Re: Modern brakes, part two.
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Home away from home
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Howard,
Glad to hear about renewed progress on your MPB conversion and the revised pedal arrangement. But, some pictures would explain 1000 words worth. As to whether the braking force is enough with no vacuum assist, the obvious answer (I'm sure you thought of it) is to test it that way. As far as over-sensitivity is concerned, do you have front OEM drum brakes or discs converted? On my Patrician with a similar setup with disc brakes, the pedal is not overly sensitive with vacuum connected. Although not a direct comparison, earlier in my Pat's life, I do remember an overhauled BTV with OEM drums WAS very sensitive and I didn't like it. Craig
Posted on: 2012/9/3 11:21
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Nuke them from orbit, it's the only way to be sure! Ellen Ripley "Aliens"
Time flies like an arrow. Frui |
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Re: Modern brakes, part two.
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Home away from home
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I would prefer the sensitivity as u describe. Would also like to see pics.
Now that u have it running does this mean that u successfuly mounted the MC verticle as u had once indicated a few months ago????
Posted on: 2012/9/3 12:18
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VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=7245 |
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Re: Modern brakes, part two.
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Home away from home
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Are u using a prop valve and/or a residual pressure valve???
Posted on: 2012/9/3 12:28
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VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=7245 |
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Re: Modern brakes, part two.
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Forum Ambassador
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Here are a few inprogress photos. Everything fits inside the vent opening and rod goes down behind insulator panel to booster. Did have to make a larger opening in the original toe plate so rod passes near steering column. Vent grill was turned upside down to take advantage of the large space. Made bellcrank pieces so it was open & air can still flow thru for my AC. Once everything final, will add some kind of bellows to keep air from engine cmpt getting into vent thru that space.
The master is at an angle but not straight up and down. Did the heat shield but think I will also add the ceramic insulator sheet to it and also add some insulation to protect the hoses. Not using a prop valve. Did leave the one residual valve to rear because it was used to join two sections of new line & would have had to come up with something else. MPB says they're not needed with remote fill masters where reservoir is high so didn't reinstall the front one.
Posted on: 2012/9/3 12:50
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Howard
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Re: Modern brakes, part two.
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Home away from home
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Ok. It took a while but i think i see how u did it. Slick set up. U deserve eng'eer of year award for it.
However on the RESIDUAL pressure valve: Quote: "Did leave the one residual valve to rear ... MPB says they're not needed with remote fill masters where reservoir is high so didn't reinstall the front one." Better check some other sources about the function of the residual pressure valve. My understanding is that the Resisual pressure valve is for DRUM brakes only (especialy front). It keeps the shoe springs from retracting the shoes completely when foot is released from pedal. Has nothing to do with reservoirs. AFIK all four wheel DRUM brake systems of any manufacturers used residual pressure valvels built into the master cylinder.
Posted on: 2012/9/3 13:11
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VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=7245 |
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Re: Modern brakes, part two.
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Forum Ambassador
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I'll keep an eye on it and not a problem to reinstall but as you say, the purpose is to prevent fluid from draining back if the master is lower than wheel cylinder. According to MPB as long as the reservoir is high, the gravity pressure of the fluid has the same effect.
Posted on: 2012/9/3 13:25
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Howard
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Re: Modern brakes, part two.
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Home away from home
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According to Motors Manual 1963, Hydraulic Brake section p 165:
" The purpose of this (residual 8 to 12 pounds) pressure is to keep the wheel cylinder cups from leaking and to reduce possibility of air leaking into the system". I suppose it's the slight pressure that keeps the wheel cylinder rubber cups tightly expanded against the bore of the wheel cylinder.
Posted on: 2012/9/3 14:31
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VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=7245 |
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Re: Modern brakes, part two.
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Home away from home
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!963 Motors also indicates a DUAL master cylinder used on 62 Cad and Rambler. Has 2 residual pressue check valves.
Then shows a 'typical' master cylinder with valve. BAsed on my limited experience nearly all cars of GM, F and C production were hanging pedal and hi firewall mounted Master cylinders 1958 and later. Apparently all (or greatest percentage of production) had residual check valves AS WELL AS 4 wheel drum well into th e late 60's. The earliest evidence i can find of disk brakes is 1968 as an OPTION. That is only checking among GM,F and C.
Posted on: 2012/9/3 14:39
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VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=7245 |
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Re: Modern brakes, part two.
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Home away from home
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I think 1965 AMC products had power disc brake as an option/standard. My Rambler marlin supposedly had them standard. Early fifties Chrysler Imperial had discs as an option too. I wanna say Crosley had discs as well but not sure.
Posted on: 2012/9/4 14:51
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"Do you ever think about the things you do think about?"
Inherit the Wind |
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