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Road Star Rear Brake System Flush 101
Topic Started: May 26 2014, 08:17 PM (860 Views)
tibadoe
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NOTE: Please read this WARNING before beginning any work.

This post documents my rear brake system flush on my 2009 Road Star Silverado S. This procedure should work with most bikes without ABS. Pretty simple process which only took about 30 minutes to complete. My owners manual states this should be done every 2 years.

I used the same brake line bleeder as I used when I did the front brakes. I used the half bottle I had left over of the Prestone Dot 4 synthetic fluid. One bottle will be enough to bleed both front and rear brakes.

A clean work shop area with some elbow room on the right side of bike should be all you need for this session. If you have been out riding let the bike cool off since you will be working around the mufflers.

1. With the bike on the kick-stand the master cylinder is pretty close to level. I removed the right rear hard bag for easier access. Cover the exhaust and any chrome or painted surfaces in the area of the bleeder screw and around the front master cylinder to keep any spilled or splashed fluid from coming in contact with paint or chrome.

2. Remove the bolt and cover securing the rear master cylinder to frame.

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3. Remove the rubber plunger under cap and inside master cylinder.

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4. Use the bleeder vac and vac out all fluid in rear master cylinder.

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5. Slide the 8mm box wrench over the bleeder screw.

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6. Attach the rubber bleeder line onto the bleeder screw. Make sure it is secure and won't slip off when you open the screw with the box wrench.

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7. With bleeder screw still closed, pump vac up to about 10-15 lbs.

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Edited by tibadoe, May 6 2018, 01:26 PM.
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tibadoe
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8. Open bleeder valve and keep pumping vac until about 1 - 1.5 ounces of brake fluid is extracted. (Notice old fluid is dark golden color.) Close bleeder screw before vac pressure returns to 0 psi. Refill master cylinder with fresh fluid.

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9. Repeat step 8 and vac out another 1 to 1.5 ounces of fluid (or until nice and clear like the pic below.) Remember to keep an eye on the master cylinder to make sure you don't empty it and start drawing in air. Make sure to keep the master cylinder filled with fresh fluid. After taking out a total of about 3 to 4 ounces of fluid, brake line should be totally flushed and fluid clear in color.

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10. Do a final top off of fresh fluid. Insert rubber plug, screw on the cap.

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11. Make sure bleeder screw is tight. Remove rubber bleeder hose and box wrench. Push rubber plug back onto the rear bleeder screw.

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12. With cap secured pump rear brake a few times to check for firmness. Pedal should be firm and not spongy.

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13. Yes - the cylinder is full of fresh fluid. It did not look that dirty but it was. Compare it to the first few photos above to see the difference in color.

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14. Snap cover in place over master cylinder and tighten screw as necessary. Attach rear hard bag to bag rail. Take a test ride to check the rear brake.

Road Star Front Brake System Flush 101 - Click Here
Edited by tibadoe, May 6 2018, 08:43 AM.
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