All old bindings break the plastic gets brittle and they break. Ask an ski tech how many pairs of bindings they have broken testing them.
The old tyrolias broke because of a plastics problem. I have heard than it was the plastics supplier's mistake that caused plastic embrittlement. Most people broke the binding toe lug and got their bindings replaced for free. They warrantied thousands and thousands of bindings. Then they shut the replacement program down after a few years. If you were skiing more you would have gotten new bindings. Shame on you for not skiing more. What was happening was people were going to garage sales/thriftshops and buying old skis with tyrolias on them, they would break the toe lug and then would warranty the bindings. Tyrolia lost a lot of money on this warranty program, and it wasn't their fault but try suing DuPont or GE plastics for bad materials or material selection advice.
info from internet site: http://www.darryl.com/skiing/AlpineEquipment.html:
"It's pretty much old news at this point (it happened around 1988). At one point Tyrolia did indeed recall several bindings for a defect in some of the plastic parts. This recall and upgrade program is now over. According to Tyrolia, every owner's manual states that your bindings should be serviced/ inspected at least once a season. Since the recall began circa 1988 there has been ample time for 'annual' binding servicing. If your binding was under recall, the shop would/should have notified you when you brought your equipment in for service and offered the appropriate options. However, since this vintage (pre 1988) of bindings were sold with the lifetime warranty, Tyrolia will cover broken bindings under this warranty. You'll need to take your bindings to an authorized Tyrolia dealer along with a proof of purchase and the owner's manual. The bindings will either be sent back to Tyrolia or they'll be replaced by the shop. "http://www.cpsc.gov/cpscpub/prerel/prhtml88/88011.html