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International S112 Air Brake Pressure Switchs

International S112 Air brake pressure switchs

Starting at $10.95, AutoBuffy stocks 1 air brake pressure switches from Standard Ignition. This switch monitors air pressure in your brake system and signals the dash warning light or cuts power to critical circuits when pressure drops too low. A failed switch leaves you flying blind on brake system health — a serious safety risk on any air-braked vehicle.

Signs your International S112 needs a new air brake pressure switch

  • Low air pressure warning light stays on even after the system builds to normal operating pressure
  • Low air pressure warning light never illuminates, even when the system is clearly undercharged
  • Brake warning buzzer sounds continuously or fails to sound at all during a cold start build-up cycle
  • Transmission or PTO fails to engage because the pressure switch isn't sending the required signal to allow operation
  • Air dryer or compressor governor behaves erratically due to a false pressure signal from the switch
  • Visual inspection reveals corrosion, cracked housing, or brake fluid or air line residue around the switch body

Which air brake pressure switch should you buy for your International S112?

The main decisions are thread size and port configuration, rated activation pressure (PSI set point), and whether the switch is normally open or normally closed. Buying a switch with the wrong PSI rating means your warning system triggers at the wrong threshold — either masking a real problem or creating nuisance alarms. Always confirm the OE pressure rating and electrical connector type before ordering.

OE-equivalent replacement
Best for
Restoring factory warning thresholds and connector fit on a International S112 used in normal service
What you get
Matched PSI set point, correct thread pitch, and plug-and-play connector — no adaptation needed
Heavy-duty / upgraded switch
Best for
International S112 in severe-duty, high-cycle, or extreme-temperature service such as construction or refuse
What you get
Reinforced diaphragm, wider temperature rating, and longer service life under constant pressure cycling
Normally-open (NO) switch
Best for
Warning-light circuits that ground through the switch to illuminate on low pressure
What you get
Circuit stays open at normal pressure; closes and triggers the warning when pressure falls below the set point
Normally-closed (NC) switch
Best for
Power-cut or relay circuits that require the switch to open on low pressure to interrupt a function
What you get
Circuit stays closed at normal pressure; opens to cut the signal when pressure drops — common on transmission interlocks

Air brake pressure switchs brands we stock for your International S112

Standard Ignition
1 option · from $10.95

Replacing an air brake pressure switch on a International S112

Easy⏱ 30–60 minutesOpen-end or combination wrench sized to the switch hexThread seal tape (PTFE) rated for compressed airDrain valve tool or 3/8-inch drive ratchet to bleed the tankElectrical contact cleaner and dielectric greaseMechanical air pressure gauge (for verification)

Before starting, drain the affected air tank to zero pressure and verify with a gauge — never remove a fitting under pressure. Thread the new switch in by hand first to avoid cross-threading, then snug it with a wrench using PTFE tape on the threads; overtightening can crack the switch body. Reconnect the electrical connector, rebuild system pressure, and confirm the warning light extinguishes at the correct pressure threshold before returning the vehicle to service.

Frequently asked questions

How much does it cost to replace air brake pressure switches on a International S112?
Parts start at $10.95 at AutoBuffy. The switch itself is the main cost — professional shop labor for diagnosis and replacement is typically modest because access is usually straightforward. DIY replacement is realistic for anyone comfortable working around air lines, and it brings the total cost down to just the part price.
Can I drive my International S112 with a faulty air brake pressure switch?
You should not. A failed switch means you have no reliable warning if brake system air pressure drops to an unsafe level. On air-braked vehicles, low pressure can cause brake failure with little or no warning. Most jurisdictions also flag a non-functional brake warning system as an out-of-service defect during roadside inspections.
How do I know if the pressure switch is bad or if I actually have a low air pressure problem?
Connect a mechanical gauge directly to the air line at the switch port and compare the actual pressure reading to the point at which the warning activates. If the gauge shows normal system pressure while the warning is still on, the switch is likely faulty. If pressure is genuinely low, diagnose the air system before replacing the switch.
What PSI does an air brake pressure switch activate at?
Federal Motor Vehicle Safety Standards require the low-pressure warning to activate at or before 60 PSI on most air brake systems, but OE set points vary by application — some are calibrated between 55 and 70 PSI. Always match the replacement switch to your vehicle's original specification rather than using a generic pressure rating.
How long does an air brake pressure switch last on a International S112?
Service life varies widely depending on duty cycle, moisture exposure, and vibration. Switches on vehicles that cycle the air system many times per day wear faster than those on lightly used equipment. Inspecting the switch during every major brake service interval is a practical way to catch early corrosion or diaphragm fatigue before it causes a failure.
Are air brake pressure switches universal or vehicle-specific?
They are not universal. Thread size, port diameter, electrical connector type, PSI activation point, and normally-open versus normally-closed configuration all vary by application. Using the wrong switch can result in a warning that triggers at the wrong pressure or a connector that won't mate. Always verify all specifications against your International S112's OE part requirements.

Shop air brake pressure switchs by year for the International S112

1957

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Air brake pressure switchs for other International models

International 1210International A132International S122International A130International AB120International S100