What you might be encountering are related components that *could* be confused for a "dump valve":
* Proportioning Valve: This valve is crucial for proper braking. It adjusts the braking force between the front and rear wheels, preventing rear-wheel lockup (especially important in SUVs). It's usually located within the brake system lines, often near the master cylinder, and you won't see a readily accessible "valve" as you might imagine.
* ABS (Anti-lock Braking System) Module/Pump: If your Suburban has ABS (it likely does, for a 1996 model), the system includes a hydraulic control unit that modulates brake pressure to individual wheels to prevent wheel lockup during braking. This module is part of the brake system, but isn't a simple "dump valve." It's typically located under the hood or near the brake master cylinder, often encased and not easily accessible for servicing.
* Brake Master Cylinder: This is the primary component responsible for distributing brake fluid to the rest of the system. While not a "dump valve," a leak or malfunctioning master cylinder could lead to loss of brake pressure, possibly misinterpreted as a "dump valve" issue.
If you're experiencing brake problems, it's essential to get a proper diagnosis from a qualified mechanic. Describing the specific problem (e.g., brake pedal going to the floor, spongy brakes, uneven braking) will help them pinpoint the actual cause. Using the term "dump valve" might not help them understand the situation.
