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Old 05-16-2004, 04:49 PM
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brake bleeding with pressure

i have drums all the way around on the chevelle.got the drums calipers shoes and lines replaced, still no brake.they have been bleed several times and there is no fluid lose anywhere in the system.the brake pedal has also been adjusted all the way out but u still have to go to the floor to stop the car.im thinking there is still air in the line somewhere and does midas or any auto repair have a pressurized brake bleeding system to ensure all the air is out the system?

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Old 05-16-2004, 06:01 PM
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Re: brake bleeding with pressure

Quote:
Originally posted by 73chevyhelp
i have drums all the way around on the chevelle.got the drums calipers shoes and lines replaced, still no brake.they have been bleed several times and there is no fluid lose anywhere in the system.
Well.... let's see. You have drums all the way around, and replaced the calipers? That might be part of the problem, as drum brakes don't have calipers.

Seriously, you did not indicate if this was the problem, when you started replacing parts. It also does help to know what it is that is being worked on.

That being said, I would wonder if the master cyl was replaced, and if it was, was it bench bled properly. If it was not replaced, that may be your problem area. I would also consider the procedure you used for bleeding.

As for the question about pressure bleeding, there are some shops that have pressure bleeders. They are very usefull in one man system bleeding. I don't know if any in your area have one. You may want to call around to find out.
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Old 05-16-2004, 06:11 PM
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Is it a power brake system?Do you have good vacuum at the booster?
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Old 05-16-2004, 06:23 PM
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73chevyhelp,

It is air for sure. I had this problem too on my 76 GMC sprint. I borrowed a pressure bleeder and BAM I had brake pedal.

Good Luck
Scholman
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Old 05-16-2004, 08:09 PM
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well if you think it's a air problem then just open all the bleeders on all 4 cylinders. gravity will bleed the system unless you have a blockage. check to see if there is a paportioning valve in the brake lines. it could be stuck. if you see that fluid is coming out of all 4 cylinders then just keep the master cylinder full of fluid and let it bleed. if the pedal still goes to the floor, and the valve is there and good i think i would point at the master cylinder. hope this helps.
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Old 05-16-2004, 09:12 PM
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Did you bother to give an initial adjustment to the adjusters on those shoes? If there's too much travel for the shoes to contact the drums, you'll have a lot of pedal travel, or no pedal at all sometimes.

Don't depend on automatic adjusters to do this for you. You need to get them shoes as close to the drums as possible without dragging, then let the self adjusters do their job of MAINTAINING adjustment.

Make sure the travel on the shoes is right before pointing the finger at the master cylinder. Of course it's very possible it's the master cylinder at fault. But, if you're not getting any air from the bleeders, check the shoe adjustment.
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Old 05-17-2004, 04:22 PM
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bst is right. i kinda figured you had done the adjustments. he is also right on the travel. the perfect travel is to adjust the shoes until you can turn the tire and it stops after one complete revalution. just remember you can't do that unless your drums are perfectly round. hope this helps
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Old 05-19-2004, 11:39 PM
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Quote:
the perfect travel is to adjust the shoes until you can turn the tire and it stops after one complete revalution


if this checks out ok, try pushing the pedal to the floor, let it up, then push it again quickly. if the cups are weak, the pedal "feel" should come back indicating a m/c. also, did you replace the wheel cylinders? i see you said calipers, is this what you meant? just asking because the residual check valves could be leaking back.
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Old 05-20-2004, 07:55 PM
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sorry i replaced the cylinders and not the calipers thinking of disc brakes.the master cylinder was replaced and the entire system was blead several times.i did an initial adjustment of the brakes several times also,the drums will turn almost a full turn before stopping,the calipers are adjusted as tight as possible.i have good pressure to the booster but it is original and th only thing left that hasent been replaced in the brake system.im going to try the pressure bleed then go from there
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