Viscosity-stable across highest range of operating temperatures.4 oz size is perfect for home mechanic use. Item Specifications: Volume, 4,

Hayes Dot 5.1 Brake Fluid 4 OZ Size Is Perfect For Home Mechanic Use

Reference Number: 3OW3MQ

Upgrade your bicycle maintenance routine with Hayes Dot 5.1 Brake Fluid, the premium hydraulic fluid designed for high-performance bike braking systems. This 4 oz (118ml) bottle is the perfect size for home mechanics and bike shops alike, ensuring you have reliable, professional-grade brake fluid on hand for optimal stopping power and safety.

Materials & Performance & Engineering:

Manufactured to meet DOT 5.1 specifications, Hayes Dot 5.1 Brake Fluid is a high-quality, synthetic hydraulic fluid engineered for continuous, consistent performance in demanding cycling conditions. Its advanced formulation provides excellent thermal stability, low compressibility, and exceptional lubricity, minimizing brake fade and ensuring responsive, reliable braking even during extended rides or technical descents.

Components & Technology:

This DOT 5.1 brake fluid is compatible with a range of hydraulic brake systems, including Hayes Dominion and other DOT 5.1-compatible setups. Its engineered chemistry prevents moisture absorption and corrosion within brake calipers and master cylinders, extending component lifespan while maintaining peak performance. The fluid's high boiling point (over 300 C) ensures safe operation under heavy braking, protecting your system from vapor lock and maintaining consistent feel.

Style & Use Case:

Ideal for mountain biking, road cycling, and cyclocross, Hayes Dot 5.1 Brake Fluid is an essential for maintenance, repair, or upgrades of your hydraulic brake system. Its clear, viscosity-maintaining consistency makes bleeding and topping off your brakes straightforward, ensuring your bike remains responsive and safe on every ride.

Innovative & Differentiating Features:

Formulated specifically for high-performance hydraulic systems, this DOT 5.1 brake fluid supports advanced braking performance, safety, and durability. Its compact 4 oz size is perfectly tailored for home mechanics, hobbyists, and professional bike shops seeking reliable, easy-to-use brake fluid for routine maintenance or brake system rebuilds.

Optimize your bike's braking performance with Hayes Dot 5.1 Brake Fluid-engineered for safety, stability, and peace of mind on every ride.

  • Premium DOT 5.1 Brake Fluid formulated for optimal performance in Hayes Dominion and other high-performance brake systems, ensuring reliable braking and safety.
  • Made from high-quality, automotive-grade hydraulic fluid materials designed to resist high temperatures and prevent fluid breakdown under aggressive riding conditions.
  • Engineered with advanced glycol-based technology, Hayes Dot 5.1 Brake Fluid offers superior lubricity, consistent braking response, and corrosion protection for all compatible hydraulic brake components.
  • Compact 4 oz size makes it ideal for home mechanics, providing easy handling, precise volume control, and maintenance convenience for bicycle and motorcycle brake systems.
  • Compatible with a wide range of DOT 5.1 brake systems, this fluid ensures smooth, fade-free braking performance, perfect for upgrading or maintaining your bike's hydraulic brakes.

Why 365 Cycles?

365 Cycles is an Authorized Hayes Dealer, and we offer the Full Hayes Warranty!

Fast Shipping!

Professional Customer Service- available 7 days a week
Check out our 200,000+ amazing reviews!

365 Cycles delivers all your cycling needs fast! We don't waste time preparing your order. Our priority is to serve our customers first and foremost. If you need help picking the right product, have questions about bike component compatibility, or just want to geek out about bikes we are here 7 days a week! Simply put, we are bike experts from dirt to tarmac and want to make sure you get the full 365 Cycles experience when you shop with us.

At 365 Cycles our mission is to simplify the shopping experience. We want to get you the right product in a quick time frame and be here if you need help with questions, warranty, friend to talk to, etc.

We’re dedicated to building lasting relationships with our customers, communities, and team members. We combine the knowledge and service of a traditional bicycle shop with the convenience of shopping in your own home.





Shipping & Handling

Most orders placed during the workweek before 1:30 pm EST ship the same day, but in rare cases (peak season/holiday periods) handling time can take up to 48 hours. If you have questions regarding shipping estimates, please let us know prior to placing your order. There is a direct signature requirement for all orders over $500.

Please allow 1-2 business days for your order tracking to update.

  • Cut off for SAME DAY SHIPPING- 1:30 pm EST Monday - Friday
  • Friday afternoon -Sunday orders ship the following Monday
  • Due to carrier restrictions orders shipped to: PO Box, HI, AK, & PR 365 Cycles may use a comparable service to what was selected.

Combined Shipping Discounts

To offer customers savings on shipping, we offer discounts when shipping multiple items from our store. We cannot issue refunds on shipping once an order is finalized so please follow the 5 steps below and ask if you are having trouble with the discount before you make a purchase.

  1. Be sure you are using the US site: https://www.ebay.com
  2. Select Add to Cart (instead of Buy It Now) with items from our store 365Cycles
  3. Click on Proceed to Checkout. On the checkout page, the shipping service on each line item needs to match
  4. Compare First Class vs Priority as sometimes Priority can be cheaper and it gets to you faster!
  5. You’ll need to change the shipping method to Priority on every item in your cart before the rate can be calculated.

Returns

365 Cycles offers returns for 30 days on new items in their original, intact packaging. Return shipping for ALL orders are to be paid by the buyer. Please be sure to read our return policy entirely and if you have any questions, please contact Customer Service.

Full refunds are issued on items that are brand new and we are able to resell as new. 365 Cycles reserves the right to deny returns that are outside of policy including, but not limited to, used items, items missing original packaging, items with damaged manufacturer packaging, or international orders. Return orders must be shipped in a box or bubble mailer. Items shipped without an outer box will incur a restocking fee. You will be contacted through eBay if your return is ineligible for a full refund.

Returns must be initiated within 30 days from purchase date through your Purchase History under My eBay.

If we make an error in shipping, please contact us -- we will ship out the correct item and provide a free prepaid return label as quickly as possible!

Exchanges

If you need to exchange your order, the fastest and easiest way to do this is to reorder. We will ship your new order immediately and, in the meantime, please initiate a return through eBay on the original item and return it. We will refund for the returned item once it is received back.



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Company Details

365 Cycles
1180 Enterprise Rd
East Petersburg, PA 17520
United States

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