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Old 06-26-2003, 02:38   #1 (permalink)
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Brake problems

Need some help, I've got an XY wagon i'm just about to get on the road. It's got new booster, master cylinder, brake lines, running XF disc brakes(front), drum brake rear with new wheel cylinders, but i've driven 4-wheel drums that have better stopping power. there is no air in the lines. Any ideas on what the problem may be?
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Old 06-26-2003, 02:43   #2 (permalink)
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Re: Brake problems

More info please. Is the booster working? How much pedal travel have you got?
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Old 06-26-2003, 02:49   #3 (permalink)
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Booster is working, but not much travel on the pedal, seems like brakes are either on or off.
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Old 06-26-2003, 02:54   #4 (permalink)
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Re: Brake problems

Front calipers are in working order, not seized? Does the master bore suit the front brakes and the crack valve (dual circuit?) suit the rear?
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Old 06-26-2003, 03:00   #5 (permalink)
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Front brakes arn't seized, all 4 are working, you can lock them up if you really jump on them, but they just don't stop quick enough. I'm running the same setup on my XY sedan only it has disc brake 9-inch, and that outbraked an AU on the brake tester.
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Old 06-26-2003, 03:09   #6 (permalink)
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Re: Brake problems

Of your total pedal travel, how much is booster generated? Give figures for each.
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Old 06-26-2003, 03:34   #7 (permalink)
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not sure on exact figures, but you can here the booster working for maybe 2 inches, then the brakes activate.
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Old 06-26-2003, 03:41   #8 (permalink)
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Re: Brake problems

I assume it is a dual circuit master? If you stand on pedal with engine off, how far does it go? If you retain pressure and start engine, how much further does it go? It is starting to sound like air in rear circuit.
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Old 06-26-2003, 04:01   #9 (permalink)
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ok, just went out and checked it. pedal moves about 2 inches, then another one when started. also noticed a sort of "whooshing" sound from the booster, hadn't noticed it before, because of exhuast leak that i just fixed.
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Old 06-26-2003, 04:19   #10 (permalink)
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Re: Brake problems

Normally, boosted travel will be more than unboosted travel. Could mean low vacuum or not very effective booster. Could also mean that there may be some air in the rear circuit. Can you feel the front and rear sections of the master working in the pedal travel? Remember, the front circuit only operates when the rear circuit has enough back pressure to push the secondary piston in. Air in rears will completely stuff up the operation of the fronts.
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