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| proportioning valve question https://slantsix.org/forum/viewtopic.php?t=33916 |
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| Author: | Zipper [ Sat Feb 21, 2009 10:56 pm ] |
| Post subject: | proportioning valve question |
I have a Disk/Drum convention on my 68 Dart. Theres no proportioning valve, and it pulls to the right on braking. Its bad enough that we just replaced the pads and rotor on the right (originally thought it was bearings, turns out the squeaking was the brakes, and the over ground rotor) Its manual brakes, with late 70's front disk, and stock 68 rear drums. Will the proportioning valve help eliminate the pull, or do I need to look somewhere else to solve this? I know Its a good thing (along with the residual pressure valve as per this thread) but I'm getting a conflicting message between it effecting L/R and F/B distribution |
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| Author: | emsvitil [ Sat Feb 21, 2009 11:12 pm ] |
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The valve won't help with the pull........ Are the front brakes or rear brakes causing the pull? |
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| Author: | Zipper [ Sat Feb 21, 2009 11:56 pm ] |
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Its the front. One side still has nice meat on the pads, the other, grinding the rotor. (was not happy when I found that. Had misidentified the squeak sound while moving, no sound on stopping) Its been under 3K sence the front end was redone |
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| Author: | dakight [ Sun Feb 22, 2009 4:43 am ] |
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It sounds like a sticking caliper causing uneven pressure (and uneven wear) side to side. |
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| Author: | emsvitil [ Sun Feb 22, 2009 4:53 am ] |
| Post subject: | |
Quote: It sounds like a sticking caliper causing uneven pressure (and uneven wear) side to side.
A clogged up brake hose can do that too...
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| Author: | SlantSixDan [ Sun Feb 22, 2009 8:00 am ] |
| Post subject: | |
Whatever the fix winds up being, you will want to install an appropriate proportioning valve ASAP — don't wait until you have to stand on the brakes to avoid a crash and suddenly find yourself facing a direction other than the one you previously selected with the steering wheel. |
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| Author: | Zipper [ Sun Feb 22, 2009 3:09 pm ] |
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Ah, the fun of being the fourth owner, second after a lowrider. ALot of mods are done half way, say like the brakes. So, sounds like I'm bleading the fronts to see if something clogged or has air. As for the proportioning valve, where those on later models, or is it after market. Just thinking out loud, I would think they have them on later model cars with the disk front and drum rear. |
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| Author: | dakight [ Sun Feb 22, 2009 3:31 pm ] |
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You can get the proportion valve or "combination valve" from a disk brake equipped car or you can get an adjustable aftermarket valve for arounf $40.00 as I recall. |
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| Author: | slantfin [ Sun Feb 22, 2009 4:31 pm ] |
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My car book says a combination valve is 3-in-1, a pressure differential valve that sets off a warning light, a metering valve to compensate for drum springs, and a proportioning valve. That sounds like a good idea. |
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| Author: | slantfin [ Wed Feb 25, 2009 2:48 pm ] |
| Post subject: | |
Being happily self-underemployed, I've been looking into the valve question. I'm now at the point where I know more about brake valves than the tech at Inline Tube (which isn't much). One source who seemed knowledgeable was the brakeman: http://www.thebrakeman.com/valvetechii The link should take you to page 2 where he discusses metering valves. Without them, he says, in stops from less than 30 mph, the front brakes are doing all the work, since the resistance of the rear springs hasn't been overcome= fast pad wear. I haven't found a good source for a combination valve yet, but would like to for economy. Otherwise, metering and prop. valves separately seems like the way to go. In defense of Inline Tube, I just got some ss caliper lines from them that look awesome. |
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| Author: | SlantSixDan [ Wed Feb 25, 2009 3:19 pm ] |
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Quote: My car book says a combination valve is 3-in-1, a pressure differential valve that sets off a warning light, a metering valve to compensate for drum springs, and a proportioning valve.
That is not necessarily the case. A combination valve can contain a pressure differential valve for the warning light, a hold-off valve to compensate for drum springs, and a proportioning valve, but not all of them do. The original A-body disc/drum combination valves contain a pressure-differential valve for the warning light and a proportioning valve, but no hold-off valve. The B-, C-, and D-body combination valves (and probably the F-, M-, J-body valves) do contain the hold-off valve.
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| Author: | SlantSixDan [ Wed Feb 25, 2009 3:21 pm ] |
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Quote: I haven't found a good source for a combination valve yet
Both Inline Tube and Classic Tube have them.
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| Author: | bwhitejr [ Thu Feb 26, 2009 3:53 am ] |
| Post subject: | Combination Valve |
You can get a Combo Valve at Master Power Brakes too. http://www.mpbrakes.com/products/produc ... uct_id=614 bwhitejr |
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| Author: | Volare4life [ Sat Feb 28, 2009 9:35 am ] |
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not meaning to jack the thread but pretty sure i didn't see it, but what happens when you switch to to rear disc * its a f-body so she already has front disc*. I was thinking of just using the prop block from the jeep that I am taking the disc setup from, would that be the wasy to go, or will I still need a adjustable prop valve and residual valve(s) ? -Mike |
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| Author: | Joshie225 [ Sat Feb 28, 2009 12:48 pm ] |
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You'll still want a proportioning valve, but the hold-off valve that delays front brake application can go. |
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