Description
065145-G – BOBTAIL VALVE
PART NUMBER(S):
Fleet Products: 065145-G
OE: 065145, 65145, 065145N
Automann: 170.065145
DESCRIPTION:
Model: Bobtail Brake Proportioning Valve
Vehicles: Tractor-only (bobtail) operation for heavy-duty trucks
• Valve Type: Combination relay/proportioning valve
• Function: Combines standard relay valve (lower body) with proportioning valve (upper body) to reduce rear brake pressure during bobtail operation
• Actuation: Air
• Crack Pressure: 4.0 PSI standard
• Supply Port: 1 × 1/2" NPT
• Delivery Ports: 2 × 3/8" FPT (side), 2 × 3/8" FPT (bottom)
• Control Port: 1 × 1/8" NPT
• Service Port: 1 × 1/4" NPT
• Mounting: Includes bracket (hole dia. 5/16", standard for class)
• Material: Aluminum body with integral exhaust cover
• Weight: Approx. 2.0–2.5 lbs
• Performance/Technology: Rapid brake response in unloaded (tractor-only) mode; prioritizes airflow and proportional control to prevent wheel lockup
• System Integrity: Designed specifically for tractor brake systems where trailers are not connected
• Compatibility: Interchangeable with a wide range of OEM part numbers and air brake configurations
Applications:
Used in heavy-duty truck air brake systems to optimize braking during bobtail operation. Provides safe, controlled reduction in rear axle brake force when operating without a trailer, preventing lockup and maintaining stability. Ideal for fleets prioritizing brake efficiency and safety in solo tractor movement.
CROSS-REFERENCE(S):
065145, 065145BXW, 065145CX, 065145X, 106929, 107630, 108298, 108504, 108504X, 108777, 108940, 109042, 109042X, 109104, 109104X, 15555804, 15635925, 1619734C91, 170.065145, 2000421C91, 2003978C91, 3081426, 3500192, 3508845C91, 3541456C1, 3576464C1, 3578105C1, 3578105C2, 3584116C2, 3584117C1, 3584117C2, 3606770C1, 3606770C2, 3902993C1, 3902993C2, 3902993C3, 3945988, 3949428, 4C4Z-18124-HB, 5002112, 5002113, 5002187, 6127088C1, 65145, 65145N, 65145P, 65145RX, 66422, 66445, 670-SC517, 745-065145, 745-65145N, 745065145, 74565145, 74565145N, 801797, 83163, 83167, 83175, 85929, 90020596, AA615, AMS65145, AM170065145, APL-100870, AT-811, AT065145, BAN065145, BAN65145N, BBH-RB-65145, BBHRB65145, BEN-065145, BEN65145N, BER-065145, BP-R1, BX065145, BX106929, BX107630, BX65145N, BXK065145, BXW065145, BW 065145, BW065145, BW106929, BW107630, BW65145N, E-BN065145, E-BN065145N, FC065145, FC4Z-18124-HB, FLTBV145, GTA-065145, H065145, K065145, L3081426, OE13402S, OR65145X, R955065145, R955065145X, RB-65145, RB65145, S-C517, S-3099SS, SC517, SM-3099ST, TR065145, TV065145, TWDBEN65145N, W:BW-065145, WA65145, ZAC065145, 0587-065145P, BC516GRP, 13AV4589, 20QE41083M3, 20QE41083M4, 20QE4108M2, 20QE4108M4, F2HZ2A449A, F3HT2A449AA, 070-65145RXA cross-reference listing means this part may be a compatible replacement for these part numbers based on OEM or distributor data.
IMPORTANT INSTALLATION NOTES:
✔ Mount valve on tractor chassis using supplied bracket
✔ Ensure correct orientation of side and bottom delivery ports
✔ Use proper thread sealant on NPT connections; do not overtighten
✔ Verify 4 PSI crack pressure compatibility for bobtail-specific performance
✔ Confirm full air system recharge before initial testing after install
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