Any ideas how my brake setup never led to disaster? Options

[messick]

By far the most non-standard part of my car is the brake setup. I knew it was weird going into things because there are huge front calipers bolted on in the rear, so I had no emergency brake.

After sending pictures of the calipers to Eric at PMB, I now now know I have 48mm BMW calipers in the front, and some 48mm Girling front calipers in the rear. This gives me the suboptimal brake bias of 1:1.

Actually, suboptimal is an understatement. I believe Eric used phrases like "guaranteed disaster" and "death trap" when I talked to him on the phone. Any sort of panic stop should have led to the car spinning out of control. He assumed some sort of brake bias value was involved since no one had died driving the car.

So, I've actually removed the calipers and master cylinder out, I don't see any value! At first my dad (most immediate PO) was sure he had panic stopped without incident, but now he's not 100% sure. However, the PO before him raced this car to a PCA autocross class win. I find it hard to believe you could be that successful in autocross without really, really getting on the brakes. And you aren't going to win of you are occasionally flying off the track out of control.

So, what gives? I can see the lines from the cylinder to the tunnel, and from the back firewall to the calipers. All I see are two 90 degree fittings and a T. The cylinder is one fo the upgraded 19mm ones. Is there something that can done to a master cylinder to customize bias?

My plan, based on Eric's advice, is to replace my 48mm "rears" with actual 911 M rear calipers, of which I've already obtained a pair of cores. I will also be putting in the Porsche pressure regulator value thing to prevent the rears from locking up, also based on Eric's advice. I'm also going to get a new 19mm MC from 914Rubber. However, I want to make sure I understand what's going on with current system, just in case it will affect the new stuff I want to replace it with.

Here are some pictures:

Master Cylinder ports: (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-24381-1595533231.1.jpg)

Cylinder to front of tunnel: (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-24381-1595533232.2.jpg)

Rear firewall: (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-24381-1595533232.3.jpg)

Rear T: (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-24381-1595533232.4.jpg)