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1980 Honda CB750K Master Cylinder & Reservoir Repair Parts

An internal master-cylinder repair and a damaged plastic reservoir require different purchases for the 1980 CB750K. This range has an internal kit, a four-screw reservoir package and a separate diaphragm. Identify the fitted cylinder and check the old diaphragm plate before choosing the reservoir kit.

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Currently viewing Master Cylinder & Rebuild Parts

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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...
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...
Honda CB750 CB650 CB400T front master cylinder kit 45530-442-315

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-442-315

$49.95 USD
08-0231
Rebuild your early DOHC CB's front master cylinder with this Front Master Cylinder Rebuild Kit, replacing OEM #45530-442-315. Fits the 1979-80 DOHC CB750K/L/C, CB650/CB650C,...
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Honda CB750C CB750K rear brake light switch spring 35357-ME1-670

1979-83 Honda CB750 Rear Brake Light Switch Spring ~ Replaces 35357-ME1-670

$8.19 $7.87 USD
You save $0.32
73-0850
Replace your rear brake stop switch spring with this Rear Brake Light Stop Switch Spring. This is the spring that attaches to the rear...
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,...
Magura universal front master cylinder assembly 16mm

Magura Universal Front Master Cylinder Assembly ~ 16mm

$259.00 USD
08-0251
Step up to dual-disk compatibility with this Magura Universal Front Brake Master Cylinder, featuring a 16mm piston diameter recommended for dual-disk brake systems. Threaded...
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•...
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1980 Honda CB750K · Master Cylinder & Rebuild Parts Buying guide

Choose the master-cylinder repair area first

The internal kit, four-screw reservoir package and separate diaphragm cover different work. Identify the fitted cylinder before selecting a repair package.

Parts to consider

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-442-315 Front master cylinder internal kitInternal repair kit, reference 45530-442-315, listed for the 1979–80 CB750K.View part Honda CB900 / CB750 / CB650 / CB400 Master Cylinder Reservoir Rebuild Kit Four-screw reservoir rebuild kitPlastic reservoir, cap, diaphragm, O-ring and screws for the four-screw cover arrangement.View part Honda CB Front Master Cylinder Reservoir Diaphragm ~ Replaces 45520-422-026 Front reservoir diaphragmSeparate diaphragm, references 45520-422-026, 45520-422-006 and 45520-422-016.View part

Related parts: Chrome four-screw reservoir cover · Master cylinder rubber boot

Retain the diaphragm plate

The reservoir kit calls for the plate from the old cylinder to be reused. A new diaphragm is included, but the plate is a separate retained piece.

Match a replacement cylinder independently

The listed repair references apply to the specified cylinder design. If an aftermarket master cylinder has been fitted, identify that unit before choosing internal or reservoir service parts.

Common questions

Can I replace only the reservoir diaphragm?

Yes. The separate diaphragm replaces references 45520-422-026, 45520-422-006 and 45520-422-016. It is also named in the reservoir kit, so avoid ordering it twice for the same repair.

Which cover arrangement does the chrome lid use?

The chrome cover is a four-screw type, with references 45513-422-671 and 45519-422-671. Compare the fitted reservoir rather than choosing a lid by finish alone.

Does the internal kit replace the plastic reservoir?

The plastic reservoir is supplied in the separate reservoir kit. Choose that package for reservoir replacement rather than assuming it accompanies the internal repair kit.

Not sure which part you need?

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

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