I am having problems with my brakes and manual gear shifting in my 1982 E28 528iA car. The brake pedal falls to the floor when you apply the brakes. It does not keep the brake pressure firm for long. When I am standing on a slope, by the time the pedal reaches the floor, the car will begin to roll. I have to keep apply the brakes again and again to stay in one place. Is this why the clutch is also difficult to engage. Usually, when I start the car in the morning or after parking for long, the gear will shift normally. But after driving it for sometime, it becomes difficult to engage. I will appreciate any advise on how to solve these problems. Thanks.