Currently own a 1996 volvo 850 glt wagon, N/A setup. with 213K on it.

I just started to experience the following this week.

-When driving along at varying speeds the steering wheel will jerk to the left randomly. What is the cause of this?

-Brake issue
When I get going first thing in the morning at 1:30 am and I go to apply the brakes for the first time on the ride the brake pedal goes to the firewall and the car keeps on going, not slowing at all. There are no noises what-so-ever when this happens. What could be the cause?

-replace wiper motor
How to repair/replace passenger front headlight wiper motor. The unit stopped working when I took out a deer about a month ago with the car.

-Driver side seat
How to fix the seat heat on the unit. It is not working at all.

-Windshield wiper issue
When I go and switch on the windshield wipers they will not move at first, then when I put the switch onto the highest speed the wipers start to work. Occasionally the wipers will stop mid stream.
What is causing this and how to fix?