68 Chevelle drum brake problem - Chevelle Tech

Brakes, Suspension & Steering Conversion questions & more.

 
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post #1 of 9 (permalink) Old Jun 25th, 03, 5:18 PM Thread Starter
 
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I posted about a week ago because my front right drum brake was locking up and that was because of the rubber hose that goes from the cylinder to the frame.

Now the problem is that brakes don't start to engage until the pedal is halfway to the floor and at the floor the car still doesn't stop all the way. Any ideas?
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post #2 of 9 (permalink) Old Jun 25th, 03, 6:09 PM
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What ALL did you do to the brake system so far?? We have to have a base line here to answer a ?? like this.

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post #3 of 9 (permalink) Old Jun 25th, 03, 6:11 PM Thread Starter
 
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Thus far I replaced the one rubber hose, I've changed out the fluid, and I've bled the system and I still have this problem. That is all that i know that has been done to the system.
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post #4 of 9 (permalink) Old Jun 25th, 03, 7:48 PM
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Did you replace that hose? Didn't bleed it enough, so you have air in the system, maybe? Is the pedal spongy, or does it just go all the way to the floor without any resistance at all? And how can a brake hose make the brake lock up? More questions than answers, but as already mentioned, you need to provide more information about what you have done to it. If I had to guess just by the info you have provided, you need to bleed the brakes. I'd do at least both front brakes, and if that makes it better, go ahead and bleed the rear ones too, air can travel in mysterious ways in a brake system.

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post #5 of 9 (permalink) Old Jun 25th, 03, 8:02 PM Thread Starter
 
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I replaced the hose. It was leaking where the hose meets the wheel cylinder. I have no idea how that made the wheel lock up, but thats what was doing it. Afterwards I bled the system, a few times, all of the wheels.

Like I said before what happens is the pedal doesn't engage until its about halfway down, then it will brake, but very very light. When its at the floor the car will still move. Frankly its very very unsafe. I have come to find that if i pump the brakes they'll work, but i have to pump them and I don't believe thats proper working condition.

My friend suggested replacing the master cylinder, any ideas?
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post #6 of 9 (permalink) Old Jun 25th, 03, 8:28 PM
 
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Sounds like you had got brake fluid on the brake shoes and that is why they were locking up. Also sounds you got air in the line somewhere, because you said it stops better when you pump the brakes. Try bleeding it starting with right rear, then the left rear, then the right front, then the left front and see what happens.

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post #7 of 9 (permalink) Old Jun 25th, 03, 9:15 PM
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A brake adjustment may be all that you need to get the brakes to function as they should and NO, the self adjusters rarely work as designed.

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post #8 of 9 (permalink) Old Jun 27th, 03, 6:12 PM
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Sounds like air, I would bleed it again and make two turns around all four to be safe. Brake fluid is cheap, so it's no big deal, just takes some time. Checking the self adjusters is also a good idea, look at the little "thingie" that engages the teeth on the adjuster. It needs to be able to pivot (could be stuck?), and it also needs to engage the teeth properly (you may have to bend it a bit if it's not engaging).

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post #9 of 9 (permalink) Old Jun 27th, 03, 6:24 PM
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Did you replace a hose, or all 3 rubber hoses?

I mean even though the outside looks ok, the inside can be really deterioated.

If you have all the air out, the fluid can collapse or balloon a bad hose.

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