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1986 Honda CB450SC Nighthawk Caliper Piston Sizes and Repair Kit Coverage

A front-caliper rebuild on a 1986 Honda CB450SC Nighthawk needs the removed piston identified before the parts order. Two listings name the motorcycle’s front application with different piston diameters. Match the actual piston and caliper, inspect the retained hard parts and confirm kit contents instead of choosing from a broad front-or-rear title.

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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 CB1100 CB1000 CB900 CB750 caliper bleed screw 43352-568-003

Honda CB Caliper Bleed Screw ~ Replaces 43352-568-003

$7.95 USD
73-0994
Replace your caliper bleed screw with this Brake Caliper Bleed Screw, replacing OEM #43352-568-003.Key Features• Brake caliper bleed screw• Replaces OEM #43352-568-003• Honda part...
Honda CB1100 CB1000 CB900 CB750 CB650 caliper piston 45107-MA3-006

Honda CB Caliper Piston ~ Replaces 45107-MA3-006

$26.95 USD
29-0509
Replace your DOHC CB caliper piston with this Brake Caliper Piston, 30.15mm diameter x 35mm length, replacing OEM #45107-MA3-006.Key Features• Brake caliper piston• 30.15mm...
Honda CB1000C CB900C CB750K CB450SC CB400T deluxe caliper repair kit

1981-86 Honda CB1000C / CB900C / CB750K / CB450SC / CB400T Deluxe Caliper Repair Kit

$29.95 USD
29-6001
Freshen up the brake caliper on compatible Honda CB models with this aftermarket deluxe brake caliper repair kit. This kit is intended for rebuilding...
Honda CB1000C CB900C CB650 CB450SC CB400T caliper rebuild kit

1981-86 Honda CB1000C / CB900C / CB650 / CB450SC / CB400T Caliper Rebuild Kit

$37.95 USD
29-0013
Rebuild a single brake caliper with this Single Brake Caliper Rebuild Kit (repairs one caliper).Key Features• Single brake caliper rebuild kit• Repairs one caliperFitment...
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Honda CB1100 CB900 CB750 CB650 caliper piston w seals 43107-MA3-006

Honda CB Caliper Piston w Seals ~ Replaces 43107-MA3-006

$37.95 USD
29-0530
Replace your DOHC caliper piston with this Brake Caliper Piston with Seals, 27mm diameter x 35mm length, replacing OEM #43107-MA3-006.Key Features• Brake caliper piston...
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1986 Honda CB450SC Nighthawk · Front Caliper Service Buying guide

Match diameter and Honda reference before choosing a piston package

One piston option measures 30.15 × 35 mm and names 45107-MA3-006. The other measures 27 × 35 mm, includes its seals and names 43107-MA3-006. Each listing states two for its CB450SC front application. Regular and deluxe repair kits both cover one compatible caliper; the 43352-568-003 bleeder also explicitly lists this front application.

Parts to consider

Honda CB Caliper Piston ~ Replaces 45107-MA3-006 30.15 × 35 mm piston without a stated seal bundleOne 45107-MA3-006 replacement piston; match actual diameter, reference and front-caliper application.View part Honda CB Caliper Piston w Seals ~ Replaces 43107-MA3-006 27 × 35 mm piston with its sealsOne 43107-MA3-006 replacement piston and seals; a different diameter requires its own exact match.View part 1981-86 Honda CB1000C / CB900C / CB650 / CB450SC / CB400T Caliper Rebuild Kit Regular one-caliper repair packageListed for the 1986 CB450SC front caliper; full individual contents require confirmation.View part

Related parts: Deluxe one-caliper kit with contents to confirm · 43352-568-003 front-caliper bleed screw

Do not turn two different piston listings into an interchange claim

The shared front-model entry does not explain how the two piston diameters relate to the caliper fitted. Compare the removed part, dimensions and Honda reference before selecting either. Do not assume that both are mandatory purchases or use one listing’s two-piece requirement to calculate a combined total for both products.

Confirm the written repair scope before choosing regular or deluxe

Both kits establish one-caliper coverage, but neither gives a complete included-parts inventory. Confirm any seal, boot or small part central to the repair before choosing. Inspect piston and bore corrosion, scoring or plating damage; a seal package cannot correct damaged hard parts, so that finding may change the repair.

Parts ordering FAQs

How do I choose between the 30.15 mm and 27 mm piston listings?

Match the removed piston’s diameter, 35 mm length, Honda reference and caliper identity. The listings name 45107-MA3-006 at 30.15 mm and 43107-MA3-006 at 27 mm for the front application. They do not establish interchange or that both types belong in one order.

What should decide a regular-kit versus deluxe-kit purchase?

Ask for confirmation of the particular seals, boots or small parts your repair requires. Both listings cover one compatible caliper, but neither publishes an exhaustive contents list. Compare confirmed contents with the inspection findings; the deluxe name alone does not identify every included piece.

Which details identify the replacement bleeder if the fitted caliper is uncertain?

Use 43352-568-003 and compare thread diameter, pitch, overall length and conical sealing-seat shape with the retained caliper. This listing names the 1986 CB450SC front position. Similar appearance cannot establish the match; inspect the seat and follow Honda fluid and tightening specifications.

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