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1977 Honda CB750A Master Cylinder & Reservoir Parts

The 1977 Honda CB750A master-cylinder range includes reservoir service pieces and replacement assemblies with different specifications. Decide whether the repair retains the existing cylinder or changes the assembly. A cap or diaphragm purchase and a replacement cylinder have different contents and control requirements.

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Currently viewing Master Cylinder & Rebuild Parts

Honda motorcycle parts

Choose your model and year to see parts listed for your bike.

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...
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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 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 CB400 front master cylinder kit 45530-404-315

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-404-315

$59.95 USD
08-0281
Service your late-'70s CB750K/A, CB550, or CB400 front master cylinder with this Front Brake Master Cylinder Rebuild Kit, replacing OEM #45530-404-315. Made in Japan.Key...
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,...
Honda CB750A CB750K rear brake light switch spring 35357-393-000

1976-78 Honda CB750A / CB750K Rear Brake Light Switch Spring ~ Replaces 35357-393-000

$5.80 USD
73-1006
Replace your rear brake stop switch spring with this Rear Brake Light Stop Switch Spring. This is the spring that attaches to the rear...
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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...
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...
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Honda CB750 replacement brake lever for master cylinder 08-0253

Replacement Brake Lever for Master Cylinder 08-0253

$9.95 USD
08-0029
Replace the brake lever on the #08-0253 Master Cylinder Assembly specifically with this Brake Lever. Designed for this particular master cylinder, not stock 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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1977 Honda CB750A · Master Cylinder & Reservoir Buying guide

Check the 1977 Hondamatic brake-light requirement before replacing the cylinder

Reservoir caps and diaphragms are service parts for a retained cylinder. The featured 14 mm replacement is a different decision: its 1977–78 CB750A application requires a separate hydraulic brake-light switch.

Parts to consider

Honda CB Master Cylinder Reservoir Diaphragm ~ Replaces 45520-300-000 Front reservoir diaphragmReference 45520-300-000, specifically listed for the CB750A front master cylinder. Other models use this part in different positions.View part Honda CB Master Cylinder Reservoir Cap ~ Replaces 45513-341-771 Reservoir cap with plastic O-ringCap replacing reference 45513-341-771. The description explicitly states a plastic O-ring is included with this cap.View part Honda CB Front Master Cylinder Assembly ~ 14mm 14mm replacement cylinder assemblyBlack body with silver lever. For the 1977–78 CB750A, the listing requires a separate hydraulic brake-light switch because the assembly lacks the OEM-type switch.View part

Related parts: Separate cap plastic O-ring · Rubber boot at the hose connection

Assess the retained reservoir parts before choosing a package

Check the cap, diaphragm and surrounding reservoir separately, then match the references to the installed cylinder. Decide which parts can be retained before adding a cap and loose sealing pieces to the same order.

Identify the switch arrangement as part of a cylinder change

Record the fitted cylinder and brake-light switch before choosing the replacement assembly. Its 1977–78 CB750A condition calls for hydraulic switch 29-7002; also confirm the piston size as the listing requests. Have the full brake-control arrangement verified before installation.

Common questions

Does the selected reservoir cap include its plastic O-ring?

Yes. The cap description explicitly names a plastic O-ring with the cap. The ring is also available separately, so compare the retained cap and contents before duplicating that component in a reservoir-service order.

Is the 14mm cylinder an unconditional replacement for the CB750A control?

Its listing requires a separate hydraulic brake-light switch for the 1977–78 CB750A because the assembly lacks the OEM-type switch. Read that condition and confirm piston size before choosing it for the fitted brake system.

Where does the separately listed rubber boot belong?

The boot description identifies the junction where the brake hose joins the master cylinder, reference 45522-300-010. It is a different component from the reservoir diaphragm and cap O-ring, so compare the part at that connection before ordering.

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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