I am having trouble bleeding the brakes on a 1995 Pontiac grand am?

hi ....the brake system is a split system...approx.75% pressure to the front & 25% to the rear...this is controlled by the proportioning valve located several inch,s underneath the master cylinder...it also provide,s a Second function...it will cut off flow to either the front or rear in case of hydraulic failure...sometime,s when someone start,s to bleed the system the valve will interrupt flow sensing a loss of pressure ....if this has happened it will be necessary to recenter the valve..this can be a bit tricky...bleed front to rear & back again till the valve center,s [ gently] with ignition in on position the brake warning light will turn off when centered...then go to the valve & insert a lock pin in the valve so normal bleeding can take place...don,t forget to remove the pin after your done.....one other thing...are you bleeding a front caliper?...they have had a problem with the brake hose,s...they deteriorate on the inside preventing fluid from flowing....replacement is the only cure for that....good luck!

The two person job is a good way to do it, but there is an amazing tool out there that I recommend. It is a power bleeder - it looks like one of those bug spray / fertilizing bottles that you pressurize.

http://www.motiveproducts.com/

Check it out. I have one, and it is the way to go. All you do is fill the bottle with a bunch of fluid, install the custom cap on the m/c, pressurize it to what they recommend in the instructions, go to your bleeder, open it, and let the fluid flow!

it takes two people to do this properly first start with the right rear and with some one in the car open the bleeder screw and have them push the pedal to the floor and hold it then tighten the bleeder and repeat the process on each wheel. until all the air is out of the lines. make sure you check the fluid in the reservoir after each wheel.