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1986 Honda CB450SC Nighthawk Master Cylinder References and Connection Planning

Before ordering front-master parts for a 1986 Honda CB450SC Nighthawk, decide whether the fitted assembly will be repaired or replaced. The internal kit and reservoir diaphragm have specific Honda references. A universal 13 mm assembly adds hydraulic suitability, connection hardware and mirror decisions that the model name cannot settle.

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Honda motorcycle parts

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Honda CB1100 CB1000 CB900 master cylinder rubber boot 45522-422-000

Honda CB Master Cylinder Rubber Boot ~ Replaces 45522-422-000

$8.95 USD
73-0094
Replace your master cylinder rubber boot with this Master Cylinder Rubber Boot, replacing OEM #45522-422-000.Key Features• Master cylinder rubber boot• Replaces OEM #45522-422-000• Honda...
Universal Honda-type front master cylinder assembly 13mm

Universal Honda-Type Front Master Cylinder Assembly ~ 13mm

$84.95 USD
08-0262
Upgrade to a universal front master cylinder assembly with this Honda-type unit. Complete with lever, banjo bolt, banjo bolt washers, and brake light switch,...
Honda CB750 CB700SC CB650 master cylinder diaphragm 45520-MA5-671

Honda CB Front Master Cylinder Reservoir Diaphragm ~ Replaces 45520-MA5-671

$11.50 USD
08-0284
Replace the diaphragm on your later DOHC CB's front master cylinder reservoir with this Front Master Cylinder Reservoir Diaphragm, replacing OEM #45520-MA5-671 / #45520-MA5-672...
Honda CB750K CB1000 CB650 front master cylinder kit 45530-MA4-671

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-MA4-671

$29.95 USD
08-0201
Rebuild your later-model CB's front master cylinder with this Front Master Cylinder Rebuild Kit, replacing OEM #45530-MA4-671. Fits the CB750K (1981-82), CB1000, CB900F (2002-07),...
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Honda CB750 CB650 CB550 replacement brake lever for master cylinder

Honda CB Replacement Brake Lever for Master Cylinder 08-0262

$9.95 USD
08-0430
Replace the brake lever on the #08-0262 Master Cylinder Assembly specifically with this Brake Lever. Designed for this particular master cylinder.Key Features• Replacement brake...
Magura universal front master cylinder assembly 13mm

Magura Universal Front Master Cylinder Assembly ~ 13mm

$259.00 USD
08-0250
Build a custom front brake setup with this Magura Universal Front Brake Master Cylinder. Features a 13mm piston diameter, 12mm stroke, and a threaded...
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1986 Honda CB450SC Nighthawk · Front Master Repair Buying guide

Choose the assembly path before combining service pieces

The internal service kit names 45530-MA4-671. Reservoir diaphragm references 45520-MA5-671 and 45520-MA5-672 provide the consistent identification points. Universal Honda-type and Magura assemblies both use a 13 mm bore, but have different supplied connections; Magura also specifies 12 mm stroke and no mirror mount.

Parts to consider

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-MA4-671 45530-MA4-671 front-master repair kitCurrent model application is explicit; confirm any particular internal component because full contents are not itemized.View part Honda CB Front Master Cylinder Reservoir Diaphragm ~ Replaces 45520-MA5-671 Reference-matched reservoir diaphragmUse 45520-MA5-671 / 45520-MA5-672 and the exact reservoir application.View part Universal Honda-Type Front Master Cylinder Assembly ~ 13mm Honda-type universal 13 mm front assemblySingle-disc design includes lever, banjo bolt, washers and brake-light switch, plus a right-hand-threaded mirror mount.View part

Related parts: 45522-422-000 actuating-end protective boot · Magura 13 mm assembly with separate connections · Dedicated lever for the Honda-type replacement assembly

Use the retained master’s identity when buying repair pieces

The internal kit’s Honda reference identifies its application but does not list every supplied component. Confirm the piece needed for the repair. Reservoir diaphragms with similar descriptions require their own reference comparison, and the external boot’s application does not establish the condition of the bore, piston or hydraulic seals.

Plan custom hydraulics and fittings before comparing bundles

Magura’s 13 mm bore and 12 mm stroke are intended for a hydraulically suitable single-disc system. Its switch, M10 × 1.0 banjo bolt, sealing washer and mirror support are separate purchases. The Honda-type assembly includes its stated fittings. Neither listing establishes the original CB450SC bore or an unchecked stock installation.

Parts ordering FAQs

What should I establish before choosing either universal 13 mm assembly?

Confirm the fitted brake system’s hydraulic requirements rather than deciding from handlebar fit. Both listings describe single-disc use; Magura specifies 13 mm bore and 12 mm stroke. These product specifications do not establish the original master’s bore or compatibility with an altered caliper.

Which reservoir information will distinguish the diaphragm from similarly named parts?

Record 45520-MA5-671 or 45520-MA5-672 and confirm the exact reservoir and model application. The listing warns that several Honda diaphragms have similar descriptions. Use that reference match when asking for the replacement, especially if a different master has been fitted.

What assembly identification is needed for the separately offered replacement lever?

The dedicated lever is made specifically for Honda-type master assembly 08-0262. Confirm that assembly is actually fitted before ordering it. Original-application lever references and the motorcycle’s year do not establish this replacement lever’s fit to another original or aftermarket master.

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