Motorcycle Brake Repair: Replacing Bleeding Front Brake Fluid on a 2008 Harley Davidson Road Glide

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*Always follow the instructions in your repair manual when doing repair or maintenance work on a motorcycle. Manuals can be found at the dealer and online.*

In this video I show how to use a vacuum pump to remove and replace the brake fluid on a 2008 Harley Davidson Road Glide. This bike does not have ABS, and this technique can be used to remove air from the brake system or bleed the brakes. The brand of the vacuum pump used is Mityvac.

A clear hose is connected to the vacuum pump and the other end is connected to a reservoir to catch the brake fluid. Another clear hose is connected to another connection point on the reservoir, and the other end of the hose is connected to the brake bleeder valve on the caliper. The process is to create a 10Hg pressure on the pump, than open the brake bleeder valve. Brake fluid will be drawn out of the brake system and is captured on the reservoir. When all the brake fluid is drawn out of the brake fluid, air will appear in the hose connected to the brake bleeder screw. The brake bleeder valve can than be closed and the vacuum pump hose removed from the valve. The process is repeated on the other caliper.

When all the old brake fluid is drawn out of the system, the reservoir is filled with new brake fluid and the vacuum pump is used to draw the new fluid into the brake system. The setup and process is similar to previous steps, only this time air will disappear from the brake fluid when new brake fluid has filled the brake system. The brake fluid reservoir must always have brake fluid in the reservoir, or air will enter the system and you will need to start over.

This same process can be used to bleed the brakes. The process is to fill the brake fluid reservoir, and attach the vacuum pump to the brake bleeder valve and extract brake fluid until air disappears from the fluid. When that happens close the brake bleeder valve and remove the vacuum pump. Repeat the process on the other caliper and than check the brake lever to make sure it is firm. Always make sure the reservoir contains brake fluid during this process, otherwise air will be introduced into the brake system, and you will need to start over.

Thank you for Watching!