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1981 Honda CB900C Custom Caliper Kits & Pistons

Identify the calipers fitted to your 1981 CB900C Custom before choosing rebuild parts. This year’s dual front kit has a specific application. The 42.8 × 41mm piston is listed for both front and rear positions, but the required motorcycle quantities and seal kits remain distinct.

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Most orders ship same or next business day Fitment guarantee Listed for your exact model and year? We’ll make it right if it doesn’t fit as described. Mechanic-backed support Ask our team for help choosing the right Honda CB part.
Currently viewing Brake Caliper Rebuild Kits, Caliper Pistons, Bleed Screws

Honda motorcycle parts

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

Honda CB900 CB750 CB650 front caliper piston sealing ring 45215-533-004

Honda CB900 / CB750 / CB650 Front Caliper Piston Sealing Ring ~ Replaces 45215-533-004

$5.80 USD
29-0529
Replace your front caliper piston sealing ring with this Front Brake Caliper Piston Sealing Ring, replacing OEM #45215-533-004.Key Features• Front brake caliper piston sealing...
Honda CB1100 CB1000 CB900 CB750 caliper bleed screw 43352-568-003

Honda CB Caliper Bleed Screw ~ Replaces 43352-568-003

$7.95 USD
73-0994
Replace your caliper bleed screw with this Brake Caliper Bleed Screw, replacing OEM #43352-568-003.Key Features• Brake caliper bleed screw• Replaces OEM #43352-568-003• Honda part...
Honda CB1100 CB1000 caliper bleed cap (pk 10) 45108-425-003

Honda CB Caliper Bleed Screw Rubber Cap (Pk/10) ~ Replaces 45108-425-003

$11.95 USD
29-0500
Stock up on caliper bleed screw rubber caps with this Brake Caliper Bleed Screw Rubber Cap 10-pack. Universal type for series 1, 3, 4,...
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Honda CB900C rear caliper rebuild kit

1980-81 Honda CB900C Rear Caliper Rebuild Kit

$47.62 $38.95 USD
You save $8.67
29-0012
Rebuild your CB900C Custom rear caliper with this Rear Brake Caliper Rebuild Kit. OEM quality, made in Japan.Key Features• Rear brake caliper rebuild kit•...
Honda CB900C caliper piston 45107-415-006

1980-81 Honda CB900C Caliper Piston ~ Replaces 45107-415-006

$44.95 USD
29-0514
Replace your CB900C Custom caliper piston with this Brake Caliper Piston, 42.8mm diameter x 41mm length, replacing OEM #45107-415-006.Key Features• Brake caliper piston• 42.8mm...
Honda CB900C front caliper rebuild kit

1981 Honda CB900C Front Caliper Rebuild Kit

$49.95 USD
29-0003
Rebuild both your CB900C Custom front calipers with this Front Caliper Dual Rebuild Kit (repairs two front calipers).Key Features• Front caliper dual rebuild kit•...
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1981 Honda CB900C Custom · Caliper Kits & Pistons Buying guide

Inspect the caliper before choosing seals or pistons

Match the 1981 Custom caliper by year and brake position, then inspect its piston surfaces, seal grooves and sliding hardware. A seal kit cannot restore badly damaged metal parts.

Parts to consider

1981 Honda CB900C Front Caliper Rebuild Kit 1981 dual front-caliper kitRepairs two front calipers; specifically listed for the 1981 CB900C Custom.View part 1980-81 Honda CB900C Caliper Piston ~ Replaces 45107-415-006 1981 caliper piston42.8mm diameter × 41mm length; two specified at the front and one at the rear on the 1981 Custom.View part 1980-81 Honda CB900C Rear Caliper Rebuild Kit Rear-caliper rebuild kitJapanese-made rear-caliper kit for the 1980–81 CB900C Custom.View part

Use the correct piston and kit

The listed 42.8 × 41 mm piston matches the 1981 front application and the 1980–81 rear application. Use the 1981 front kit and the separately listed rear kit; a shared piston does not make the kits interchangeable.

Rebuild the cause of sticking or leakage

Inspect the whole caliper rather than replacing seals blindly. Damaged pistons, corroded grooves and sticking sliding parts need attention. Confirm the kit contents and separately source any required pistons or hardware; do not assume a seal kit includes them.

Practical questions

Can fresh seals make a pitted piston serviceable?

No. A damaged working surface can damage the new seal or continue leaking. Inspect and measure the piston and caliper against the correct service information before deciding what can be reused.

Why does the brake still drag after pad replacement?

Sticking pistons or other hydraulic restrictions may remain. Check caliper movement and lever or pedal return, and diagnose the hydraulic system before replacing more friction material.

What should be checked before riding after a caliper rebuild?

Bleed the opened circuit, check for leaks and establish a firm lever or pedal. Confirm the brake applies and releases correctly. If it remains soft, leaks or binds, keep the motorcycle out of service until the fault is resolved.

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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