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1981 Honda CB400TB Master-Cylinder Parts

Internal hydraulic service and reservoir repairs are different jobs on the 1981 Hawk master cylinder. This selection separates the piston-service kit, two-screw reservoir kit and replacement diaphragm. Identify the fitted cylinder and damaged area before choosing a complete repair or a smaller replacement.

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Currently viewing Master Cylinder & Rebuild 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...
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...
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...
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),...
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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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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1981 Honda CB400TB · Master-Cylinder Service Buying guide

Separate internal service from reservoir replacement

The original-type 1981 assembly has model-specific internal parts and a two-screw reservoir cover. Compare those features with the bike before ordering, because replacement master cylinders may need a different kit, cap or lever.

Parts to consider

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-MA4-671 Master-cylinder rebuild kitInternal repair kit replacing reference 45530-MA4-671 for the 1981 front master cylinder.View part Honda CB Master Cylinder Reservoir Rebuild Kit Two-screw reservoir kitIncludes the plastic reservoir, cap, diaphragm, O-ring and screw hardware for the two-screw cover type.View part Honda CB Front Master Cylinder Reservoir Diaphragm ~ Replaces 45520-MA5-671 Reservoir diaphragmSeparate replacement for the 45520-MA5-671 / 45520-MA5-672 diaphragm reference family.View part

Locate the repair within the assembly

The internal rebuild kit references 45530-MA4-671. Reservoir components sit above that hydraulic section and are ordered for a different repair. Determine whether the fault involves the bore and piston, the reservoir attachment or the cover diaphragm before buying overlapping parts.

Recheck the order after a master-cylinder swap

A universal or custom master cylinder may have a different bore, switch, reservoir and lever. Choose parts for that installed assembly. Matching handlebar mounting alone does not establish hydraulic compatibility, and a larger bore should not be treated as an automatic braking improvement.

Buying questions

Should I choose the reservoir kit or the separate diaphragm?

Use the separate diaphragm when that is the required replacement and the surrounding reservoir parts are sound. Choose the reservoir kit when its plastic reservoir, cap, diaphragm, O-ring and hardware match the broader repair.

Does the internal kit replace a damaged cylinder body?

No. Have the bore and body inspected before deciding to rebuild. An internal kit renews its supplied service components; it does not remove scoring, corrosion or other damage in the master-cylinder body.

Will these parts fit an aftermarket master cylinder?

Only when its manufacturer and part specification establish compatibility. Identify the installed assembly and its service kit first; a CB400TB application for the original cylinder does not automatically cover a universal replacement.

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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