Hydraulic reservoir cap leak

[MWoodland at Dentsply.com]

Hello folks,
I've read the archives somewhat exhaustively on the subject, and the only
commonality is that Pentosin does indeed leak from the reservoir  cap some
times.
It has been attributed to:
1. Bad Accumulators
2. Bad Pumps
3. Bad Brake Servos
Rather than throw money wholesale at Gina ('86 5KTQA), could anyone shed
some light on this?

She's been off the road for the last 3 years.. getting her beauty rest, and
has just bounced back with new rotors, pads, calipers, e-brake cables, and
a gutted proportioning valve.
She stops better than ever, and the fluid level is midway between the  Max
and Min lines.
Could it be as simple as a leaking cap (the gasket looks perfect)?
I'll start running diagnostics tonight, but wanted to consult the Oracle
first, as to BTDTs.

As a Plan B, Has anyone replaced the Brake Booster with a vacuum booster
off a 4KQ? I've heard tell of it in the past, and as I'm typically off the
boost when I'm on the brakes, it makes more sense to me. I'd just go into
the backup pump and remove the pistons dedicated to the high pressure
circuit, keeping the low pressure circuit active for the P.S. That would
pull the hydraulic accumulator and booster from the circuit, leaving me
better suited to face the next 100,000 miles.

Again, any BTDTs would be appreciated.
Best regards,
Mark

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