Have someone pump the brake pedal sever times then keep the pedal down. Crack open the bleeder on the master cylinder just a bit. Fluid will come out (or air.) When the pedal has reached the floor close the valve. Pump pedal and repeat till no air comes out for two or three tries. Do the same at each wheel cylinder.
Leave it to the pros you have to key the cylinder when it is replaced and it involves tiny springs and tumblers if you mess up you key will not work
First thing I would look for is a loose vacuum line to the engine, sucking in the extra air. If the brakes feel "hard", look on the brake booster (the big round thing that the master cylinder is attached to) for a disconnected vacuum source line.
beside the brake booster on the firewall, under the AC lines (if equipped)
the only engine that comes in the venture vans is the 3400 (3.4L) GM V6
How bleeding brake .01 chevy venture. Master cylinder replace
I've got a better question, why is this question in the Chevy venture forum ?
As you are looking at the engine it is the first plug on your left.
IF ITS NOT LOW ON FLUID THEN THE PUMP NEEDS TO BE REPLACED. IF ITS NOT LOW ON FLUID THEN THE PUMP NEEDS TO BE REPLACED.
Back side of the engine, middle.
I also have a 2000 Venture same problem. Solution was tire balance weights fell off. They were replaced and problem resolved but....the tires were worn irregularly on the inside and I had them replaced.
ball joints cannot be tightened. if they re worn and have play in them, they need to be replaced
The cylinder head bolt torque for a 1999 Chevy Venture is 44 ft lbs. If you have a GM special service tool # J36660A, use that to turn the bolts an additional 95 degrees.