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1972 Honda CB450K Caliper Replacement & Matched Service Components

Identify the caliper being retained on your 1972 CB450K before choosing its piston or sealing ring. An aftermarket assembly offers a larger replacement scope with named components. Compare those contents and its possible final-assembly requirement against a focused repair to the caliper already fitted.

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

Honda motorcycle parts

Choose your model and year to see parts listed for your bike.

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 CB500 CB450 front caliper adjuster set 45117-341-700

Honda CB750 / CB550 / CB500 / CB450 Front Caliper Adjuster Set ~ Replaces 45117-341-700

$13.95 USD
29-7016
Restore your front caliper adjuster with this Front Brake Caliper Adjuster Set, including adjusting bolt, spring, washer, and nut. Replaces OEM #45117-341-700 (bolt), #45119-300-020...
Honda CB750 CB550 CB500 front brake caliper bleed screw 45224-579-013

Honda CB Front Brake Caliper Bleed Screw ~ Replaces 45224-579-013

$8.95 USD
73-0993
Replace your front caliper bleed screw with this Front Brake Caliper Bleed Screw, replacing OEM #45224-579-013.Key Features• Front brake caliper bleed screw• Replaces OEM...
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Honda CB550 CB500 CB450 CB400 CB360 front caliper piston 45107-323-020

Honda CB Front Caliper Piston ~ Replaces 45107-323-020

$21.78 USD
29-0058
Replace your front brake caliper piston with this Front Brake Caliper Piston, 38.15mm diameter x 34mm height, replacing OEM #45107-323-020. The side with the...
Honda CB750 CB550 front brake caliper bolt and washer set 90165-323-000

Honda CB Front Brake Caliper Bolt & Washer Set ~ Replaces 90165-323-000

$12.50 USD
73-1027
Replace your front caliper bolts and washers with this Front Brake Caliper Bolt & Washer Set. Includes 2 bolts and 2 washers. Replaces OEM...
Honda CB550 CB500 CB450 front brake caliper assembly 45100-390-405

Honda CB Front Brake Caliper Assembly ~ Replaces Honda OEM 45100-390-405

$119.95 USD
33-0039
Replace a worn, seized, damaged, or missing front brake caliper with this aftermarket full caliper assembly for Honda CB models. It is a replacement...
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1972 Honda CB450K · Brake Calipers, Pistons & Bleed Screws Buying guide

Compare a matched piston repair with replacement coverage

The piston uses reference 45107-323-020, with 38.15mm diameter, 34mm height and a documented outer lip. The seal is separately identified. The aftermarket assembly references 45100-390-405 and includes several components that would otherwise be separate repair choices.

Parts to consider

Honda CB Front Caliper Piston ~ Replaces 45107-323-020 Piston with documented lip and dimensionsPiston referencing Honda 45107-323-020, 38.15mm diameter and 34mm height. The stated 2mm outer lip faces the pad during installation. Match the retained caliper and removed piston; a seal is not listed as supplied.View part Honda CB Caliper Piston Sealing Ring ~ Replaces 45108-300-003 Replacement caliper piston sealing ringSeal referencing Honda 45108-300-003. Compare the caliper and sealing location being serviced. The listing concerns the ring, without naming a piston, bleed fitting or entire caliper as part of the purchase.View part Honda CB Front Brake Caliper Assembly ~ Replaces Honda OEM 45100-390-405 Aftermarket caliper with major componentsAssembly referencing Honda 45100-390-405, sold each. Lists body, pads, piston, piston rubber, bleed screw, bolts and bleed cap. The description says final assembly may be required before installation; compare the original caliper and reference.View part

Related parts: Caliper adjusting bolt package · Two bolts and two washers · Front caliper bleed-fitting check

Keep the piston’s documented features tied to that part

The separate piston description states that its 2mm outer lip faces the brake pad. Use the specified dimensions and reference to identify the component before planning service. No seal is listed as supplied with it; the sealing-ring purchase and the full caliper’s contents need separate comparisons.

Identify which caliper fastener package is needed

The body-fastener set contains two bolts and two washers under reference 90165-323-000. The adjustment set instead contains bolt, spring, washer and nut, with bolt reference 45117-341-700. Check the location being serviced so that the similar category names do not obscure those different contents.

Caliper contents and individual service questions

Does the assembly description promise delivery ready to install?

It expressly notes that final assembly may be required. The named contents are body, pads, piston, piston rubber, bleed screw, bolts and bleed cap. Confirm the delivery state and compare the original caliper and reference before planning the replacement work.

Should I order separate pads and a bleed cap with the complete caliper?

Both pads and bleed cap are listed among the assembly’s contents. Compare the planned work with that list before adding those components again. The standalone bleed-screw description does not identify a cap as supplied, so that smaller repair needs its own contents decision.

Can the bleed screw be chosen for another caliper from the year alone?

The standalone screw references 45224-579-013 for the stated front-caliper applications. Compare the actual fitting and caliper. A full thread and seat drawing is not provided, so confirm any missing dimensions needed by a replacement caliper before choosing it.

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