The pre-70's cars had a single piston, single reservoir system.
Anything fails, you have nothing.
Then they went to a dual chamber, dual reservoir system.
Front and rear circuits, you only lost brakes on one end with a single failure.
Sometime around 1990, they started using a single reservoir to feed
the dual piston. Dumbest fudging thing I ever saw.
You have two seperate systems, but the are supplied
from a single place.
If you are driving when it pops a leak, you get maybe two brake
pumps, then...No brakes!
If the leak comes when it's sitting, or if you cause a leak by pressing the
pedal, but don't notice, it will siphon out. No brakes, no warning light!
This was done (I think) to save weight, and money by using that cheap
ass plastic tank.
This isn't GM specific either.
The whole thing I wrote applies across the industry as far as I know.
Not sure about German cars.
Last edited by Dillonbuck; 01/03/21.
