1997 tahoe brakes not working properly.?

I have been trying to figure out this brake system. First of all, the rear brakes stopped working, there was no fluid at all. I bled the abs unit, adjusted the rear drum brakes, and inspected the lines, finally the rear was working. They are still working and it was fine for awhile. There is a hissing sound when you apply the brake, and it shifts the motor down when you apply the brake. i can hear a vacuum leak under the hood at the back of the motor, but i can't seem to find it. The hissing sound and the way the motor changes when the brake is applied, I'm sure it's a vacuum leak. Anyone have any common problems and have had solutions as to where the leak may be?
1997 tahoe brakes not working properly.?
I gather the brakes are working ok ? Be sure master cylinder is kept full when bleeding. The hissing is definitely the vacuum booster the way you describe the engine stalling and the location of the sound. ABS brakes are bled as regular brakes but some systems require a certain order to bleed them.
1997 tahoe brakes not working properly.?
power brakes use vacuum from the manifold and there is a fat hose that comes from the engine manifold to the brake booster the end of some of these tend to break or crack and need replacing shouldnt be too much money and you can do it in 5 minutes with a pair of pliers if thats where the leak is ..but it sounds like that may be where its coming from
I really cant help you i have no idea what could be going on unless i looked at it myself but you said you bled your brakes and you have abs well some on some makes and i dont know if the tahoe is one of them but some abs units require a scanner so you can actuate the vavle inside the hcu i guess and then you can properly bleed your brakes and really get the air all out you might want to look up the bleeding procedure other than that i have no ideas man
Brake booster leak that's why you can't find it
It is normal when u hear ur brakes hissing its telling you there is compression in the master cylinder and ur brakes are working fine. The Vacuum Leak is probably coming from around the throttle body.

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