Standard Ignition Air Brake Pressure Switch PS-142
Standard Ignition Air Brake Pressure Switch PS-142 - view 2
Standard Ignition Air Brake Pressure Switch PS-142 - view 3
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Standard Ignition Air Brake Pressure Switch PS-142 - view 5
Standard Ignition Air Brake Pressure Switch PS-142
Standard Ignition Air Brake Pressure Switch PS-142 - view 2
Standard Ignition Air Brake Pressure Switch PS-142 - view 3
Standard Ignition Air Brake Pressure Switch PS-142 - view 4
Standard Ignition Air Brake Pressure Switch PS-142 - view 5

Air Brake Pressure Switch for 1971-1979 International Scout II & More - Standard Ignition PS-142

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$37.99
MPN: PS-142
Item Package Quantity: 1
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Standard Ignition Air Brake Pressure Switch P/N:PS-142
Standard Ignition Air Brake Pressure Switch P/N:PS-142
$37.99

Keep the low-air warning circuit on your air brake system working with the Standard Ignition Air Brake Pressure Switch PS-142. It installs as a direct-fit replacement across a wide range of vintage International trucks — including the 1966-1971 International Scout, 1971-1979 International Scout II, 1974 International 100, and the M-series and 1000/1100/1200/1300 series — with 37 applications in total. See the Buyer's Guide tab for the complete vehicle list.

An air brake pressure switch is an electrical switch that senses the compressed-air pressure in the air brake system and opens or closes its circuit as that pressure changes. It is commonly wired to the low-air warning light and buzzer, signaling the driver when system pressure moves past the set point.

  • Function: monitors compressed-air pressure in the air brake system and switches an electrical circuit accordingly.
  • Direct-fit design: made to install on the listed International applications.
  • Signs it may need replacing: a low-air warning light or buzzer that stays on, fails to illuminate, or behaves erratically can indicate a failed switch — diagnose the cause before replacing.

Interchange: S4139 · PS184 · OP6709 · 19106674 · 471873C2 · 505027C1
Manufacturer part number PS-142 (also PS142)

This part cross-references / interchanges with the following part numbers:

S4139, PS184, OP6709, 19106674, 471873C2, 505027C1

Frequently Asked Questions

What does this air brake pressure switch do?

It senses compressed-air pressure in the air brake system and opens or closes an electrical circuit as pressure changes, commonly to operate the low-air warning light or buzzer.

Which vehicles does the PS-142 fit?

It's a direct-fit replacement for 37 vintage International applications from 1966 to 1979, including the Scout, Scout II, 100, and the M- and 1000-1300 series. See the Buyer's Guide tab for the full list.

What numbers does this switch interchange with?

It replaces S4139, PS184, OP6709, 19106674, 471873C2, and 505027C1. Its own manufacturer part number is PS-142.

What are signs this switch may need replacing?

A low-air warning light or buzzer that stays on, won't come on, or behaves erratically can point to a failed switch. Diagnose the cause before replacing it.

Does it work with air or brake fluid?

It's a pneumatic switch — it senses compressed-air pressure in the air brake system, not hydraulic brake fluid.

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