I asked this question before and now I must do something.

My Hydraulic booster on the brake drivin by the power steering pump is leaking at a rate of a quart every 300 miles.

A rebuilt unit is 250 dollars about. A new one ??

Is there a rebuild kit availble?

Has anyone every rebuilt one?

where is it leaking from?

If I still worked, I could get you a new one for free.
New one $205 most places #260413116
Yes they make seal kits. $10, $11
built about 300,000,000 in 30 years
There are five o-rings, resevoir large o-ring, three square cut o-rings for your two studs and union and one o-ring that goes on your union.