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  • 18mm Master Cylinder Sight Glass with O-Ring
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18mm master cylinder sight glass with o-ring
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18mm master cylinder sight glass with o-ring

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18mm Master Cylinder Sight Glass with O-Ring

08-0305
$7.15 USD
In stock Usually ships the same or next business day
Custom / universal Fit not confirmed Check details
Questions about this part? Contact us 4.8/5 1,348 store reviews
Secure checkoutProtected payment
60-day returnsEligible unused parts Free ground shippingUSA & Canada over $50
Browse all parts
18mm Master Cylinder Sight Glass with O-Ring
$7.15 USD
Description

Replacement sight glass for keeping an eye on your CB750's brake master cylinder fluid level without cracking the reservoir open. A small but important part of maintaining a healthy braking system — if the original is cracked, cloudy, or leaking, this is the straightforward fix to get things back in order.

Includes the o-ring for a proper seal on installation, so everything you need for the swap is in the box.

Key Features

  • 18mm master cylinder sight glass replacement • Includes o-ring for a proper seal • Allows easy monitoring of brake fluid level • Direct replacement for cracked, cloudy, or leaking originals • Restores your CB750's brake master cylinder to proper working order

Fitment / Compatibility

  • Universal – compatible with Honda CB750 and related classic Honda models fitted with an 18mm master cylinder sight glass

Part Number: 08-0305

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Custom / universal part Fit for your selected bike is not confirmed. Check dimensions and mounting details before ordering.

Free ground shipping over $50

To the USA & Canada. In-stock orders usually ship from our own warehouse the same or next business day.

Estimated ground delivery after your order ships
DestinationDelivery time
USA4–7 business days
Canada2–6 business days

Ground shipping includes tracking, emailed when your order ships. Need it sooner? Express options are available at checkout.

See full shipping details

60-day returns on eligible parts

No restocking fees. Eligible parts must be unused, uninstalled, unaltered and complete. The 60-day window starts when your order is delivered.

Electrical parts are excluded from standard returns. Check return eligibility.

Start your return below. Wait for our instructions before mailing a part back.

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Other shipping options

Canada Post Economy: Available at checkout for select small items. Allow 1–3 weeks for delivery. No tracking or insurance is included.

Outside the USA & Canada: Delivery times vary by destination and shipping method. Buyers are responsible for applicable duties, taxes and import fees. We cannot mark orders as gifts.

Frequently Asked Questions

What is included with the 18mm master-cylinder sight glass?

One 18mm sight glass and one sealing O-ring are included, enough to repair one compatible master-cylinder reservoir.

How do I confirm the 18mm sight glass is the correct size?

Measure the master-cylinder sight-glass opening after removing the old components and compare the glass diameter, recess depth and retaining method. Do not select it from the motorcycle model alone because master cylinders may have been replaced.

What is required after replacing a brake-fluid sight glass?

Protect paint from brake fluid, clean the reservoir, install the glass and O-ring without damaging their sealing surfaces, then refill and bleed the hydraulic system with the specified fluid. Apply firm lever pressure and check closely for seepage before riding.

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