Rusty truck frame rail with air brake valve, linkage arm and whi…
Close-up down onto the rusty frame rail of a derelict heavy truck, showing the air brake ride-height or brake proportioning valve with its linkage arm bolted to the rail and white-jacketed air lines running to a brass tee fitting. Below sit an air tank, spring brake chambers and rubber lines, with moss and weeds growing over the parts.
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