The Nissan Frontier Brake Proportioning Valve serves to stabilize the pickup by preventing the rear wheels from locking when you step on the brake. While a panic stop occurs, the Brake Proportioning Valve reacts to the increasing master-cylinder pressure. At that pressure, a spring slides a piston that seals an internal port, restricting fluid to the rear drums while full force goes to the loaded front discs. The Brake Proportioning Valve on many Frontier models is located close to the master cylinder or inside the combination block with shared lines for compactness and ease of servicing. Over the years, there were two different styles that appeared: the fixed Brake Proportioning Valve on regular trims and the adjustable or lever version. The fixed unit is factory set for daily Nissan use, while the adjustable unit allows owners to tweak the rear pressure via knob or linkage whenever Frontier payload or tire size changes. When a Brake Proportioning Valve jams up with age, regardless of the type, it will no longer be able to shift pressure. This is likely to cause sudden uncommanded skids on the part of the Nissan pickup truck. Similarly, jammed parts can be caused by corroded cap screws and trapped debris.
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