nothing but air - The 1947 - Present Chevrolet & GMC Truck Message Board Network

62 Bowtie · 07-09-2009, 11:00 AM

Any ideas? I changed all my brake lines and master upgraded to disc I have not been able to get all the air out of the lines I bench bled the master and the prop valve adjusted the pedal rod to both inner and outer extremes is there a sweet spot or spec for the pedal Im using an air bleeder and still the pedal goes to the floor thanks Tony

70 Suburban · 07-09-2009, 11:16 AM

Just keep an eye on it and gravity bleed them.

jason65 · 07-09-2009, 12:14 PM

When your bleeding the brakes move the pedel slow. Just keep bleeding it. It will get there. I started with the pedel rod on the short side and kept adjusting it longer till I got it where I wanted it. Do you have a leak thats letting air back in?

62 Bowtie · 07-09-2009, 06:09 PM

How do I know if I have an air leak? I did check all my lines and connections for fluid leaks

Alan's Classic · 07-09-2009, 06:19 PM

Quote:

Originally Posted by 70 Suburban

Just keep an eye on it and gravity bleed them.

**aerotruk63** · 07-09-2009, 06:48 PM

When we did my 89 Van. GM asks that you wait 13 seconds between pumps and that it should be one single pump and hold, bleed. We did this for two days. Then we pressure bled the system and got pedal. Next day no pedal. There was the most insignificant leak coming from the front connection on the master. We redid the double flare got it to seal. Got pedal. Gravity Bleed the system and see what happens.

62 Bowtie · 07-09-2009, 07:56 PM

what is gravity brake bleeding

**TR65** · 07-09-2009, 08:30 PM

What everybody else said and....

Make sure the pedal rod is not adjusted in too far, there should be a small gap when the pedal is returned, else the fluid can't return to the resevoir.

I had a bad caliper once that kept letting air in. Replaced it and immediately had full pedal after a short bleed.

Going from manual to power brakes I had to lower the connection to the pedal by one inch (drill new hole) to get the correct stroke and get the brakes to bleed correctly.

Gravity bleed. Just connect tube from bleed valve to a can, open the valve and let gravity pull the fluid through. It is slow but you just have to keep check and keep the resevoir full.

Good luck

TR

jason65 · 07-09-2009, 09:21 PM

Usualy if air is getting in fluid is getting out. Did you have good flow while bench bleeding? If the master is bypassing you get no pedal. On some trucks you got to move the pedal slow. Some got to be running. Some you have to use half strokes. You got any pics of the master, valve, ect. It might help us help you if we could see the system.

70 Suburban · 07-09-2009, 10:31 PM

if you have a vacuum gun you can pull the fluid through.. if you have a harbor freight or northern tool you can get a vacuum gun. he he he

62 Bowtie · 07-09-2009, 11:43 PM

Heres a pic thanks for the tips (hey that rhymes)

protrash64 · 07-09-2009, 11:56 PM

I'm not a brake expert....but have you pushed in the button on the prop to let the fluid thru? I was told this released the bias for bleeding. Dont know for a fact or not.

**MikeN** · 07-10-2009, 02:40 PM

The bleeder screws have to be at the top. If you have the calipers reversed (i.e. on the wrong side) the caliper bleeders will not be at the high point and you will never get the air out. Ask me how I know

07-09-2009, 11:00 AM	#1
62 Bowtie Registered User Join Date: Nov 2008 Location: Elk Grove Ca Posts: 629	nothing but air Any ideas? I changed all my brake lines and master upgraded to disc I have not been able to get all the air out of the lines I bench bled the master and the prop valve adjusted the pedal rod to both inner and outer extremes is there a sweet spot or spec for the pedal Im using an air bleeder and still the pedal goes to the floor thanks Tony

07-09-2009, 11:16 AM	#2
70 Suburban Rods Join Date: Nov 2002 Location: Bryan, TX Posts: 1,398	Re: nothing but air Just keep an eye on it and gravity bleed them. __________________ Just keepin it simple. 1965 C-10 Ext cab build. 350??(Does it count at 2 truck if I had to cut one up?) 1966 C-10 lwb 283 auto 1970 Suburban in pieces 1971 Blazer 4wd....restore someday. all factory CST 1972 Blazer 4wd parts truck still a roller 1972 GMC Sierra Grandee 1998 Chevy ext driver. 2005 F**D the wife drive...(cant fix women)

07-09-2009, 12:14 PM	#3
jason65 Registerd User Join Date: Sep 2008 Location: Oklahoma Posts: 2,118	Re: nothing but air When your bleeding the brakes move the pedel slow. Just keep bleeding it. It will get there. I started with the pedel rod on the short side and kept adjusting it longer till I got it where I wanted it. Do you have a leak thats letting air back in?

