Re: Issues putting brake system together
[Re: lostdog]
#2502620
05/31/18 11:20 AM
05/31/18 11:20 AM
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Joined: Apr 2003
Posts: 348 Texas Hill Country
Centerline
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You say you're using a "stock style" master cylinder. Is it a disk/disk master or disk/drum?
Centerline 64 Dodge Polara 426 Street Wedge - For when I want to go fast 99 Corvette Z-06 - For when I want to turn corners
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Re: Issues putting brake system together
[Re: Centerline]
#2502635
05/31/18 11:58 AM
05/31/18 11:58 AM
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Joined: Aug 2011
Posts: 363 mississippi
lostdog
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You say you're using a "stock style" master cylinder. Is it a disk/disk master or disk/drum? I got the MC/booster combo from O'reilly's and I ordered it for disc/drum.
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Re: Issues putting brake system together
[Re: Greentween]
#2502637
05/31/18 11:59 AM
05/31/18 11:59 AM
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lostdog
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Drawing above was pretty clear, but I attached picture of the linkage. Maybe it will help you find it somewhere.
Yep - looks like that's what I am missing !
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Re: Issues putting brake system together
[Re: lostdog]
#2503116
06/01/18 12:07 PM
06/01/18 12:07 PM
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You say you're using a "stock style" master cylinder. Is it a disk/disk master or disk/drum? I got the MC/booster combo from O'reilly's and I ordered it for disc/drum. That's your problem. You will never get the brakes working properly if you're using a master cylinder designed for rear drum brakes when you're actually using rear disks. You NEED a Disk/Disk master cylinder. That will solve your problem.
Centerline 64 Dodge Polara 426 Street Wedge - For when I want to go fast 99 Corvette Z-06 - For when I want to turn corners
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Re: Issues putting brake system together
[Re: Centerline]
#2503327
06/01/18 08:40 PM
06/01/18 08:40 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
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You say you're using a "stock style" master cylinder. Is it a disk/disk master or disk/drum? I got the MC/booster combo from O'reilly's and I ordered it for disc/drum. That's your problem. You will never get the brakes working properly if you're using a master cylinder designed for rear drum brakes when you're actually using rear disks. You NEED a Disk/Disk master cylinder. That will solve your problem. Nope The only difference is reservoir capacity, just check it when doing an oil change, top off as needed and the residual pressure valve in the rear brake (front port) outlet, which he's already been told to remove.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Issues putting brake system together
[Re: Supercuda]
#2503667
06/02/18 07:46 PM
06/02/18 07:46 PM
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You say you're using a "stock style" master cylinder. Is it a disk/disk master or disk/drum? I got the MC/booster combo from O'reilly's and I ordered it for disc/drum. That's your problem. You will never get the brakes working properly if you're using a master cylinder designed for rear drum brakes when you're actually using rear disks. You NEED a Disk/Disk master cylinder. That will solve your problem. Nope The only difference is reservoir capacity, just check it when doing an oil change, top off as needed and the residual pressure valve in the rear brake (front port) outlet, which he's already been told to remove. Even removing the built in residual valve won't make it safe. There is no way I would use a disk/drum master cylinder on a disk/disk system. As the pads wear the pistons have to make up the difference and need larger amounts of fluid. That's why the reservoirs are larger on the disk side. It is ALWAYS best to use a master cylinder designed for the type system you're using. Jury rigging brakes is never a good idea.
Last edited by Centerline; 06/02/18 07:46 PM.
Centerline 64 Dodge Polara 426 Street Wedge - For when I want to go fast 99 Corvette Z-06 - For when I want to turn corners
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Re: Issues putting brake system together
[Re: lostdog]
#2503679
06/02/18 08:39 PM
06/02/18 08:39 PM
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then suggest one that will fit his booster rather than pontificate.
Other than the reservoir capacity and rpv there is no difference and if you can't be bothered to check fluids at each oil change then maybe you should be using Uber.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Issues putting brake system together
[Re: lostdog]
#2503721
06/02/18 11:13 PM
06/02/18 11:13 PM
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Joined: Dec 2014
Posts: 6,243 ohio
ruderunner
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I agree with supercuda, just top offfluid as needed and ditch the rpv.
You can also use a disc disc master for drum drum car.
This doesn't take into account bore sizes but that's a different discussion.
Angry white pureblood male
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Re: Issues putting brake system together
[Re: lostdog]
#2503906
06/03/18 01:59 PM
06/03/18 01:59 PM
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Joined: Apr 2003
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A quick search turned up disk/disk masters for '73 Barracuda at Summit, and I'm sure a quick trip to Napa or AutoZone would turn up more. My point is.. you can use a disk/drum in this situation but when an engineered disk/disk version is available why jury rig the system. Makes no sense to me but then apparently, I'm no expert since you guys seem to think barbed wire and bubble gum is a better idea.
