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1970 Honda CB450K Caliper Assemblies & Individual Service Parts

Choose between retaining the fitted caliper and replacing the assembly on your 1970 CB450K. The complete aftermarket caliper lists a broad set of included components, while the piston, ring and bleed screw are separate service choices. Compare the repair scope before buying overlapping parts.

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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 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 CB750K CB450K front caliper bleed screw 45109-300-003

1969-76 Honda CB750K / CB450K Front Caliper Bleed Screw ~ Replaces 45109-300-003

$8.95 USD
29-7017
Replace your front caliper bleed screw with this Front Brake Caliper Bleed Screw, replacing OEM #45109-300-003.Note: we also carry the stock-type bleed screw rubber...
Honda CB750K CB450K front caliper piston 45107-300-003

1969-76 Honda CB750K / CB450K Front Caliper Piston ~ Replaces 45107-300-003

$49.95 USD
29-0526
Replace your early CB750K or CB450K front caliper piston with this Front Brake Caliper Piston, 38.15mm diameter x 34mm length, replacing OEM #45107-300-003.Key Features•...
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 CB750K CB450K front brake caliper assembly 45100-341-003

1969-76 Honda CB750K / CB450K Front Brake Caliper Assembly ~ Replaces Honda OEM 45100-341-003

$139.95 USD
33-0040
Aftermarket front brake caliper assembly for Honda CB750K and CB450K front disc brake service. This complete assembly replaces Honda OEM #45100-341-003 and is a...
Honda CB750K CB450K front caliper bolts (pk 2) 90165-300-023

1969-76 Honda CB750K / CB450K Front Caliper Bolts (Pk/2) ~ Replaces 90165-300-023

$12.95 USD
73-1026
Replace your front caliper bolts with these Front Brake Caliper Bolts Pk/2, replacing OEM #90165-300-023.Key Features• Front brake caliper bolts• Pack of 2• Replaces...
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1970 Honda CB450K · Brake Calipers, Pistons & Bleed Screws Buying guide

Check the complete package before choosing individual pieces

The assembly is sold each and references Honda 45100-341-003. The separate piston specifies 38.15mm diameter and 34mm length; the seal ring has its own reference. Adjuster hardware and a pack of two body bolts address different fasteners.

Parts to consider

1969-76 Honda CB750K / CB450K Front Brake Caliper Assembly ~ Replaces Honda OEM 45100-341-003 Complete aftermarket caliper assemblySold each, referencing Honda 45100-341-003. Includes both body halves, pads, piston, seal/ring, piston cap, bleed screw and cap, bolts and clip. Match the fitted brake arrangement and review those contents before adding separate caliper parts.View part 1969-76 Honda CB750K / CB450K Front Caliper Piston ~ Replaces 45107-300-003 38.15mm caliper pistonFront piston referencing Honda 45107-300-003, specified as 38.15mm diameter × 34mm length. The application states one per bike; that is a required count. Compare the retained caliper and the piston being replaced.View part Honda CB Caliper Piston Sealing Ring ~ Replaces 45108-300-003 Separate caliper piston sealing ringSeal ring referencing Honda 45108-300-003. Check it against the piston and retained caliper. This listing describes the seal separately from the piston and does not identify a complete caliper service package.View part

Related parts: Separate front bleed screw · Four-component adjusting set · Caliper bolts in a pack of two

Use the assembly contents to prevent duplicate purchases

The complete caliper states both body halves, pads, piston, piston seal/ring, piston cap, bleed screw and cap, bolts and clip. Check which pieces your repair needs before choosing it over individual parts. Its contents list does not establish compatibility with every changed mounting or hydraulic connection.

Distinguish the adjuster set from the body bolt pack

The adjusting set contains bolt, spring, washer and nut, with bolt reference 45117-341-700. The body bolt pack references 90165-300-023 and explicitly supplies two bolts. Compare the fastener location being serviced; these are different repair packages despite sharing the caliper category.

Practical parts selection questions

Does the separate piston listing include its sealing ring?

It identifies a piston with dimensions 38.15mm × 34mm and reference 45107-300-003. The ring has a separate listing referencing 45108-300-003. No ring is itemized with the separate piston, whereas the complete assembly explicitly lists its seal/ring.

Is a rubber cap listed with the standalone bleed screw?

The screw description names reference 45109-300-003 and points to a separately available rubber cap. It does not say that cap is supplied with the screw. The complete caliper assembly has a different contents list that explicitly includes both screw and cap.

How many body bolts does one bolt-pack purchase supply?

The listing expressly states pack of two, referencing 90165-300-023. Compare the removed fasteners and fitted caliper before ordering. Do not confuse those two body bolts with the adjusting set’s bolt, spring, washer and nut.

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