How To Reverse Bleed The Brake Systems On Your Dirt Bike

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How To Reverse Bleed The Brake Systems On Your Dirt Bike - Featured
How To Reverse Bleed The Brake Systems On Your Dirt Bike - Featured

How To Reverse Bleed, Fill Or Replace The Brake Fluid On Your Dirt Bike.

Bleeding Tools And Supplies:How To Reverse Bleed The Brake Systems On Your Dirt Bike - Featured

  • Two Large Syringes
  • Hose
  • Zip Ties
  • Handy Wire
  • Towels
  • Brake Cleaner
  • 8mm Wrench

Pre-Service Notes

  • If you need parts and tools, make sure to buy them here!
  • Pictures with captions are after the steps below.
  • If you need any help don’t hesitate to ask!

Reverse Bleeding Setup

  1. Prep your bike by wrapping the brake caliper and reservoir in a towel, and removing the reservoir cap.
  2. Attach your hose to your filling syringe and secure it with a zip tie, then draw in fresh fluid.
  3. All brake systems have different capacities, so fill your syringe with at least 150ccs.
  4. Turn your syringe, so the hose is facing up, let the fluid settle, then push the fluid to the end of the tube.
1 - Wrap Caliper With Towel
1 – Wrap Caliper With Towel
2 - Wrap Master Cylinder With Towel
2 – Wrap Master Cylinder With Towel
3 - Remove Reservoir Cap
3 – Remove Reservoir Cap
4 - Attach Hose To Syringe
4 – Attach Hose To Syringe
5 - Secure Hose To Syringe With Zip Tie
5 – Secure Hose To Syringe With Zip Tie
6 - Fill Syringe With Brake Fluid To At Least 150cc
6 – Fill Syringe With Brake Fluid To At Least 150cc
7 - Flip Syringe To Purge Air
7 – Flip Syringe To Purge Air
8 - Push Brake Fluid To End Of Tube
8 – Push Brake Fluid To End Of Tube

Reverse Bleed Your Brake Line

  1. Attach the end of the hose to the bleeding nipple, and secure with a zip tie.
  2. You will get some air in the line, but that’s ok, you can usually work it back into the syringe.
  3. Loop the base of your syringe with handy wire, then hang it off your bike.
  4. This setup will allow you to fill and skim in one shot.
  5. Before you start to reverse bleed, remove the contents of the reservoir using your second skimming syringe.
  6. Apply some pressure to your syringe, then open the bleeder valve ¼ to ½ turn.
  7. You want to keep a slow, steady pressure on the syringe. Once the fluid starts flowing, keep an eye on your reservoir.
  8. If you are replacing the fluid, skim the old fluid when it reaches ¾ capacity, and continue until fresh fluid reaches the reservoir, then fill and remove a little more just to be safe.
  9. You can see the difference between the old and new brake fluid.
  10. When you are filling a dry system after a brake service, fill the system until the reservoir reaches ¾ capacity, then skim and fill a few more times to ensure all air is purged.
  11. Install the reservoir cap and bladder with overflow, to remove as much air from the reservoir as possible.
  12. Test your brakes, and if everything feels right, pull the tube and wipe your caliper down with brake cleaner.
9 - Attach Hose To Bleeder Nipple
9 – Attach Hose To Bleeder Nipple
10 - Secure Hose To Bleeder Nipple With Zip Tie
10 – Secure Hose To Bleeder Nipple With Zip Tie
11 - Work Air Bubbles Back Into Syringe
11 – Work Air Bubbles Back Into Syringe
12 - Hang Syringe Off Bike With Wire
12 – Hang Syringe Off Bike With Wire
13 - Remove Fluid From Reservoir
13 – Remove Fluid From Reservoir
14 - Open Bleeder Valve And Inject New Brake Fluid
14 – Open Bleeder Valve And Inject New Brake Fluid
15 - Skim Old Fluid As You Go
15 – Skim Old Fluid As You Go
16 - Old And New Brake Fluid Difference
16 – Old And New Brake Fluid Difference
17 - Install Reservoir Cap WITH Overflow
17 – Install Reservoir Cap WITH Overflow

If you have any questions about brake bleeding, please let me know in the comments or on social.

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