The valve is pressure sensitive and automatically moves from the applied (over the road position) to the exhaust position (thus applying the parking brakes) if total system pressure (both front and rear axle reservoirs) drops below 20 to 30 psi
Alliance Tapered Bearing Cone - N Trailer Axle (Inner)
The 570 Slack Reducing Coupling May Be Your Solution
Feature Highlights: No Plug | Fit 'N Forget S
NMFC Code: 069100-09
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