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1978 Honda CB400A Front Caliper Parts

Front-caliper service on the 1978 Honda CB400A can involve a piston, its sealing ring and the protective shaft boots. These are separate choices here. Identify the fitted caliper and have its condition assessed before deciding which parts the rebuild needs.

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Currently viewing Brake Caliper Rebuild Kits, Caliper Pistons, Bleed Screws

Honda motorcycle parts

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Honda CB900 CB750 CB650 caliper piston sealing ring 45108-300-003

Honda CB Caliper Piston Sealing Ring ~ Replaces 45108-300-003

$7.95 USD
29-0527
Replace your front caliper piston sealing ring with this Front Brake Caliper Piston Sealing Ring, replacing OEM #45108-300-003. Also fits the rear brake caliper...
Honda CB750 CB550 front brake caliper bleed screw rubber cap 45110-300-003

Honda CB Front Brake Caliper Bleed Screw Rubber Cap (Stock Type) ~ Replaces 45110-300-003

$3.95 USD
29-7018
Replace your front caliper bleed screw rubber cap with this Stock Type Front Brake Caliper Bleed Screw Rubber Cap, the same design as the...
Honda CB750 CB650 CB450 CB400 front caliper bleed screw 45224-413-003

Honda CB750 / CB650 / CB450 / CB400 Front Caliper Bleed Screw ~ Replaces 45224-413-003

$8.95 USD
73-0995
Replace your front caliper bleed screw with this Front Brake Caliper Bleed Screw, replacing OEM #45224-413-003.Key Features• Front brake caliper bleed screw• Replaces OEM...
Honda CB750C CB650C CB400 brake caliper piston 45107-413-003

1978-81 Honda CB750C / CB650C / CB400 Brake Caliper Piston ~ Replaces 45107-413-003

$69.95 USD
99-5101
Upgrade or restore your classic Honda motorcycle braking system with this high‑quality Brake Caliper Piston — precision engineered and Japanese made for reliable performance....
Honda CB750 CB650 CB400 front caliper shaft boots pk 4 45133-413-003

1978-79 Honda CB750 / CB650 / CB400 Front Caliper Shaft Boots Pk/4 ~ Replaces 45133-413-003

$19.95 USD
73-0835
Replace your front caliper shaft boots with these Front Brake Caliper Shaft Boots Pk/4. These rubber covers attach to the front brake caliper. Replaces...
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1978 Honda CB400A · Front Caliper Service Parts Buying guide

Order the individual pieces your caliper needs

The piston, sealing ring and four-boot pack provide distinct service options. Compare the caliper and references before purchase; none of these separate products should be treated as a complete caliper assembly.

Parts to consider

1978-81 Honda CB750C / CB650C / CB400 Brake Caliper Piston ~ Replaces 45107-413-003 Front caliper pistonJapanese-made replacement piston for reference 45107-413-003, listed for the 1978 CB400A.View part Honda CB Caliper Piston Sealing Ring ~ Replaces 45108-300-003 Caliper piston sealing ringSeparate front-caliper piston sealing ring for reference 45108-300-003.View part 1978-79 Honda CB750 / CB650 / CB400 Front Caliper Shaft Boots Pk/4 ~ Replaces 45133-413-003 Caliper shaft boots, pack of fourRubber shaft-boot pack replacing reference 45133-413-003. The supplied pack contains four boots.View part

Related parts: Front caliper bleed screw

Inspect before committing to a seal-only repair

The sealing ring is listed separately from the piston. Have the caliper and piston condition checked before deciding that a new seal alone is enough. Use the CB400A service manual for inspection limits and hydraulic assembly rather than relying on the availability of replacement parts.

Keep external pieces on the checklist

The shaft boots are supplied as a four-piece pack. A compatible bleed screw is available as a related item, separately from the boots. Check those pieces during the same inspection so the order reflects the complete work required without assuming they come with the piston.

Front Caliper Service Parts questions

Does the piston include its sealing ring?

The piston and sealing ring are separate products here, and the piston description does not specify an included seal. Order the sealing ring separately when the repair requires it.

Is this piston advertised as genuine Honda?

This is a Japanese-made replacement using reference 45107-413-003. Genuine Honda branding is not specified, so confirm the brand before ordering if an original Honda-branded part is important to your restoration.

How many caliper shaft boots are in the pack?

The stated pack contains four boots. Check the fitted caliper and the boots being renewed; the package quantity should not be confused with a claim about every caliper’s requirements.

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