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This master cylinder plug fits into the top of the master cylinder. The plug has a hole in its center to accommodate the hard line that carries the brake fluid from the reservoir.
Note: The master cylinder plug acts as a seal between the brake system and the outside atmosphere. If it is damaged or worn, air may be able to enter the system, which can lead to inadequate braking power.

"Bloom” is a milky dusting of dry powder on the surface of new rubber products. Typically, this is caused by unused vulcanizing agents migrating to the surface of the rubber part. This is often found on new master cylinder plugs. This MUST be thoroughly cleaned prior to installation or a fluid leak will occur. Coating the plug with brake fluid prior to install can help with lubrication and a better seal during and after install.
Orders under $100 cost a flat-rate, $11.95*
*Contiguous United States only. Excludes Hawaii & Alaska.
For orders to Hawaii, Alaska, APO/FPO, Puerto Rico and other US territories, shipping cost will be calculated when possible. If our system cannot automatically calculate a shipping cost, we will call you to approve the shipping cost before your order ships.
International ShippingWe do not ship internationally. We only ship to the USA and it's territories.
You can return most unused, never installed, like-new items for 90 days from the date of receipt. Items must be in like-new condition.
The following items are final sale:
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