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I used a fuel tank for an RC airplane. I attached the small tank to the booster by taping a hard drive magnet to the plastic tank and just sticking it to the booster. But now for the fun part. I had this arrangment on two cars an 84 and 85 both would throw fluid when driven very hard at the track or autocross. They were fine when driven on the street. Replaced master cylinder and surprise no more loss of brake fluid. I too thought it was my astounding g-forces causing the issue but it appears the master cylinder was the true cause. If the master cylinder is the original the cups inside are likely getting hard and under severe braking are allowing pressure to bleed back into the res tank. Mine did not leak out of the master cylinder which would obviously indicate a problem. Side effect brakes are much better with the new master cylinder less front lockup. The way the master cylinder is designed there are two cups up front and one for the rear. The front has two cups to separate the front from the rear. The double cups appear to hold pressure better and again under severe braking the rear appears to bleed off internally.

Anyhow there ya go........