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1971 Honda CB450K Piston Service & Complete Caliper Options

Assess the caliper fitted to your 1971 CB450K before choosing its piston, seal or a complete replacement assembly. The separate parts describe narrower repair scopes, while the assembly lists its contents in detail. Decide what will be retained so that the order avoids overlapping purchases.

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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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1971 Honda CB450K · Brake Calipers, Pistons & Bleed Screws Buying guide

Compare defined piston dimensions with the retained caliper

The piston is specified at 38.15mm diameter and 34mm length. The seal ring carries its own Honda reference. A complete aftermarket assembly is sold each with named piston, pad and bleed components, while adjuster and bolt packages distinguish other caliper hardware.

Parts to consider

1969-76 Honda CB750K / CB450K Front Caliper Piston ~ Replaces 45107-300-003 Caliper piston with defined dimensionsPiston referencing Honda 45107-300-003, 38.15mm diameter and 34mm length. One per bike is stated for this application; confirm the supplied quantity independently. Match the piston to the caliper being retained.View part Honda CB Caliper Piston Sealing Ring ~ Replaces 45108-300-003 Piston seal as a separate repair partCaliper piston sealing ring referencing Honda 45108-300-003. Compare the retained caliper and seal arrangement. The description identifies the ring itself, without listing a replacement piston or complete caliper package.View part 1969-76 Honda CB750K / CB450K Front Brake Caliper Assembly ~ Replaces Honda OEM 45100-341-003 Aftermarket caliper with named contentsAssembly sold each, referencing Honda 45100-341-003. Includes both body halves, pads, piston, seal/ring, piston cap, bleed screw and cap, bolts and clip. Compare the fitted brake and avoid duplicating these listed parts in the order.View part

Related parts: Adjuster package with four parts · Two-piece body bolt pack · Individually described bleed screw

Choose an assembly from its stated contents

The replacement assembly includes both body halves, pads, piston, seal/ring, piston cap, bleed screw and cap, bolts and clip. It is explicitly aftermarket and sold each. Compare the existing mounting and brake arrangement before selecting it; a complete parts list does not establish compatibility with every modified system.

Identify the fastener location before choosing a set

The body bolts are a pack of two referencing 90165-300-023. The adjusting set instead names an adjusting bolt, spring, washer and nut, with bolt reference 45117-341-700. Compare the hardware being removed and keep those packages separate when planning a broader caliper repair.

Questions to help choose the repair parts

Is the piston’s one-per-bike statement the same as its package contents?

It gives the application count. The piston description supplies dimensions and reference 45107-300-003, without naming a seal as included. Confirm the quantity supplied by the purchase and assess the separate sealing-ring listing when planning the repair.

What hardware is supplied in the caliper adjusting set?

The adjusting set lists its bolt, spring, washer and nut, with bolt reference 45117-341-700. The separate caliper body bolt pack supplies two 90165-300-023 bolts. Match the fastener location before choosing either package for the repair.

Which purchase explicitly lists the bleed screw cap as supplied?

The complete caliper assembly includes both bleed screw and cap in its contents. The standalone screw description references 45109-300-003 and points to a separately available rubber cap. Read the chosen package before assuming the screw alone includes that cap.

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