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Brake Bleeding Question.

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Jay87T

01-29-2008 17:38:36

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when brake bleeding power brakes with 2 people, one pushing the brake down and the other working the caliper bleeding screw, should the engine be running or can you it with the engine off?

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01-30-2008 09:57:55

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Re: Brake Bleeding Question. in reply to Jay87T, 01-29-2008 17:38:36

No need to have running. The vacuum side is just for the power booster-running engine has nothing to do with the fluid in the reservior or bleeding the air from the lines. With the engine running just a bigger chance to get run over. Follow Glennster reply for bleeding the brakes and you'll have no problem!!

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flying belgian

01-30-2008 06:52:56

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Re: Brake Bleeding Question. in reply to Jay87T, 01-29-2008 17:38:36

If doing it with engine running make sure you open garage door half way. Don't need to read about you and your helper in the obits.

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flying belgian

01-30-2008 06:52:08

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Re: Brake Bleeding Question. in reply to Jay87T, 01-29-2008 17:38:36

If doing it with engine running make sure you open garage door half way. Don't need to read about you in the obits.

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bradk

01-29-2008 19:08:20

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Re: Brake Bleeding Question. in reply to Jay87T, 01-29-2008 17:38:36

I've always done it with engine off.Pro'ly the biggest advantage is you can hear the commands ie. pump/hold better from the guy at the bleeder.

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dave guest

01-29-2008 18:58:33

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Re: Brake Bleeding Question. in reply to Jay87T, 01-29-2008 17:38:36

Jay87T, On some cars you must bleed using only very short stroke like 1/2 inch on pedal by hand, engine not running. Can't remember if this is to protect master cyl or brake cyl from overtravel and damage. But normal bleeding on these cars will cause damage. I KNOW. Hate doing something twice or three times over.

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dave guest

01-29-2008 18:58:06

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Re: Brake Bleeding Question. in reply to Jay87T, 01-29-2008 17:38:36

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glennster

01-29-2008 18:37:51

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Re: Brake Bleeding Question. in reply to Jay87T, 01-29-2008 17:38:36

we have a power bleeder and a vacuum bleeder at the shop. both work good. i prefer to have one guy pump the pedal, the other guy crack the bleeder. pia to set the other ones up. have the motor off, cap on resevir loose, 3-4 long steady pumps of pedal, hold down, open bleeder, let pedal drop, hold pedal on floor, close bleeder. repeat till no more air. start on rt rear, then lt rear, then rt front, end at left front. bleed furthest wheel from master first, work to the shortest line last. fast , simple, effective, cheap, and somebody to chat wit when your workin!! pump em, hold em, pump em hold em, !!!!

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Charles (in GA)

01-29-2008 18:31:28

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Re: Brake Bleeding Question. in reply to Jay87T, 01-29-2008 17:38:36

Works either way, might have a better feel to the pedal if the engine is running, but otherwise, you get the same result.

Charles

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Lee in Iowa

01-29-2008 18:29:07

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Re: Brake Bleeding Question. in reply to Jay87T, 01-29-2008 17:38:36

NAPA and other parts houses have an inexpensive kit for bleeding that's just a hose you stick on the bleeder that connects to a small bottle you hang on the vehicle. You push the hose far enough into the bottle that it is in the fluid so it doesn't suck air back in when you let the pedal up. Lee

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Goose

01-29-2008 17:54:45

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Re: Brake Bleeding Question. in reply to Jay87T, 01-29-2008 17:38:36

I have one of the vacuum pumps used for bleeding brakes, finding vacuum leaks, etc.

It works good for bleeding brakes. Also, gravity bleeding works good. To gravity bleed, just take the lid off the master cylinder, set a pan or can under the wheel cylinder, open the valve, and wait until pure fluid comes out with no air bubbles. In severe situations, you might need to monitor the level of the fluid in the master cylinder and add some as necessary.

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Jay87T

01-29-2008 17:42:08

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Re: Brake Bleeding Question. in reply to Jay87T, 01-29-2008 17:38:36

Oh and follow up question, anyone use one of these vacume pump kits to bleed thier brakes, I have one aswell, never used it yet, do you guys get good results with these?

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Slowpoke

02-02-2008 10:53:53

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Re: Brake Bleeding Question. in reply to Jay87T, 01-29-2008 17:42:08

1. DO NOT get fluid in the vac pump. 2. Get a STURDY plastic jar with lid of at least one quart like an applesauce jar. Buy two small brass feed thru nipples at the hobby shop (be sure they fit your kit tubing) and install them in the lid. Using 2' of new clear tubing, connect the pump to one of the nipples. Using 3-4' of new clear tubing, connect the bleeder to the other nipple, after draping it over the tire or something higher than the wheel cylinder. The larger jar will will usually sit on the ground and not flop around like the small kit jar, and it will hold 10 times the fluid so it can't be drawn into the pump. No need to have any tubing inside the jar. Just be sure the jar seals well to draw a vacuum.

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david - or

01-29-2008 17:59:15

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Re: Brake Bleeding Question. in reply to Jay87T, 01-29-2008 17:42:08

I find a vacuum pump with a big reservoir works great for bleeding brakes.

It is indispensable for Ford hydraulic clutches -- you can pump the darn clutch pedal for all you're worth, but you'll never get the bubble of air out of the top of the clutch master cylinder using the standard method. The clutch ends up mushy even when you follow the factory service manual to the letter.

Hook up the vacuum bleeder and slurp out the air and nasty fluid, and you'll never go back to the "OK, push the pedal down" two person method.

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Marlowe

01-29-2008 17:40:17

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Re: Brake Bleeding Question. in reply to Jay87T, 01-29-2008 17:38:36

best running but can be done with out

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