Close Button X Page Heading Polygon location marker icon phone icon Icon arrow down icon of Facebook logo icon of Twitter logo icon of YouTube logo icon of LinkedIn logo icon of Google+ logo icon of Pintarest logo icon of Share logo Get a Quote Icon Download a Brochure Icon Book a Service Icon Specials Icon Finance Icon Book a Test Ride Icon Four Wheeler Icon of two motorcycles from the front Icon of square speech bubble with dollar symbol Harley-Davidson Motorcycle Icon Search our Stock Icon Calculator Icon Icon of Shield and Tick Mark More Content Below Learner Approved Motorcycles (LAM) View Right Arrow Icon of Instagram Logo Icon of Left Arrow Icon of Double Left Arrow TeamMoto Logo TeamMoto Logo New Ultimate Motorbikes Logo Question Mark in a Circle Icon Book a Test Ride Icon Icon of Right Arrow Icon of 3 Horizontal Lines Icon of a 4 square Quandrant Icon of a car Hand Offering Cash Icon Envelope Icon List Symbol of Lines and Dots Icon Calculator Icon Book a Test Drive steering wheel Icon Get a Quote Dollar Icon Icon of a magnifying Glass Icon of a Dollar Symbol Video Click to Start Icon Printer Icon Close Button Circle X Icon of 3.5 star rating Icon of 4 star rating Icon of Empty Star Outline Icon of Filled Star Icon of Half Filled Star Icon of Specials Tag and Star Icon of a Left Arrow for a Carousel Icon of a Right Arrow for a Carousel Icon of a bike Powered by I-Motor - link to I-Motor website Icon of a House in a Circle Icon of a House in a Circle for the Mobile Nav Icon of a Phone in a Circle for the Mobile Nav Icon of an Arrow Pointing Down for the Mobile Nav Icon of an Arrow Pointing Up for the Mobile Nav Icon of Plus Symbol Icon of Minus Symbol Icon of Hamburger to trigger Primary Navigation Icon of Arrow Pointing Left Icon of Home Used on Error Pages
Our Stock
Our Stock

Sy's Harley-Davidson®

Brake fluid guide for H-D® owners

blog large image - Brake fluid guide for H-D® owners

Brake fluid guide for H-D® owners

There aren't many aspects of motorcycle maintenance you can put off, but some are essential to your safety. A late oil change means more wear on your engine and consequently, reduced efficiency. But if you don’t take care of your braking system, the risk of brake failure gets higher.

What brake fluid does

Brake fluid is that magic elixir that allows you to reduce speed in demanding situations, responsible for transmitting force from the brake lever to the brake pads.

Brake fluid classification

Department of Transport grade
Boiling point (dry/wet)

  • Glycol-based: DOT 3 (205/140 °C), DOT 4 (230/155 °C) and DOT 5.1 (270/180 °C). Mixable. However, the boiling point won’t be as high as the highest grade mixed.
  • Silicone-based: DOT 5 (270/190 °C). Non-mixable with any other type of fluid.

The main difference between glycol-based fluids and silicone-based DOT 5 is that glycol is hydrophilic, which means attracts and absorbs moisture from the air, and DOT 5 is hydrophobic, so its service life is longer.

DOT 5 is more expensive than DOT 4 or any other glycol-based fluids. Also, glycol-based fluids can cause damage to the paint while DOT 5 is harmless to painted surfaces.

However, most Harley-Davidson® motorcycles use  DOT 4 as DOT 5 compressibility and viscosity are not suitable for ABS. Remember to use always the recommended grade for your motorbike or higher.

Change your fluid every two years


  • Whenever the brake pedal/lever seems “spongy”.
  • After disassembling the brake line, master cylinder or caliper.
  • Anytime the brake system has been operated in a spongy state caused by boiling fluid, even if the operation has returned to normal.
  • When recommended by the H-D® Service Technicians.

Click here for all our latest service offers