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No you do not need to run the engine. To make the job easier if you can get another person to help you pump the brake and hold it down while you release the bleeding screw to let out the air at the brake caliper. Make sure that you have something to catch the driping brake fluid. Repeat this step a couple of time or unit there is no air coming out. You should just see a stream of brake fluid coming out without any gap in between. Do this to all the caliper of wheel cylinder that you had just replace the brakes.

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Q: Do you need to run the engine while bleeding the brakes?
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