One problem related to brake light has been reported for the 1999 Volvo S70. The most recently reported issues are listed below.
1999 Volvo S70 - continued rear brake, running light, and turn signal problems. I participated in the original recall campaign (00v405000) to replace the rear turn signal sockets and bulbs. To this day I continue to have problems with the rear turn signals, running lights, and brake lights. I frequently have problems with all of the rear lighting (brake, running, and turn signals). Recently, I found both rear turn signal and both rear brake lights were not functioning. I had to bang on the light housings to get the bulbs to make good contact with the sockets. The only relief I have found is to replace all rear bulbs every 3 months. Even then, I frequently have multiple bulb failures.