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Old 02-27-2006, 01:13 PM
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Disc Brakes hang up

We converted my dads 34 dodge to disc brakes in the front and rear and he thinks the brakes are hanging up and slowing down his et. So we went out and pushed it and it moved fine. until we hit the brakes then it was like the front wheels were hard to roll. So what would cause this a bad master cylinder or what?????

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Old 02-27-2006, 01:46 PM
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What was the doner for the discs? New, or used?

I'd start with the float pins. And/or the caliper mount slides.
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Old 02-27-2006, 01:48 PM
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new willwood brake kits that had to be kinda modified.
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Old 02-27-2006, 02:04 PM
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Does your system have a residual valve in the system and also are your flex lines new?
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Old 02-27-2006, 02:17 PM
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i do not have a residual valve in the front i took it out and my flex lines are like 3 years old, new when we put it together.
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Old 02-27-2006, 02:21 PM
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What mods did you do to the willwood?
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Old 02-27-2006, 02:40 PM
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the did not have a backing plate for a 34 drop axle so we had to make are own backing plates.
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Old 02-27-2006, 02:45 PM
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I notice you converted both brakes to disk, just trying to think of things are you sure it is the fronts hanging up.
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Old 02-27-2006, 03:21 PM
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no the seamed to skid but they are smaller than the back so it could be the back.
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Old 02-27-2006, 04:38 PM
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I was thinking in terms of residual valve that was originally for the back, if still there might be hanging the backs up. Depending on what master cylinder you have the valve might be in the master. Later models uaually have them in the combination valve. Do you have one of those? I am sure if you check everything you will find it. Just takes a bit of time to figure out.
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Old 02-27-2006, 06:24 PM
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The master cylinder is out of a 95 nissan truck and that it had a option of disc or drum up front and drum in back so i think it might be the problem. and what is a combination valve??????
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Old 02-27-2006, 08:08 PM
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combination valve usually works as required residual valve, the proportioning valve and usually the system isolator for brake failure. It also usually works the parking brake light. I am not up how the nissan system works.
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Old 02-27-2006, 08:40 PM
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well i just pulled the master cylinder off and cleaned it out and i can blow back to the reservoir with no problem on the front and rear brakes. Does that mean that i don't have any residual valves in the master cylinder???? On disc brakes far will the wheel rotate before coming to a stop??? cause right now with no master cylinder it will make about a half a rotation before stopping.
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Old 02-27-2006, 09:00 PM
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If with no master you can trun 1\2 turn and then the disk stops the items to look at would be if there is no valving from the master down
1 the hard lines could have a restriction
2 the flex lines could have a collaped condition
3 the calipers could be hanging up

are the calipers new?
could you jack the car and check if all wheels react the same?
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Old 02-27-2006, 10:11 PM
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I jacked it up and the passanger front brake was not moving at all. so i look pulled the wheel off and found that one brake pad was tuching and the other had clearance. so i pulled the, i gess they call them "flot pins" out and they did not move at all so i beat them out and greassed them up with normal greass and now the wheel turn like 10 revloutin befor stoping. so is it normal for the flot pins to seaze like that???? if not is there special greass to put on them. and the front calipers are like 3 years old and were brand new but the master cyclener was not.
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