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Bendix  |  SKU: 802938

802938 | Genuine Bendix® Tractor Protection Brake Valve TP-5

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Part Number: 802938
Condition: Used In Good Condition
Manufacture/Brand: Bendix
Relared Part Numbers: TWDBEN802938, 745-802938, BAN802938

Description:
A Tractor Protection Valve (TPV) is a critical air brake component found on semi-trucks (tractors) that tow trailers. Its main purpose is to protect the tractor’s air brake system in case the trailer loses air pressure or disconnects unexpectedly. Tractor Protection Brake Valve TP-5

Fits For Kenworth T880, T680, Peterbilt 579

Specifications: 

Mounting: Ø .34 IN (4x) 
Mounting Type: Firewall 
Tractor Control Port (Primary): 3/8-18 NPT 
Tractor Control Port (Secondary): 3/8-18 NPT 
Trailer Control Port: 1/4-18 NPT 
Stop Light Switch Port: 1/4-18 NPT (Plugged) 
Stop Light Switch Port (Firewall): 1/8-27 NPT 
Tractor Protection Port: 3/8-18 NPT (Plugged) 
Tractor Protection Port (Firewall): 1/4-18 NPT 
Trailer Supply Port: 1/2-14 NPT 
Trailer Service Port: 1/2-14 NPT 
Exhaust Port: Dust Shield 
Service Line Opening Pressure: 50 PSI (MAX) 
Service Line Shut-Off Pressure: 10 PSI (MIN) 
Maximum Operating Temperature: 221 °F (105 °C) 
Minimum Operating Temperature: -40 °F (-40 °C) 


Purpose:

When you're driving a truck with a trailer:

  • The tractor supplies air to the trailer's brakes through gladhand connectors (red = emergency, blue = service).

  • If the trailer disconnects, or loses pressure, air would otherwise escape from the tractor — disabling brakes on both tractor and trailer.

The Tractor Protection Valve:

  • Seals off the tractor’s air system to prevent air loss

  • Automatically applies trailer emergency brakes if air pressure drops too low

  • Allows control over trailer brake supply and emergency lines


Signs of a Bad Tractor Protection Brake Valve:

Tractor loses air when trailer disconnects

Trailer brakes don’t engage during emergency
Air constantly leaks from gladhand connections
Trailer supply knob doesn’t pop out on pressure loss
Fails leak-down or build-up test during DOT inspection

About the Manufacturer – Bendix:

Bendix is a leading manufacturer of air brake systems, safety technologies, and control components for commercial trucks, buses, and trailers. Known for innovations in braking, stability, and traction control, Bendix supplies OEM and aftermarket parts across North America. It is a subsidiary of Knorr-Bremse, a global leader in braking systems.

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