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1980 Honda CB650 Master-Cylinder Repairs

Determine whether your 1980 CB650 needs a reservoir, its cover or an entire master-cylinder assembly replaced. Those choices use different products. The four-screw reservoir kit depends on the old diaphragm plate, so check retained pieces before buying.

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Currently viewing Master Cylinder & Rebuild Parts

Honda motorcycle parts

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Honda CB750 CB550 CB400F front master cylinder assembly 5 8 in.

Honda CB Front Master Cylinder Assembly ~ 5/8 in.

$99.95 USD
08-0253
Drop in a factory-look master cylinder with a performance piston size using this Front Brake Master Cylinder Assembly. Black body with silver lever, custom-manufactured...
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Honda CB900 CB750 CB650 front master cylinder assembly

Honda CB900 / CB750 / CB650 Front Master Cylinder Assembly

$109.95 USD
08-0457
Fit a blacked-out front master cylinder to your late-'70s or early-'80s DOHC CB with this Front Brake Master Cylinder Assembly. Usable on any single...
Honda CB900 CB750 CB650 CB400 master cylinder reservoir rebuild kit

Honda CB900 / CB750 / CB650 / CB400 Master Cylinder Reservoir Rebuild Kit

$74.95 USD
29-0050
Rebuild your master cylinder reservoir with this Front Master Cylinder Reservoir Rebuild Kit, 4-screw cover type. Includes plastic reservoir, reservoir cap, diaphragm, O-ring, and...
New
Honda CB750 CB550 CB400F front master cylinder assembly 14mm

Honda CB Front Master Cylinder Assembly ~ 14mm

$99.95 USD
08-0269
Restore strong and consistent braking performance with this Front Brake Master Cylinder Assembly, designed as a high-quality replacement for many classic Honda models. This...
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...
Honda CB750 CB900 CB650 master cylinder diaphragm 45520-422-026

Honda CB Front Master Cylinder Reservoir Diaphragm ~ Replaces 45520-422-026

$11.50 USD
08-0285
Replace the diaphragm on your early DOHC CB's front master cylinder reservoir with this Front Master Cylinder Reservoir Diaphragm, replacing OEM #45520-422-026 / #45520-422-006...
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 CB650 CB750 CB900 replacement brake lever for master cylinder 08-0457

Replacement Brake Lever for Master Cylinder 08-0457

$9.95 USD
08-0018
Replace the brake lever specifically on the #08-0457 Master Cylinder (sold separately) with this Brake Lever.Important: this lever is ONLY for Master Cylinder #08-0457,...
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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...
New
Honda CB750 CB650 rear brake light switch 35350-MG7-405

1979-82 Honda CB750 / CB650 Rear Brake Light Switch ~ Replaces 35350-MG7-405

$15.82 USD
27-5523
Restore reliable brake light activation with this Rear Stop Light Switch, designed as a direct replacement for several original Honda rear brake switches. This...
Honda CB900 CB750 CB650 CB400 chrome master cylinder cover 45513-422-671

Honda CB900 / CB750 / CB650 / CB400 Chrome Master Cylinder Cover ~ Replaces 45513-422-671

$16.95 USD
29-0070
Add chrome to your master cylinder with this Chrome Master Cylinder Cover, 4-screw type, replacing OEM #45513-422-671 / #45519-422-671.Key Features• Chrome master cylinder cover•...
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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1980 Honda CB650 · Master-Cylinder Repairs Buying guide

Choose a repair scope before choosing a master-cylinder kit

The reservoir kit and separate chrome cap offer different repair scopes. Complete aftermarket assemblies introduce their own bore, switch and lever requirements, making the installed cylinder’s identity the first ordering check.

Parts to consider

Honda CB900 / CB750 / CB650 / CB400 Master Cylinder Reservoir Rebuild Kit Four-screw reservoir kitFour-screw package containing reservoir, cap, diaphragm, O-ring and screws.View part Honda CB900 / CB750 / CB650 / CB400 Chrome Master Cylinder Cover ~ Replaces 45513-422-671 Four-screw chrome coverChrome reservoir cover; references 45513-422-671 and 45519-422-671.View part Honda CB900 / CB750 / CB650 Front Master Cylinder Assembly Black replacement master cylinderAftermarket assembly with black body, black lever and a 15.8mm piston.View part

Related parts: Reservoir diaphragm

Confirm what comes with the chrome cover

The chrome-cover listing identifies the cover but does not itemize screws or a diaphragm. Confirm the supplied contents if your repair also needs those pieces, rather than assuming the cover package matches the larger reservoir kit.

Check the replacement switch and hydraulic interfaces

The black assembly has an integrated brake-light switch with two small spade connectors. Compare those connections with the motorcycle wiring, and have its hydraulic suitability, hose connection and lever clearance checked before substitution.

Ordering questions

What happens if the old reservoir diaphragm plate is missing?

The four-screw reservoir kit instructs you to reuse the diaphragm plate from the old master cylinder. Resolve a missing or unusable plate before relying on this package to complete the reservoir repair.

Can I buy a diaphragm without the larger reservoir package?

The separate diaphragm replaces 45520-422-026, 45520-422-006 or 45520-422-016. Compare it with the fitted reservoir and inspect the retained parts before choosing that narrower repair.

Will the chrome cover fit an aftermarket reservoir?

That is not established by the motorcycle application. Compare the actual cover mounting and sealing interface with the replacement reservoir; a four-screw description alone does not prove interchangeability.

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Send your model and year, plus photos of your existing part and any changes to the original setup.

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