rings are easy to find (Viton) material is a good choice. The shaped seals are going to be he difficult items to source.</div></div>

Viton is not compatible with automobile brake fluid [1]. EPDM is the way to go. The other seals are a little more difficult, but they're doable.

[1] One source: http://www.elderrubber.com/material.htm

[169indy]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: sah62</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 169indy</div><div class="ubbcode-body">O-rings are easy to find (Viton) material is a good choice. The shaped seals are going to be he difficult items to source.</div></div>

Viton is not compatible with automobile brake fluid [1]. EPDM is the way to go. The other seals are a little more difficult, but they're doable.

[1] One source: http://www.elderrubber.com/material.htm </div></div>

You are correct for the most part,
EPDM is Good for DOT 3,4, &amp; 5
VITON is in fact good for DOT 5

I use in Silicone based DOT 5 brake fluid.

REF:
2.2.4 Ethylene Propylene Rubber (EPR, EPDM)
EPR copolymer ethylene propylene and ethylene-propylenediene
rubber (EPDM) terpolymer are particularly useful when
sealing phosphate-ester hydraulic fl uids and in brake systems
that use fl uids having a glycol base.
• Glycol based brake fl uids (Dot 3 &amp; 4) and silicone-basaed
brake fl uids (Dot 5) up to 149°C (300°F).

2.2.7 Fluorocarbon (FKM)
Fluorocarbon (FKM) has excellent resistance to high temperatures,
ozone, oxygen, mineral oil, synthetic hydraulic fl uids,
fuels, aromatics and many organic solvents and chemicals.
Low temperature resistance is normally not favorable and
for static applications is limited to approximately -26°C
(-15°F) although certain compounds are suitable down to
-46°C (-50°F). Under dynamic conditions, the lowest service
temperature is between -15°C and -18°C (5°F and 0°F).
Gas permeability is very low and similar to that of butyl rubber.
Special FKM compounds exhibit an improved resistance
to acids and fuels.
Heat resistance
• Non-fl ammable hydraulic fl uids (HFD).
• Silicone oil and grease.
• Mineral and vegetable oil and grease.
Not compatible with:
• Glycol based brake fluids.


I have easy access to most material types. O-rings, It is as you state the shaped seals are a very big problem to source.

I like your site and efforts look very good and helpful

Jim