Introduction
If your pressure point is like a melted piece of butter and/or you can pull your lever behind your bar, you should bleed your brakes.
To avoid a mess and getting dirty wear gloves and an old shirt and keep a cleaning cloth on hand. Wear safety glasses to protect your eyes from dust and/or liquids.
What you need
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For easier handling, mount your bike into a bike stand.
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Remove the rear wheel.
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Remove the brake pads from the brake caliper.
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Carefully push back the pistons with a flathead screwdriver.
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Adjust the braking lever to a 45° angle and remove the bleeding screw.
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Fill up a quarter of the bleeding syringe with DOT 5.1 brake fluid. Hold the syringe upright, cover the tip with a shop towel, and gently depress the plunger to purge any air bubbles from the syringe.
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Fill up three quarters of the second bleeding syringe with DOT 5.1 brake fluid. Hold the syringe upright, cover the tip with a shop towel, and gently depress the plunger to purge any air bubbles from the syringe. Mount the second syringe to the braking lever.
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On the caliper side install the hose on the bleeding nipple, then open the nipple 1/2 turn.
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Push the syringe on the caliper. The piston of the lever mounted syringe will come out.
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Repeat the process on the lever mounted syringe until there are no more air bubbles or there is no more dirty liquid coming out of the system.
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If necessary, remove the syringes and re-fill them with fresh liquid and repeat the process.
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When done, tighten the bleeding nipple and remove the hose from the caliper.
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Pull the lever a few times and let it snap.
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Afterwards push the piston of the lever syringe to make sure that the system is filled completely.
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Remove the syringe from the braking lever and install the bleeding screw back to the lever.
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Clean up the lever/caliper with disc brake-cleaner and re-install the brake pads
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