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1978 Honda CB400A Brake & Oil Switches

The CB400A uses different switches for the front brake, rear brake and oil warning light. Identify which circuit needs attention before ordering. The front switch has a specific 1978 application, while the other choices serve their own distinct locations and signals.

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Honda CB750 CB550 CB500 CB450 CB400 rear brake light switch

Honda CB Rear Brake Light Switch

$10.33 USD
12-0008
Replace your rear brake light switch with this Rear Brake Light Stop Switch. Exceptionally broad fitment across the SOHC CB750 lineup and virtually the...
Honda CB900 CB750 CB650 CB550 CB500 oil pressure switch 37240-P13-013

Honda CB Oil Pressure Switch ~ Replaces 37240-P13-013

$23.95 USD
73-0825
Replace your oil pressure switch with this Oil Pressure Switch, replacing OEM #37240-P13-013.Key Features• Oil pressure switch• Replaces OEM #37240-P13-013• Honda part name: Switch...
Honda CB1100 CB1000 clutch lever brake light switch 35330-413-003

Honda CB Clutch Lever Brake Light Switch ~ Replaces 35330-413-003

$15.95 USD
29-7029
Replace your front clutch lever safety stop switch with this Clutch Lever Stop Switch, replacing OEM #35330-413-003. This is the switch that allows the...
Honda CB400A CB400TII front brake light switch assembly 35340-413-013

1978 Honda CB400A / CB400TII Front Brake Light Switch Assembly ~ Replaces 35340-413-013

$24.95 USD
12-0040
Replace your CB400A or CB400TII front brake stop switch with this Front Brake Stop Switch Assembly, replacing OEM #35340-413-013.Key Features• Front brake stop switch...
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1978 Honda CB400A · Brake & Oil Switches Buying guide

Identify the switch by what it operates

Front and rear brake-light switches are separate selections. The oil-pressure switch serves the warning-light circuit. Match the part at its location and follow the Hondamatic wiring information, particularly around altered controls.

Parts to consider

1978 Honda CB400A / CB400TII Front Brake Light Switch Assembly ~ Replaces 35340-413-013 Front brake-light switch1978 CB400A application; replaces reference 35340-413-013.View part Honda CB Rear Brake Light Switch Rear brake-light switchReplacement rear brake stop switch with an explicit 1978 CB400A application.View part Honda CB Oil Pressure Switch ~ Replaces 37240-P13-013 Oil-pressure switchReplacement warning-light switch referencing 37240-P13-013.View part

Keep front and rear brake switches separate

The featured front assembly references 35340-413-013 and explicitly covers the 1978 CB400A. The rear stop switch is a different component at the rear brake control. Check which brake operation fails to illuminate the lamp before choosing the corresponding part.

Treat an oil warning as a system check

The oil-pressure switch references 37240-P13-013. A warning light cannot by itself tell you whether the switch, wiring or oil-pressure condition is responsible. Use the relevant Honda checks before replacing parts, and investigate a pressure warning before further riding.

Brake & Oil Switches questions

Can one brake switch replace the other?

Choose by position. The front assembly and rear stop switch have separate applications and mounting arrangements. Match the switch on the motorcycle rather than ordering either one simply because both operate the brake light.

Does a replacement oil switch prove the oil system is healthy?

No. It replaces the warning-light switch only. A persistent warning needs the Honda diagnostic checks for the oil system and wiring; replacing a switch is not confirmation of adequate oil pressure.

What should I check on a bike with changed hand controls?

Identify the fitted control assembly and its switch mounting, then compare the connector and circuit. The CB400A’s parking-brake lever should not be treated as a conventional manual-clutch lever when selecting switch parts.

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