Volvo Repair: ABS failure, volvo service, sensor signal

Question
My 1994 volvo has 78,000 miles on it and the Volvo service people tell me that the ABS contol unit has failed and needs to be replaced at a cost of about $900. This is the second ABS control unit that has failed. In 1998, when the car had only 32,000 miles on it, the ABS control unit failed and had to be replaced. My questions are:
Is it safe to drive without replacing the ABS unit? IIs this model known for this type of problem because it seems ridiculous that two ABS control units have gone bad at 78,000 miles. I've contacted Volvo corporate and they tell me there is nothing they can or will do about the problem.

The Volvo service dealer says they got codes:
213 - Left wheel sensor, signal absent.
214 - Right wheel sensor, signal absent
142 - Brake switch open short or open circuit short.

I'd appreciate any advice or insight you can give me.  Thanks! Elizabeth


Answer
Hello,
you did not write your car type, but I think it is 850.
Yes, according to the codes the ABS control unit should be replaced with new one.
You can drive the car without ABS with safety. Think that your car has no ABS, that is same... When the ABS lamp lights the system will not work, but if it does not light the system will work, that is another point you should know...
Regards...