Question about Chevrolet K2500

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I am trying to bleed my front brakes and I keep gettting air in the line. when everything is shut and I pump the brake I hear air in the master cylinder. does that mean it is the master cylinder? 1978 chevy truck

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  • h888d Mar 24, 2011

    i had someone inside pushingon the brake pedal. I did keep the master cylinder topped off with fluid. i will probably try and do it myself with one end of a hose on the nipple and the other in a can of brake fluid. i do not see any leaks from anywhere throughout the brake system. when i pump the brakes with the engine off I do not get any pressure build up. Could this be the vaccum line from the power booster to the carb? thanks for your advice.

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You have to keep master cylinder topped up as you bleed brakes
start at the furthest wheel from master cylinder slow pumps on the pedal holding down as your companion opens open bleed nipple'if your doing it yourself open bleed screw and fit small tube over nipple and put tube into small container half filled with brake fluid and just pump pedal yourself goodluck

Posted on Mar 24, 2011

  • richochet Mar 24, 2011

    bleed with engine off

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Are you bleeding the brakes by yourself? If so, how are you performing this?

Posted on Mar 24, 2011

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2007 ford sport trac 4.0 2wd just put brakes all the way around bleed brakes brake lines not leaking still brake pedel goes almost to the floor to stop disk front and back done everything right


obviously not or you would have brakes

there is still air in the lines and that can be from a master cylinder that has an air lock and is not allowing fluid to pump

Take it to an accredited brake specialist for diagnosis and brake bleed

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1992 f-250 brake pedel go's to the floor when applyed. I installed new master cylinder & brake booster new rear brakes all new front ok no leaks.


Did you remember to bench bleed the new master cylinder before installing it on the truck, to get all the air out of it?

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I have replaced all brake parts including front brake hoses and let all the brake fluid to drain out of the master cylinder. Went to bleed the brakes and it appeared to bleed all air out of the lines etc.....


U forgot to bleed the BRAKE MASTER! When ur bleeding the brakes, make sure ur engine is RUNNiNG. I f u haven't got any BLEEDiNG tools that sucks all the fluid in ur car, try Bleeding first the master, 2nd will be the front wheel brakes, and the REAR brakes! If everything FAiLS go to ur nearest garage and have them fix it! Drive slowly, using ur engine and hand brake! Hope that helps u out!

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I am having trouble bleeding my brakes on a ford courier there is no pedal there when i have bled the brakes and i have also tryed changing the master cylinder and it is the same


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When bleeding my brakes do I have to take all the fluid out of the master cylinder and refill it before moving on to the bleeders or can I go straight to the bleeders and wok from there? Will I be able to...


The purpose of bleeding brakes is to remove air pockets from the brake lines. You do not need to do anything with the master cylinder. You need an assistant to help you bleed the brakes. Have the assistant pump the brakes a couple times and then hold the pedal down. You open the bleeder and the air and fluid will come out, then close the bleeder. You r assistant can then release the pedal and start again by pumping the pedal and then hold it. You open the bleeder again. You repeat this process until only fluid comes out of the bleeder. Do it for each tire.

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You need to make sure you have an assistant. The assistant keep adding fluid and pumping the brakes while you operate the bleeder screws.

The procedure--LF,RF,LR,RR (left front, right front,etc). You are moving from the shortest brake line closest to the master cylinder to the longest brake line furthest from the master cylinder. Use an aquarium air hose (12 inch length), and a clear jar to catch the brake fluid. When no more bubbles escape through the hose, the caliper or cylinder is properly bled.

If the level drops below the LOW mark, air may reenter the system. Keep the reservoir full by checking after each bleed!

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