It would have drum brakes on it with an upper and lower wheel cylinder on the front. When you say you have no brakes, does that mean none at all or just none in the front. If it has them on one end but not the other, then it might have a proportioning (safety) valve that is off center. You can look up on the internet how to get it back to center if that's the case. For part numbers to repair it with, you can go to the raybestos web sit and look them up there.
Try bleeding the system starting with the wheel furthest (by length of brake line) from the brake pedal first and finishing at the closest wheel. If while pressing the brake pedal air bubbles appear in the master cylinder or the level rises and falls in the reservoir, the master cylinder needs work.
Check you brake fluid and lines. It may be as simple as bleeding your brakes.
A 2002 Chevy Tahoe uses the standard brake fluid in passenger vehicles with power brakes. It is known as DOT3 brake fluid.
It could be low on brake fluid, a sign of trouble. Have the brakes checked SOON!
Siphon it out. Do not drive or pump the brakes. Replace the brake fluid. This will cause the brakes to fail.
Worn brake shoes or pads. A leaking brake pipe. Low brake fluid. Air in the brake fluid pipe.
This is a sign that you need to have the brakes inspected, soon. Worn brakes causes the brake fluid reservoir level to drop causing the brake and abs lights to come on.
When a brake line is leaking on the Chevy Venture the brake line should be replaced as soon as possible. A leak, however small, can cause hydraulic fluid to escape the brake line which will cause a loss in brake pressure. The brakes should be bled of air after the new line is put in to remove gaps in brake pedal pressure.
Sticking caliber. Flush the brake system and install fresh brake fluid, then bleed the brakes. If that does not help, replace both calibers and brake pads on the axle where the brakes are grabbing.
A rotted brake line, a leaky front caliper, a leaky rear wheel cylinder, a leaky master cylinder,
it might not have enough brake fluid or your ABS is going bad. i would take it to a shop cause that can be serious.
If you are losing fluid and the pedal is low, you have a brake fluid leak.
Does this Blazer have four wheel disc Brakes? NEW ANSWER: There's no reason to bleed brakes if you did not open the system.( where brake fluid came out )