Centerline 64 Dodge Polara 426 Street Wedge - For when I want to go fast 99 Corvette Z-06 - For when I want to turn corners
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Re: Issues putting brake system together
[Re: Centerline]
#2503908
06/03/18 02:03 PM
06/03/18 02:03 PM
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A quick search turned up disk/disk masters for '73 Barracuda at Summit, and I'm sure a quick trip to Napa or AutoZone would turn up more. My point is.. you can use a disk/drum in this situation but when an engineered disk/disk version is available why jury rig the system. Makes no sense to me but then apparently, I'm no expert since you guys seem to think barbed wire and bubble gum is a better idea. that would be a hell of a trick since a 73 Barracuda never had 4 wheel discs from the factory. Care to link to it, because whatever you think it is, it's not stock and it's will be a jury rig. Surprised you don't seem to have heartburn with the OP's setup since it is all a jury rig.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Issues putting brake system together
[Re: lostdog]
#2503914
06/03/18 02:13 PM
06/03/18 02:13 PM
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The OP didn't choose the best conversion kit for sure and that is the main problem. And Summit's parts aside, there are other Mopar disk/disk master cylinders that will fit and work on his power brake booster. They may not be listed for a Barracuda, but given he's using GM style rear calipers, going with a non Barracuda Mopar master cylinder seems trivial.
Centerline 64 Dodge Polara 426 Street Wedge - For when I want to go fast 99 Corvette Z-06 - For when I want to turn corners
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Re: Issues putting brake system together
[Re: lostdog]
#2503924
06/03/18 02:54 PM
06/03/18 02:54 PM
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Mopar disk/disk master cylinders that will fit and work on his power brake booster Provide a link, the OP has an issue, you say there is a correct fix for it, but will not help out with a link. Why?
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Issues putting brake system together
[Re: lostdog]
#2504040
06/03/18 08:14 PM
06/03/18 08:14 PM
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So what you are saying is there are no Mopar master cylinders for disk/disk that will bolt up to a Mopar power brake booster? Yea, right.
I'm done arguing with someone who is bound to give redneck advice. Have a nice day.
Centerline 64 Dodge Polara 426 Street Wedge - For when I want to go fast 99 Corvette Z-06 - For when I want to turn corners
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Re: Issues putting brake system together
[Re: Moparteacher]
#2504143
06/04/18 12:22 AM
06/04/18 12:22 AM
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Joined: Dec 2004
Posts: 10,607 Rittman Ohio
fourgearsavoy
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I used a Strange 15/16" master cylinder with the line for the rears going straight back to the T-fitting and the line for the front brakes going straight to the line lock with no blocks or valves in the system. It stops straight and steady from over 120 with no lock up or pedal issues. I used one of Doctordiff's adapters and pedal pushrod. I am still using the original manual drum brake pedal assy. I was going to use the Wilwood adjustable block but my car stops great now so why waste my money Gus
64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60
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Re: Issues putting brake system together
[Re: Supercuda]
#2504433
06/04/18 05:02 PM
06/04/18 05:02 PM
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Joined: Dec 2013
Posts: 198 Stinnett, Tx
rumblebee4232
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Mopar disk/disk master cylinders that will fit and work on his power brake booster Provide a link, the OP has an issue, you say there is a correct fix for it, but will not help out with a link. Why? In 74 IIRC the Chrysler imperial used rear disc brakes which should have been a bolt on including the master cylinder.. Probably take someone willing to look through the books rather than the normal parts jockey that needs to know if you have A/C to find you a brake light bulb..
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Re: Issues putting brake system together
[Re: Centerline]
#2504748
06/05/18 11:39 AM
06/05/18 11:39 AM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
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So what you are saying is there are no Mopar master cylinders for disk/disk that will bolt up to a Mopar power brake booster? Yea, right.
I'm done arguing with someone who is bound to give redneck advice. Have a nice day. No, I believe I was saying you are FOS as evidenced by your repeated inability to provide the link for the part you say will do the job. That is because it does not exist. The is no "disk/disk" Mopar master cylinder that will just bolt up to his existing booster.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Issues putting brake system together
[Re: lostdog]
#2505440
06/07/18 12:27 AM
06/07/18 12:27 AM
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I dug thru the 2 FSM on the Imp 4 wheel disc setup and really couldn't find anything specific about the MC, other than it's unobtanium.
But it sure had a lot about the Sure Stop setup (ABS)
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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