Brake Fluid for 922B?

Lost braking ability on my 922B at a rather inconvenient moment the other day. After changing my pants, I checked the master cylinder reservoirs and both had no visible fluid levels in them. The old manual calls for SAE 70 R3 brake fluid. Is there a modern equivalent I can use? I don't know what's in there now (or not in there, as the case may be) because I just acquired this machine a few months ago and did not get any info on the fluids from the previous owner... any help would be greatly appreciated. Thanks!

Matt

Matt,
You might think about changing to a DOT-5 fluid, which is silicone base , and does not attract moisture like DOT-3 does. This involves a complete draining and flushing the system.

Ed

I run the silicone based stuff in all my old cars and trucks....rubber parts last forever as well as the corrosion control advantage.

Thanks. I will give him a dot 5 infusion and hope the braking issue clears up simple. Much obliged.
Matt