Question about 1989 Chrysler New Yorker

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Do you need to run the engine while bleeding a car with power brakes?

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  • Bushwhackban Apr 25, 2009

    Hello dscd4, thank you I just today tried it with the car running and with not much luck I guess I'll try it again later tonight.

    My car is a 1956 Chrysler not an 89 but I guess it will be the same.

    Thank you for you reply to my question.

    Busch

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No, you do not! you need to build up pressure in the lines, then bleed them. With the car running you will never be able build up the pressure.

Posted on Apr 25, 2009

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1 Answer

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The vacuum booster (engine running) is telling you that you need to bleed them better.
Not bleeding them longer allows air to stay trapped in the lines and the air doesn't make much difference until the engine is providing vacuum boost to the brake system.

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try bleeding the brakes with the engine running there may still be some air in the system. make sure the master cylinder doesn`t run out of brake fluid.

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There is no need to bleed anything if only replacing rotors and pads. I suspect you got air in the system when trying to bleed it. Im only guessing here, I cant see what you did.
When motor is running the engine provides a power boost to the pedal. When engine is off there is no power boost, so pedal feels heavy, but does not mean brakes are working then.

I suggest you watch this Youtube video on correct way to bleed brakes, and hopefully fix the problem.
http://www.youtube.com/watch?v=LgxMfQUMdJY&feature=related

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I have installed new rear brake shoes and new wheel cylinders on both sides. I have bled the brakes. Good pedal when engine is off...no pedal at all when engine is started. Bled brakes 4 times.


When engine is running you have a power booster in operation. Without power booster brake pedal will be heavy. With engine running, do NOT press pedal really hard. Just normal firmness. If pedal goes to floor or just too low, it needs bleeding.

Are you sure you did not run the resovior dry?
I would think would not hurt to check the correct procedure for bleeding rear brakes. Here is a YouTube video which should help. http://www.youtube.com/watch?v=8T7Qrz3zJno

The other possible issue is the master cylinder piston is not sealing well. Might be a good idea to flush it with fresh fluid, but I imagine you have already if you bled it 4 times.

The way I was taught is this. Two persons method. To prevent mess, put a flexible tube over the nipple and drain it to a jar.
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