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1975 Honda CB550K Front Master Cylinder & Rebuild Parts

The bar-mounted brake pump on a 1975 Honda CB550K can be resealed with a Japanese kit or swapped for a complete unit with a 14mm or 5/8 inch piston. Reservoir caps, diaphragm, lever boot and the small damper set are listed alongside.

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Currently viewing Master Cylinder & Rebuild Parts

Honda motorcycle parts

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Honda CB750 CB550 CB400F front master cylinder kit 45530-377-305

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-377-305

$37.95 USD
08-0215
Rebuild your early SOHC CB's front master cylinder with this Front Brake Master Cylinder Rebuild Kit, replacing OEM #45530-377-305. Made in Japan. Fits the...
Honda CB750 CB550 CB500 master cylinder rubber boot 45522-300-010

Honda CB Master Cylinder Rubber Boot ~ Replaces 45522-300-010

$9.95 USD
33-0003
Replace your master cylinder rubber boot with this Master Cylinder Rubber Boot, which attaches where the brake hose joins the master cylinder. Replaces OEM...
New
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 CB750 CB550 CB400F master cylinder diaphragm 45520-300-000

Honda CB Master Cylinder Reservoir Diaphragm ~ Replaces 45520-300-000

$10.95 USD
08-0282
Replace a hardened or torn master cylinder diaphragm with this Master Cylinder Reservoir Diaphragm, replacing OEM #45520-300-000. Exceptional range of applications, fits FRONT master...
Honda CB750 CB550 CB500 CB400 CB350 master cylinder damper set

Honda CB Master Cylinder Damper Set

$6.95 USD
73-0841
Replace your master cylinder damper with this Master Cylinder Damper Set. Includes brake master cylinder rubber damper, plate, and washer. This set is often...
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 CB1000 CB900 master cylinder reservoir cap plastic o-ring 45521-MJ6-006

Honda CB Master Cylinder Reservoir Cap Plastic O-Ring ~ Replaces 45521-MJ6-006

$4.95 USD
29-0062
Replace your master cylinder cap O-ring with this Master Cylinder Reservoir Cap Plastic O-Ring, replacing OEM #45521-MJ6-006.Key Features• Master cylinder reservoir cap O-ring• Plastic•...
Honda CB1100 CB1000 CB900 master cylinder reservoir cap 45513-341-771

Honda CB Master Cylinder Reservoir Cap ~ Replaces 45513-341-771

$39.95 USD
29-0054
Restore your master cylinder cap with this Master Cylinder Cap with Plastic O-Ring, replacing OEM #45513-341-771. This original style was discontinued long ago by...
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,...
Sold out
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...
Honda CB1100 CB1000 CB900 master cylinder reservoir cap 43513-MJ6-006

Honda CB Master Cylinder Reservoir Cap ~ Replaces 43513-MJ6-006

$23.45 USD
29-0080
Replace your master cylinder reservoir cap with this Master Cylinder Reservoir Cap with Diaphragm, round OEM thread-on type. Cap replaces OEM #43513-MJ6-006, diaphragm replaces...
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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1975 Honda CB550K · Master Cylinder Buying guide

Rebuild kit or new assembly

Identify the fitted master cylinder before choosing a rebuild kit or replacement. Compare bore, body, lever and reservoir parts with the listings and have its condition assessed. Confirm rebuild parts separately for an aftermarket assembly.

Parts to consider

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-377-305 Japanese master cylinder rebuild kitJapanese-made rebuild kit referencing Honda 45530-377-305; its compatibility list names the 1974-76 CB550K.View part Honda CB Front Master Cylinder Assembly ~ 14mm 14mm master cylinder assemblyBlack body, silver lever and the 14mm piston size quoted as stock for most listed bikes.View part Honda CB Master Cylinder Damper Set Lever damper setRubber damper, plate and washer that cut lever vibration; often missing on older bikes.View part

Related parts: 5/8 inch master cylinder assembly · Reproduction reservoir cap · Reservoir diaphragm

Choosing the bore size

The two complete assemblies specify different piston sizes: 14mm and 5/8 inch. Both listings name the CB550K, and the 14mm description asks customers to confirm the fitted size. Compare the installed bore and controls, and verify the intended setup before choosing either assembly.

Universal units without CB550 fitment

Universal master-cylinder listings need a separate comparison of bore, mounting, lever and brake-light arrangements. Their presence in this section does not confirm stock CB550K fitment. Use the assembly manufacturer's instructions and the fitted brake system to establish suitability before choosing a custom replacement.

Master cylinder FAQs

Will the seal kit suit a 1975 CB550K?

The Japanese kit listing references Honda 45530-377-305 and names the 1974-76 CB550K. Identify the fitted master cylinder first; for a replacement or custom assembly, confirm its required rebuild parts separately rather than assuming the original-model kit will suit it.

What does the damper set do?

It holds a rubber damper, plate and washer that reduce vibration reaching the brake lever. The listing notes the set is often missing and lists the CB550K from 1974 to 1976.

Is the reservoir cap original style?

Yes, it reproduces a cap design Honda dropped long ago, numbered 45513-341-771, and is supplied together with its plastic O-ring. Compatibility covers CB550K bikes built from 1974 to 1978.

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