07-09-2009, 06:09 PM	#4
62 Bowtie Registered User Join Date: Nov 2008 Location: Elk Grove Ca Posts: 629	Re: nothing but air How do I know if I have an air leak? I did check all my lines and connections for fluid leaks

07-09-2009, 06:48 PM	#6
aerotruk63 Check The Champ, Demonstrator Join Date: Jun 2009 Location: Montreal,Quebec Posts: 6,627	Re: nothing but air When we did my 89 Van. GM asks that you wait 13 seconds between pumps and that it should be one single pump and hold, bleed. We did this for two days. Then we pressure bled the system and got pedal. Next day no pedal. There was the most insignificant leak coming from the front connection on the master. We redid the double flare got it to seal. Got pedal. Gravity Bleed the system and see what happens. __________________ 1963 *Chevrolet Truck* Literature LINK: https://picasaweb.google.com/113840717762774560215 YouTube Channel with 20+ Original *Chevrolet Truck* Salesmen, Mechanics & Service Department Training Slideshows. https://www.youtube.com/results?sear...otruk63&page=1

07-09-2009, 07:56 PM	#7
62 Bowtie Registered User Join Date: Nov 2008 Location: Elk Grove Ca Posts: 629	Re: nothing but air what is gravity brake bleeding

07-09-2009, 08:30 PM	#8
TR65 Senior Member Join Date: Nov 2007 Location: Greenville, SC Posts: 873	Re: nothing but air What everybody else said and.... Make sure the pedal rod is not adjusted in too far, there should be a small gap when the pedal is returned, else the fluid can't return to the resevoir. I had a bad caliper once that kept letting air in. Replaced it and immediately had full pedal after a short bleed. Going from manual to power brakes I had to lower the connection to the pedal by one inch (drill new hole) to get the correct stroke and get the brakes to bleed correctly. Gravity bleed. Just connect tube from bleed valve to a can, open the valve and let gravity pull the fluid through. It is slow but you just have to keep check and keep the resevoir full. Good luck TR __________________ 1965 C10 SWB Fleet Two owner LS2 Swap Thread http://67-72chevytrucks.com/vboard/s...d.php?t=413880

07-09-2009, 09:21 PM	#9
jason65 Registerd User Join Date: Sep 2008 Location: Oklahoma Posts: 2,118	Re: nothing but air Usualy if air is getting in fluid is getting out. Did you have good flow while bench bleeding? If the master is bypassing you get no pedal. On some trucks you got to move the pedal slow. Some got to be running. Some you have to use half strokes. You got any pics of the master, valve, ect. It might help us help you if we could see the system.

07-09-2009, 10:31 PM	#10
70 Suburban Rods Join Date: Nov 2002 Location: Bryan, TX Posts: 1,398	Re: nothing but air if you have a vacuum gun you can pull the fluid through.. if you have a harbor freight or northern tool you can get a vacuum gun. he he he __________________ Just keepin it simple. 1965 C-10 Ext cab build. 350??(Does it count at 2 truck if I had to cut one up?) 1966 C-10 lwb 283 auto 1970 Suburban in pieces 1971 Blazer 4wd....restore someday. all factory CST 1972 Blazer 4wd parts truck still a roller 1972 GMC Sierra Grandee 1998 Chevy ext driver. 2005 F**D the wife drive...(cant fix women)

07-09-2009, 11:43 PM	#11
62 Bowtie Registered User Join Date: Nov 2008 Location: Elk Grove Ca Posts: 629	Re: nothing but air Heres a pic thanks for the tips (hey that rhymes) Attached Images

07-09-2009, 11:56 PM	#12
protrash64 Resistance is Futile Join Date: Dec 2006 Location: Mesa,Arizona Posts: 3,520	Re: nothing but air I'm not a brake expert....but have you pushed in the button on the prop to let the fluid thru? I was told this released the bias for bleeding. Dont know for a fact or not. __________________ 64 CHEVY PICK-UP > http://67-72chevytrucks.com/vboard/s...otrash+re-hash 64 CARRYALL >http://67-72chevytrucks.com/vboard/s...=1964+suburban 66 LB >http://67-72chevytrucks.com/vboard/s...d.php?t=427852 STRENGTH/DETERMINATION/MERCILESS/FOREVER .......posted via stationary device

07-10-2009, 02:40 PM	#13
MikeN Senior Member Join Date: Oct 2007 Location: Marietta, GA Posts: 799	Re: nothing but air The bleeder screws have to be at the top. If you have the calipers reversed (i.e. on the wrong side) the caliper bleeders will not be at the high point and you will never get the air out. Ask me how I know



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