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1981 Honda CB750K Master Cylinder & Reservoir Repair Parts

The front master cylinder and its reservoir need different repair choices. For the 1981 Honda CB750K, the options include the later-model master rebuild kit, a two-screw reservoir kit, separate diaphragm and cover parts, plus universal assemblies that require their own configuration checks.

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Currently viewing Master Cylinder & Rebuild Parts

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Honda CB900 CB750 CB650 CB450 master cylinder reservoir rebuild kit

Honda CB Master Cylinder Reservoir Rebuild Kit

$54.95 USD
29-0051
Rebuild your master cylinder reservoir with this Front Master Cylinder Reservoir Rebuild Kit, 2-screw cover type. Includes plastic reservoir, reservoir cap, diaphragm, O-ring, and...
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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 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 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...
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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,...
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),...
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 CB1100 CB900 CB750 chrome master cylinder cover 45513-MA5-671

Honda CB Chrome Master Cylinder Cover ~ Replaces 45513-MA5-671

$22.95 USD
29-0071
Add chrome to your master cylinder with this Chrome Master Cylinder Cover, 2-screw type, replacing OEM #45513-MA5-671 / #45513-413-941.Key Features• Chrome master cylinder cover•...
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1981 Honda CB750K · Master Cylinder & Rebuild Parts Buying guide

Match the 1981–82 repair parts to the installed master cylinder

The master-cylinder kit 08-0201, reservoir kit 29-0051 and diaphragm 08-0284 each list the 1981–82 CB750K. They cover different parts of the assembly. Use those specific applications and replacement references when choosing parts for a 1981 CB750K.

Parts to consider

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-MA4-671 Front master cylinder rebuild kitThe listing identifies the 1981–82 CB750K application and Honda replacement reference 45530-MA4-671. Its description does not itemize the individual kit components.View part Honda CB Master Cylinder Reservoir Rebuild Kit Two-screw reservoir rebuild kitLists a plastic reservoir, cap, diaphragm, O-ring and screw for the two-screw cover type. Check the cover arrangement and hardware details before ordering.View part Honda CB Front Master Cylinder Reservoir Diaphragm ~ Replaces 45520-MA5-671 Separate reservoir diaphragmDiaphragm 08-0284 replaces references 45520-MA5-671, 45520-MA5-672 and 45520-H5M-630. It lists the 1981–82 CB750K; a diaphragm is also included in reservoir kit 29-0051.View part

Related parts: Two-screw chrome reservoir cover · Separate master cylinder rubber boot · Universal Magura master cylinder assembly

Separate the hydraulic repair from the reservoir package

Master kit 08-0201 replaces reference 45530-MA4-671, but its description does not itemize the contents. Reservoir kit 29-0051 does: plastic reservoir, cap, diaphragm, O-ring and screw. Match the repair to the correct package and confirm any unspecified internal parts before ordering extras.

Plan the controls around a replacement assembly

The universal Magura assembly has a 16mm piston recommended in its listing for dual-disc systems. Its brake-light switch, banjo bolt and washers are separate, and it has no mirror mount. A complete assembly therefore needs a control and mounting check as well as a hydraulic compatibility check.

Common questions

Will the chrome cover also replace the reservoir diaphragm?

The chrome cover is listed as a two-screw cover replacing 45513-MA5-671 or 45513-413-941. It does not list a diaphragm as included. Choose diaphragm 08-0284 separately if needed, or check the reservoir kit, which already lists both a cap and diaphragm.

Can I order every internal seal from the master-kit description?

The 08-0201 description gives its application and replacement reference but no itemized contents. Ask us to confirm the specific part you need before relying on that kit to supply it. The separately listed rubber boot 73-0094 replaces 45522-422-000; its separate listing does not establish whether it is also in the kit.

What happens to the mirror when fitting the Magura assembly?

The Magura assembly has no mirror mount. Its listing recommends a separate mount if required. Check the mirror attachment along with the separate brake-light switch and hose hardware before choosing this universal assembly.

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