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| Poor Braking Performance; Low brake pressure | |
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| Tweet Topic Started: Jan 4 2011, 09:48 PM (2,995 Views) | |
| rcdraco | Jan 5 2011, 01:50 PM Post #16 |
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New Member
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In response to 944door: I personally bled each wheel until the fluid was clear. The shoes were put on about a week later. The only leak was a front brake hose, so those were replaced, fluid level has stayed high since. I think I'll try that though and replace the rear hoses as well, the car is nearly 16 years old they might as well be changed. |
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| 944door | Jan 5 2011, 03:23 PM Post #17 |
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So Id almost guarntee its the master cyl thats the culprit. If the rear brake hoses are clogged the pedal would be stiffer. It would only go to the floor if: 1: Air in the system (which you have ruled out) 2: A leak somewhere in a line, porpotioning valve, or hose (which has been ruled out) 3: A bad master cyl (yet to be ruled out) If fundage is short go to a salvage yard in search of a lower mileage Metro and snatch the master, they are simple enough to change. |
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| rcdraco | Jan 5 2011, 09:07 PM Post #18 |
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New Member
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So it can't be the brake booster itself though, right? I have a feeling that I might be better off changing both, the booster's surface is entirely corroded, and for the cost of both the job ends at like $100 plus a set of wrenches. (I work at an autoparts store, get a pretty good discount :P)
Edited by rcdraco, Jan 5 2011, 09:07 PM.
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| 944door | Jan 6 2011, 08:54 AM Post #19 |
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If it was the booster going bad your pedal would be hard as a rock. Sand paper and flat black spray paint do wonders as long as the booster is not rusted through. Also in some cases when the booster fails it causes a major vacuum leak. Edited by 944door, Jan 6 2011, 08:55 AM.
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| Bad Bent | Jan 6 2011, 03:58 PM Post #20 |
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Facetious Educated Donkey
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I just repaired the brakes on my friends '92 Nissan Pathfinder. His issue was the pedal going all the way to the floor. Virtually no resistance. I saw a brake fluid leak at the Master Cylinder (MC) and brake booster joint. His MC looks like our only larger . Click for pic.Apparently there is a very thin layer of gasket between the two that eroded. I disassembled it, cleaned the MC and used RTV on it when I put it back together. There may be a leak at the LF brake nine/hose. Good news is that my friend drove to work today and did not loose his brakes and wind up in a fiery crash. In the next few days we'll see if it is the brake line leaking also.
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| jonathan180iq | Jan 6 2011, 04:00 PM Post #21 |
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Not Really All That Smart
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Do you lose fluid over a short amount of time? Check for leaks in the system Just based on what you've already said, I'd say it's definitely ther master cylinder. Just grab one from a junker and replace the whole thing. |
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| rcdraco | Jan 6 2011, 11:07 PM Post #22 |
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I am confused though how it's not giving the tell tale symptom, it just seems like it's tired. Can it wear out just from the previous owner thinking brake fluid was a lifetime fluid.
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| 944door | Jan 10 2011, 08:28 AM Post #23 |
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Breaks plain and simple. With older cars like these parts can go bad at any given time. As for brake fluid being a "lifetime" fluid. I would say as long as the fluid isnt brownish its ok to roll. Id seriously doubt the the previous owner had anything to do with your master cyls demise.
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| Cobb | Jan 10 2011, 10:26 AM Post #24 |
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BANNED
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My fluid was browm like ice tea. It maybe lifetime like oil, but it can get dirty, absorbe water and break down. |
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| rcdraco | Jan 11 2011, 05:01 PM Post #25 |
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New Member
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Actually new info on this. It turns out I thought I was hitting the floor, the pedal is spongy at the top, then about half-way it turns very heavy, right about where it starts to grab respectfully. |
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| Jezza | Jan 11 2011, 05:20 PM Post #26 |
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Boost Junkie
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Still check out MC ... sounds fishy to me
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| rcdraco | Jan 12 2011, 06:46 PM Post #27 |
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New Member
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Like I said, for the price of both, and the work involved, I'd be safer off changing both. I plan to bury this car, I like it too much to sell it. |
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| JoeBob | Jan 12 2011, 11:43 PM Post #28 |
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Why you Mutt!
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I've had this problem with other cars. Replace the master cylinder. (Back in the day, we used to get rebuild kits for the master cylinder and rebuild them, but that was before the Miracle of China.) |
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| work car | Jan 13 2011, 04:24 AM Post #29 |
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obsessed!!
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x10 on the master cyl this IS your problem! change it and be done. |
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Breaks plain and simple. With older cars like these parts can go bad at any given time. As for brake fluid being a "lifetime" fluid. I would say as long as the fluid isnt brownish its ok to roll. Id seriously doubt the the previous owner had anything to do with your master cyls demise.
7:44 PM Jul 10