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1974 Honda CB450K Caliper Replacement Scope & Separate Internal Repairs

Compare the caliper retained on your 1974 CB450K with the larger replacement and individual internal parts offered here. The replacement’s named contents can overlap a piston or seal repair. Identify the required components and possible final assembly before selecting standalone fittings and fasteners.

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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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1974 Honda CB450K · Brake Calipers, Pistons & Bleed Screws Buying guide

Resolve caliper identity before comparing complete and separate repairs

The aftermarket package uses reference 45100-390-405 and lists major components. Piston 45107-323-020 supplies explicit dimensions and an outer-lip instruction. The sealing ring, bleed screw and body bolts have separate references and contents; check each against the retained assembly and planned repair.

Parts to consider

Honda CB Front Brake Caliper Assembly ~ Replaces Honda OEM 45100-390-405 Aftermarket caliper with named replacement componentsEach caliper package references Honda 45100-390-405 and lists body, pads, piston, piston rubber, bleed screw, bolts and bleed cap. Compare the caliper removed. The description says final assembly may be required before installation; the component list alone does not settle delivery state.View part Honda CB Front Caliper Piston ~ Replaces 45107-323-020 Piston dimensions and outer lip statedPiston replaces Honda 45107-323-020 and measures 38.15mm diameter by 34mm height. Its 2mm outer lip faces the brake pad during installation. Compare the retained caliper and old piston; a supplied sealing ring is not itemized with the standalone piston.View part Honda CB Caliper Piston Sealing Ring ~ Replaces 45108-300-003 Separate ring for the caliper sealing locationPiston sealing ring references Honda 45108-300-003. Match the caliper and sealing location being renewed before buying. The ring description does not list a new piston, body or complete caliper package, leaving those repair decisions separate.View part

Related parts: Bleed-screw thread and seat confirmation · Two-bolt and two-washer package

Establish the replacement’s delivery state before planning the work

The assembly description names body, pads, piston, piston rubber, bleed screw, bolts and bleed cap, sold each. It also says final assembly may be required. Confirm that state and the retained attachment; a list of supplied components does not promise an installation-ready assembled caliper.

Use piston details without expanding standalone package contents

The piston’s 2mm outer lip faces the pad, and its separate description does not itemize a seal. Ring 45108-300-003 is another repair choice. Body-fastener set 90165-323-000 explicitly provides two bolts and two washers, without identifying all other mounting or adjustment hardware as included.

Caliper components and replacement planning

How should I plan the work for a replacement caliper package?

Compare the caliper and mounting retained, read the full supplied list and confirm the delivery state. The description says final assembly may be required before installation. Account for that work before treating the package name as proof that the components arrive ready to fit.

What should I confirm if the piston size matches but the old part has a different outer edge?

Compare reference 45107-323-020 and the 38.15 × 34mm dimensions with the removed piston. The offered part specifies a 2mm outer lip facing the pad. Resolve the retained caliper and any other required piston details before relying only on matching diameter and height.

How do I choose the bleed fitting for a caliper with uncertain replacement history?

Identify the retained caliper and fitting, then compare reference 45224-579-013. Full thread and seat dimensions are not supplied in the standalone description. Confirm those missing details where needed, and assess the rubber cap separately because it is not itemized with this screw.

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