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1973 Honda CB450K Caliper Package Contents & Piston Service

Decide whether the caliper retained on your 1973 CB450K needs matched internal parts or a larger replacement package. The assembly lists several service components and may require final assembly. Compare the removed piston, sealing location and fasteners before combining either repair scope with separate fittings.

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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 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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1973 Honda CB450K · Brake Calipers, Pistons & Bleed Screws Buying guide

Identify the retained caliper and compare repair scope

The aftermarket assembly references 45100-390-405. The separate piston references 45107-323-020 and gives diameter, height and an outer-lip instruction. Sealing ring, bleed screw and body-fastener set have separate contents; compare those with the full assembly before ordering overlapping parts.

Parts to consider

Honda CB Front Brake Caliper Assembly ~ Replaces Honda OEM 45100-390-405 Caliper replacement with listed major partsAftermarket assembly referencing Honda 45100-390-405, sold each. Contents name body, pads, piston, piston rubber, bleed screw, bolts and bleed cap. Final assembly may be required before installation; compare the original caliper and reference.View part Honda CB Front Caliper Piston ~ Replaces 45107-323-020 Front piston with stated outer-lip featureReferences Honda 45107-323-020, with 38.15mm diameter and 34mm height. The stated 2mm outer lip faces the pad during installation. Match the removed piston and retained caliper; the description does not itemize a supplied sealing ring.View part Honda CB Caliper Piston Sealing Ring ~ Replaces 45108-300-003 Sealing ring for a matched piston repairPiston ring referencing Honda 45108-300-003. Compare the retained caliper and sealing location before selecting it. No replacement piston or complete caliper body is named in this ring’s contents.View part

Related parts: Caliper bolt and washer quantities · Standalone bleed-screw fit check

Confirm what the replacement assembly means for the work

The package names body, pads, piston, piston rubber, bleed screw, bolts and bleed cap, and sells each. The description says final assembly may be required before installation. Check that delivery state and the retained mounting rather than treating a complete component list as a promise of installation-ready assembly.

Compare piston details and fasteners without merging their coverage

The piston specifies a 2mm outer lip facing the pad, but does not itemize a supplied seal. The body-fastener set explicitly supplies two bolts and two washers under 90165-323-000. Match the removed components and their locations before adding a sealing ring or fastener package to the repair.

Caliper package and retained-component questions

What distinguishes the piston purchase from the assembly’s listed piston coverage?

The standalone piston provides reference 45107-323-020, 38.15 × 34mm dimensions and the outer-lip detail for comparison with the retained part. The assembly already lists a piston and piston rubber. Match the repair scope and contents before buying both for the same location.

How can I check a bleed screw when the caliper was replaced earlier?

Compare the retained fitting with reference 45224-579-013 and confirm the thread and seat details required. The standalone description supplies no full fitting drawing. Its motorcycle application cannot establish the connection on every caliper substituted during previous work.

Does the body-fastener set cover all hardware for a larger caliper repair?

It expressly supplies two bolts and two washers under 90165-323-000. No complete mounting or adjustment-hardware package is itemized. Inspect the retained hardware at other locations and identify those separate needs rather than treating this four-piece set as every caliper fastener.

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