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Brake Fluid in '62 AH Sprite

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R

RTew

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I have to change the brake light pressure switch in a AH Sprite and was told to top off the master cyclinder with brake fluid prior to pulling switch.
I cannot find Castrol Brake fluid anywhere in this area and was going to use NAPA Mac's Brake Fluid DOT 3

Is this ok or will it hurt the rubber seals.

Thank You for any help and comments
 
Any non-silicone brake fluid will be fine assuming that is what you are using now. BTW I would top off the reservoir <span style="font-style: italic">after </span>the procedure to make up for what fluid you may leak out during the change.
 
The switch will be located at a low point in the brake system, so you will be able to pull the old one out and replace immediately with the new one with minimal leakage and a good chance that you won't need to bleed the system. Just swap it quickly.
 
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