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Bleeding the Brakes, but wont bleed???

Bleeding the Brakes, but wont bleed???

Postby 07BlackOps [OP] » Apr 05 2012, 4:00am

I recently had to replace all the brake lines in my 2001 Chevrolet Silverado 2500HD as well as all new calipers, rotors and pads. Now I despite everything ive tried, I cant get the brakes to bleed. Ive tried even letting the engine run while pumping and have my friend with a vacuum bleeder. Ive bled the master cylinder, but still nothing. Ive read a few places that state I might need to bring it to GM to have them use a scan tool to get the ABS module to start pumping. How do I know if I need to do that and/or what am I missing that the brakes will still not bleed. I know how to bleed brakes this isnt my first time at the rodeo, just really confused how the bleeding process isnt work no matter what I try.
WHEN IN DOUBT, YOU CAN NEVER USE TOO MUCH PB BLASTER!
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Re: Bleeding the Brakes, but wont bleed???

Postby ASTE25 » Apr 05 2012, 11:20am

Make sure you are pulling the brake pedal all the way up when trying to bleed the air from the system. If the pedal is not brought all the way up you will never get all the air out. I would keep trying to bleed them with the engine running as well.
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Re: Bleeding the Brakes, but wont bleed???

Postby chevellemark » May 23 2012, 5:22pm

You can try to bleed them with the abs motor running by taking off the ground wire on the frame which will cause the abs motor to run even with the key out of the ignition.
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Re: Bleeding the Brakes, but wont bleed???

Postby Bubba G » Jun 13 2012, 2:23am

Did you ever get this figured out? I had to replace 2 rusted brake lines from the master cylinder to the abs box and i cannot get mine to bleed either.Even tried a vacuum pump on them. Still no luck. What am i doing wrong. Any help would be greatly appreciated......
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Re: Bleeding the Brakes, but wont bleed???

Postby iogt007 » Mar 28 2013, 1:47am

If the master has gone dry, you will need to start your bleeding at master cyl before going to wheels. If you keep getting air at master, replace it. Rule#1, never release brake pedal with line or bleeder open, never let master cyl reservoir get less than half full. It is best to use a pressure bleeder. If after bleeding and there is no air at wheels, you will need to do an electronic bleed with a scanner such as Tech2, re-bleed with pressure bleeder and do another electronic bleed.
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Re: Bleeding the Brakes, but wont bleed???

Postby GMC2000 » Feb 11 2015, 1:56am

Just had to replace all the rear brake hoses and replace a rusted line in the rear. Also had to replace/repair rusted lines going to and coming out of the ABS unit. I attempted to bleed the system multiple ways with no luck, until! My son and I found a YOU Tube video on how to make a pressure bleeding system out of a insect sprayer. IT WORKED GREAT. Even if your ABS light is on and the ABS is not working. When we hooked up the pressure system we made, I started bleeding from the right rear caliper and loads of air came out. We may have went over board bleeding 6 different time , BUT IT WORKed. Firmest brake pedal I've ever had. All you need is RTV sealant ,a 1/2 gal -1gal insect sprayer 3/8in OD- 1/4in ID clear plastic tubing , hose clamps, Brass 1/8-1/4 mtp hose bard, brass a 1/8 coupling, a new master cylinder cap and gasket and 3-4 QT of brake fluid, Check out You Tube there are multiple videos on how to make one. Cost was between $20 -30 for all the parts. Cap and gasket you can buy at Auto Zone and the rest was brought at ACE Hardware. Good luck.
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Re: Bleeding the Brakes, but wont bleed???

Postby getmore » Feb 15 2015, 1:42am

One method to bleed the ABS pump is to simply find a place where you can brake hard enough to activate the ABS. Then rebleed the brakes the normal way.
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Re: Bleeding the Brakes, but wont bleed???

Postby flynsquirrel » Feb 15 2015, 2:07am

+1 on the pressure bleeders. we got one from summit and it makes the process much easier. The best way to bleed the abs I've seen (other than the dealer) is to cycle it a few times and re-bleed the system, gravel roads work quite well for this.
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