Brakes won't bleed - Chevelle Tech
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post #1 of 16 (permalink) Old Feb 10th, 13, 12:55 PM Thread Starter
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Brakes won't bleed

I replaced my power brake booster and got my m/c and everything painted up real pretty.I go to bleed the brakes today(with the wife pumping the pedal)and for some reason,I can't get fluid to come out at any of the wheels.In fact,I couldn't even feel air coming out when she was pumping.I thought I had bench bled the m/c correctly but,now I'm starting to wonder.
Do I need to rebleed the m/c or is my problem somewhere esle?
I did remove the lines from the m/c down to the block on the frame so I could clean them up but,after I cleaned them up,I just reinstalled them.So,really,nothing changed and everything was working fine before.

Mark
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post #2 of 16 (permalink) Old Feb 10th, 13, 1:06 PM
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Re: Brakes won't bleed

Why not just open up the bleeders on the 4 wheels and let it gravity bleed. Keep an eye on the fluid level in the MC...
Also make sure the brake pedal pushrod is adjusted correctly...not applying any pressure with the pedal at rest.

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post #3 of 16 (permalink) Old Feb 10th, 13, 1:17 PM Thread Starter
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Re: Brakes won't bleed

Bill,Are you saying open all four bleeders at once and close them as the fluid comes out of each one or,should I start at the fartherest away and do them one at a time?

Mark
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post #4 of 16 (permalink) Old Feb 10th, 13, 1:24 PM
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Re: Brakes won't bleed

All @ once...just monitor fluids closely. Don't let the MC go dry. You can leave the cap off when doing this. Close a bleeder when fluid appears.
Works great for me even when first filling a completely brand new set of lines.
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post #5 of 16 (permalink) Old Feb 10th, 13, 1:32 PM Thread Starter
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Re: Brakes won't bleed

I think I'll try your method.
I've got speed bleeders on my car right now.I'm guessing I should trash those and go back t0 the stock ones before I go any farther.
The speed bleeders worked great for me when I replaced my rear but,I don't they would work for gravity bleeding.

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post #6 of 16 (permalink) Old Feb 10th, 13, 1:47 PM
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Re: Brakes won't bleed

Also helps too if the front of the car is up on ramps or jack stands...raised higher than the rear.
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post #7 of 16 (permalink) Old Feb 10th, 13, 1:57 PM Thread Starter
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Re: Brakes won't bleed

Thanks Bill,
I know now what I'll be doing tomorrow on my day off from work.
I'll post the results.

Mark
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post #8 of 16 (permalink) Old Feb 10th, 13, 2:02 PM
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Re: Brakes won't bleed

I think you have to bench bleed the MC first. Search that topic to learn technique. Autozone carries a bench bleeder kit that is simply a set of tubes that connect to the two outlets on the MC and loop back into the reservoir. You clamp the master in a bench vice (hence the term "bench" bleeding) and force the piston in and out with a blunt object to bleed ALL the air out of the MC before you connect it to the rest of the brake system. I used a big screwdriver with a rubber cap on the sharp end so as not to damage the piston. Good luck!

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post #9 of 16 (permalink) Old Feb 10th, 13, 8:40 PM
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Re: Brakes won't bleed

If you didn't bench bleed it, don't worry, you don't have to remove it. Just bleed it in the car but "nice and easy!"
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post #10 of 16 (permalink) Old Feb 10th, 13, 9:13 PM
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Re: Brakes won't bleed

i jack mine up ,put on jack stands take 4 small cups ,glass jars ext ,4 1/4 clear hoses fill up each jar 1/2 way crack bleeder screw ,open master up fill up and go in house,drink beer go to bed ,wake up close bleeder screws ,fill master back up,u rested and done.

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post #11 of 16 (permalink) Old Feb 11th, 13, 3:36 PM Thread Starter
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Re: Brakes won't bleed

Okay,here's an update on my brake bleeding situation.
I removed the m/c and RE bench bled it.Bubbles all out,no problem.I put the m/c back on the car,hook up the brakes and decided to give the gravity bleed method a try.Well,after about two hours,nothing.No fluid coming out at the bleeder screws at all.
So,I go to Sears and buy a Mityvac.I'm thinking this has got to be the answer.
It's not.Still no fluid coming thru.

Soooo,now what?
I'm thinking it's got something to do with the combo valve down on the frame rail.
Here's a picture of the valve I'm talking about.Could it have gone bad?
The brake line is not as close as it looks to my header,just a weird angle to take a picture.

Mark
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post #12 of 16 (permalink) Old Feb 11th, 13, 4:00 PM
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Re: Brakes won't bleed

take the master loose, pull it forward off the studs. put 2 or 3 flat washers on each stud, put the master back on. try it again. this is a temporary diagnostic aid to determine if the rod that goes into the back of the master is wrong on the new booster. sounds like you may have a problem with the master not releasing all the way. if the rod is too long the master won't pass fluid properly. Did I mention temporary?

You could also compare the new and old boosters, see if they have the same length rod on the front.

you can also try loosening the master so it'll pull out on the studs, then push it back in. it should seat flush on the booster without the rod hitting the piston in the master. If the rod is preloaded there will be troubles.

The combo valve on the frame, there's nothing that can go wrong with it that blocks off fluid to both ends of the car at the same time. forget it, what's changed here since the brakes worked right is the booster.

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post #13 of 16 (permalink) Old Feb 11th, 13, 4:06 PM Thread Starter
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Re: Brakes won't bleed

Tom,I've already compared the old and new rod lengths,they are exactly the same.

You say the combo valve blocks off fluid to both ends at the same time?
I'm not getting any fluid out of any of the four wheels at all.Could that be it?

Mark
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post #14 of 16 (permalink) Old Feb 11th, 13, 7:09 PM
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Re: Brakes won't bleed

I said:

"The combo valve on the frame, there's nothing that can go wrong with it that blocks off fluid to both ends of the car at the same time. forget it, what's changed here since the brakes worked right is the booster."

I'd try the spacer/washer trick.

with the master bolted on as now, no spacers, will fluid run out of the brake line fittings if you loosen the lines? If so, go down to the block, loosen the inlet fittings, fluid should run out. If it does, loosen the outlet lines, fluid should run out.

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post #15 of 16 (permalink) Old Feb 11th, 13, 7:51 PM
von
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Re: Brakes won't bleed

Just something to check here. A few years ago a friend converted his Chevelle from manual to power drums and couldn't get the brakes to work. It turned out the new booster had some kind of seal or cover on the back of it that was supposed to be removed but wasn't. Bottom line is, the booster must be able to "breathe" on the back side for air to enter it when the diaphram moves toward the front when the pedal is depressed. The styrofoam looking thing on the back of the booster must be unobstructed. That's where the air enters. The symptom was the pedal was very hard to depress.

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