A Body disc brake swap - proportioning valve.
#1412235
03/31/13 03:46 PM
03/31/13 03:46 PM
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Joined: Mar 2003
Posts: 4,930 Tri-Cities, Washington
VITC_GTX
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Tri-Cities, Washington
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1969 Barracuda; I put '73 A body disc brake spindle/calipers on. The rear brakes don't seem to work unless I hit the pedal very hard. Also, after they are activated they don't release very well (drag a lot).
The car still has the original proportioning valve, is it required to change that out when going from older drums to newer discs? If so, is there a drop in valve that I can buy that won't require me to redo the lines (bending lines/new fittings)?
Last edited by VITC_GTX; 03/31/13 03:47 PM.
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Re: A Body disc brake swap - proportioning valve.
[Re: VITC_GTX]
#1412237
03/31/13 04:45 PM
03/31/13 04:45 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Circle Track
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Posts: 36,041
Lincoln Nebraska
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I put 74 A discs on my 65 dart & kept the OE drum splitter & NO issues. 10" rear drums/alum dual bowl M/C. bowl next to firewall to front discs/forward bowl to rear drums. Likely an issue with the OE prop valve. I'd open it up & see what's stuck or I wouldn't be afraid to gut it & convert it to an open splitter & avoid having to rebend lines.
live every 24 hour block of time like it's your last day on earth
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Re: A Body disc brake swap - proportioning valve.
[Re: VITC_GTX]
#1412243
03/31/13 10:53 PM
03/31/13 10:53 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Circle Track
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Lincoln Nebraska
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Yes if it was originally 4 wheel drums it would have originally have had a distribution block AKA as a splitter. First thing I'd do is look up under there & see what you have since front discs have already been swapped on by a PO. You have a blockage somewhere.
Last edited by RapidRobert; 03/31/13 10:57 PM.
live every 24 hour block of time like it's your last day on earth
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Re: A Body disc brake swap - proportioning valve.
[Re: VITC_GTX]
#1412244
03/31/13 10:53 PM
03/31/13 10:53 PM
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Joined: Nov 2005
Posts: 15,119 85086
moparpollack
Lil Herman
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Lil Herman
Joined: Nov 2005
Posts: 15,119
85086
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I say the calipers pistons are stiff from sitting.
What master cylinder are you using? How old are the lines? I had a car where the lines looked new but the insides were gunked up from old fluid.
56 Plaza 63 D100 step side 67 Coronet, 68 Roadrunner, 69 Super Bees, 69 Coronet 500 convertible, 70 Roadrunner Post, 79 D150 360, and a severe case of Mopar a,d,d
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Re: A Body disc brake swap - proportioning valve.
[Re: RapidRobert]
#1412245
03/31/13 11:01 PM
03/31/13 11:01 PM
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Joined: Nov 2005
Posts: 15,119 85086
moparpollack
Lil Herman
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Lil Herman
Joined: Nov 2005
Posts: 15,119
85086
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Quote:
Yes if it was originally 4 wheel drums it would have originally have had a distribution block AKA as a splitter. First thing I'd do is look up under there & see what you have since front discs have already been swapped on by a PO. You have a blockage somewhere.
56 Plaza 63 D100 step side 67 Coronet, 68 Roadrunner, 69 Super Bees, 69 Coronet 500 convertible, 70 Roadrunner Post, 79 D150 360, and a severe case of Mopar a,d,d
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Re: A Body disc brake swap - proportioning valve.
[Re: VITC_GTX]
#1412247
03/31/13 11:29 PM
03/31/13 11:29 PM
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Joined: Jan 2003
Posts: 6,531 Jacksonville, FL
Chris2581
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Jacksonville, FL
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FWIW... I put Wilwood HD brakes on the front of my 71 Demon and all I did was change the front brakes over and install one of Ehrenberg's Mopar master cylinders.My Dana already had 10" drums from a B-body on the rear when the car had the OEM 10 front drums and my brakes work great.
Nautilus Racing- We use Superformance gaskets and Turbo Action converters/products.
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Re: A Body disc brake swap - proportioning valve.
[Re: RapidRobert]
#1412248
03/31/13 11:34 PM
03/31/13 11:34 PM
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Joined: Mar 2003
Posts: 4,930 Tri-Cities, Washington
VITC_GTX
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OP
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Tri-Cities, Washington
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Quote:
Yes if it was originally 4 wheel drums it would have originally have had a distribution block AKA as a splitter. First thing I'd do is look up under there & see what you have since front discs have already been swapped on by a PO. You have a blockage somewhere.
How can I tell if I have a splitter or a proportioning valve?
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Re: A Body disc brake swap - proportioning valve.
[Re: VITC_GTX]
#1412250
04/01/13 12:48 AM
04/01/13 12:48 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Circle Track
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Posts: 36,041
Lincoln Nebraska
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Quote:
Is the splitter simply a block with no valves, just a fancy tee with one inlet and three outlets?
Yes, a basic T block & a prop is larger/more complicated as it contains valving. I wonder if the rear flex hose has collapsed internally. EDIT I'd jack up all 4 corners & see how much braking you do have. Something ain't right here in the symptoms
Last edited by RapidRobert; 04/01/13 01:05 AM.
live every 24 hour block of time like it's your last day on earth
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Re: A Body disc brake swap - proportioning valve.
[Re: RapidRobert]
#1412251
04/01/13 02:15 AM
04/01/13 02:15 AM
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Joined: Mar 2003
Posts: 4,930 Tri-Cities, Washington
VITC_GTX
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OP
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Joined: Mar 2003
Posts: 4,930
Tri-Cities, Washington
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Quote:
Quote:
Is the splitter simply a block with no valves, just a fancy tee with one inlet and three outlets?
Yes, a basic T block & a prop is larger/more complicated as it contains valving. I wonder if the rear flex hose has collapsed internally. EDIT I'd jack up all 4 corners & see how much braking you do have. Something ain't right here in the symptoms
I did remove the rear flex hose and blew compressed air through it. It seemed to have no restrictions at all. I'm wondering if my splitter/proportioning valve is where the blockage is
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