dragging disks
#668143
04/12/10 12:59 PM
04/12/10 12:59 PM
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Joined: Jan 2003
Posts: 3,719 Space Station #5
471Magnum
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The manual front disc brakes on my Challenger seem to be dragging. I believe these are a Master Power conversion kit.
Had the front end up off the ground, and while I could turn the wheels, they won’t spin. There is definitely a lot of drag.
Pedal is coming up all the way, and I even shortened the rod a bit to see if it needed to come up further (it didn't).
What might be causing this issue? And how do I fix it?
-Jim
I can fix it... my old man is a television repairman. He's got the ultimate set of tools... I can fix it.
Currently Mopar-less
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Re: dragging disks
[Re: 471Magnum]
#668145
04/12/10 01:07 PM
04/12/10 01:07 PM
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Joined: Nov 2004
Posts: 9,312 SoCal
68HemiB
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SoCal
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First, establish if it is residual brake line pressure or something mechanical with the calipers/sliders by cracking open the bleeder.
If cracking the bleeder relieves the drag, pursue kinked or failed line, stuck prop valve, messed up MC, or maladjusted MC rod.
If it doesn't, pursue/clean/lube the workings of how the calipers slide.
Down to just a blue car now.
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Re: dragging disks
[Re: 68HemiB]
#668146
04/12/10 01:18 PM
04/12/10 01:18 PM
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Joined: Jan 2003
Posts: 3,719 Space Station #5
471Magnum
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I'm getting the same drag on both sides, which leads me to believe the problem is well upstream.
Shouldn't be a residual valve on the front, should there?
There is nothing restricting upward travel of the pedal. That's the first thing I checked by removing the brake lamp switch and shortening the rod.
-Jim
I can fix it... my old man is a television repairman. He's got the ultimate set of tools... I can fix it.
Currently Mopar-less
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Re: dragging disks
[Re: 471Magnum]
#668147
04/12/10 01:28 PM
04/12/10 01:28 PM
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Joined: Oct 2007
Posts: 3,903 Oregon
hooziewhatsit
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Oregon
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to check the residual valve, take the line off the master cylinder and look in the port. There'll be a hole in the middle tube seat. Stick a toothpick in the hole and see if you can feel something 'springy'.
If you can, that's the pressure valve, so you'll need to use an easy out to remove the tube seat to get access to the pressure valve.
Or, it could be like my master cylinder when I went from drum to disc, and just didn't have the RPV.
If you ever find yourself in a fair fight, your tactics suck.
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Re: dragging disks
[Re: stumpy]
#668149
04/12/10 02:54 PM
04/12/10 02:54 PM
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Joined: Jan 2003
Posts: 25,200 Upper Midwest
MoparforLife
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Posts: 25,200
Upper Midwest
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Quote:
Some drag is normal. They won't spin free like drums do.
There is always some drag to the isc brakes. Keep sthe rotors clean and free of road debrie.
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Re: dragging disks
[Re: stumpy]
#668150
04/12/10 02:56 PM
04/12/10 02:56 PM
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Joined: Jan 2003
Posts: 3,719 Space Station #5
471Magnum
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I'm familiar with the normal drag. This is more drag than I've felt on any other disc brake car.
I can usually spin the wheel a little. Not so in this case. It stops immediately.
-Jim
I can fix it... my old man is a television repairman. He's got the ultimate set of tools... I can fix it.
Currently Mopar-less
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Re: dragging disks
[Re: 471Magnum]
#668151
04/12/10 03:00 PM
04/12/10 03:00 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Yes it's a judgement call as some drag more than others and I had one (oe) that seemed too tight and a rebuilt caliper took care of it. I'd crack the line at the caliper to see (in seconds) if it is a psi issue or a mechanical one and most likely could crack it a bit and not have to rebleed
live every 24 hour block of time like it's your last day on earth
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Re: dragging disks
[Re: RapidRobert]
#668152
04/12/10 03:04 PM
04/12/10 03:04 PM
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Joined: Jan 2003
Posts: 3,719 Space Station #5
471Magnum
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Yep. Tonight I'll check to see if there is pressure on it.
-Jim
I can fix it... my old man is a television repairman. He's got the ultimate set of tools... I can fix it.
Currently Mopar-less
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Re: dragging disks
[Re: 68HemiB]
#668154
04/12/10 04:11 PM
04/12/10 04:11 PM
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Joined: Sep 2005
Posts: 6,516 Santa Cruz, California
Lefty
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Quote:
First, establish if it is residual brake line pressure or something mechanical with the calipers/sliders by cracking open the bleeder.
If cracking the bleeder relieves the drag, pursue kinked or failed line, stuck prop valve, messed up MC, or maladjusted MC rod.
If it doesn't, pursue/clean/lube the workings of how the calipers slide.
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Re: dragging disks
[Re: stumpy]
#668155
04/12/10 04:14 PM
04/12/10 04:14 PM
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Joined: Aug 2007
Posts: 6,096 Valencia, España
NachoRT74
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Posts: 6,096
Valencia, España
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Last time my car did that, it was the brake fluid dist block ( prop valve )
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: dragging disks
[Re: dave571]
#668158
04/13/10 07:54 AM
04/13/10 07:54 AM
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Joined: Jan 2003
Posts: 3,719 Space Station #5
471Magnum
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Rechecked it last night. RH side felt pretty normal. LH side definitely has more drag. Don't feel it going down the road though.
Need to pull the wheel for a closer look.
-Jim
I can fix it... my old man is a television repairman. He's got the ultimate set of tools... I can fix it.
Currently Mopar-less
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