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1979 Honda CB400TII Hawk II Master-Cylinder Repair Parts

The 1979 Hawk II master cylinder needs its own parts identification. Check the fitted reservoir and cylinder before choosing the rebuild kit, diaphragm or rubber boot, especially if past repairs have introduced an earlier control or a universal replacement assembly.

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Currently viewing Master Cylinder & Rebuild Parts

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...
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,...
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,...
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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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1979 Honda CB400TII Hawk II · Master-Cylinder Repair Parts Buying guide

Identify the 1979 reservoir and cylinder together

Honda’s 1979 addendum shows the rectangular reservoir assembly and specifies a nominal 14 mm cylinder. Use the exact application and component references when assembling an original-unit repair order.

Parts to consider

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-442-315 1979 master-cylinder rebuild kitStock-unit rebuild kit explicitly listed for the 1979 CB400TII; reference 45530-442-315.View part Honda CB Front Master Cylinder Reservoir Diaphragm ~ Replaces 45520-422-026 1979 reservoir diaphragmDiaphragm for the 1979 CB400TII reservoir; references 45520-422-026, -006 and -016.View part Honda CB Master Cylinder Rubber Boot ~ Replaces 45522-422-000 Master-cylinder rubber bootSeparate rubber boot replacing reference 45522-422-000, with a 1979 CB400TII application.View part

Match internals to the installed unit

The rebuild kit explicitly covers the 1979 CB400TII and references 45530-442-315. Have the bore inspected before committing to a rebuild: damaged cylinder surfaces need assessment, not just new internal components. Honda’s 1979 addendum supplies the applicable inspection and assembly instructions.

Order reservoir and boot parts by location

The reservoir diaphragm and external rubber boot are separate selections. The diaphragm references 45520-422-026, -006 and -016; the boot references 45522-422-000. Compare their shapes with the original unit and check current kit contents before duplicating parts already included in a rebuild package.

Ordering questions

Can I use a 1978 master-cylinder kit for this motorcycle?

Do not choose it solely because the motorcycle is a Hawk II. The featured kit explicitly supports the 1979 CB400TII under reference 45530-442-315; identify the installed master cylinder first.

Are the universal 13 mm assemblies equivalent to the stock cylinder?

Honda’s 1979 specification identifies a nominal 14 mm original cylinder. A universal 13 mm unit requires a separate brake-system compatibility assessment, including its fittings, lever, switch and mounting arrangement.

Do I need the separate diaphragm and rubber boot?

Inspect those parts individually and compare the rebuild kit’s current contents before ordering duplicates. Their separate product references make it possible to replace the damaged reservoir or outer boot component specifically.

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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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