Re: Master Cylinder - Manual Front Disk
[Re: Sxrxrnr]
#2242389
01/27/17 06:16 PM
01/27/17 06:16 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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at your parts house look in the rear piston "thimble" & for a manual brake app it needs to have the circular recess about halfway down for the neoprene nub on the end of the manual brake pushrod to lock into. A PB app does not need the recess but is fine with it, not so with manual brakes, must have. then as you are doing, get the right bore.
live every 24 hour block of time like it's your last day on earth
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Re: Master Cylinder - Manual Front Disk
[Re: dd340]
#2242398
01/27/17 06:31 PM
01/27/17 06:31 PM
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Joined: May 2005
Posts: 4,748 Florida
BDW
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master
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Florida
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Re: Master Cylinder - Manual Front Disk
[Re: 71charger]
#2242779
01/28/17 01:59 PM
01/28/17 01:59 PM
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Joined: Jan 2003
Posts: 727 Ottawa, ontario
dd340
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 727
Ottawa, ontario
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Dr. Diff recommended the Raybestos MC36406 to me back on '08 and I've been very happy with it. I was looking at that one as well but it lists for power brakes but I want manual. That was what prompted my question. Are you using this mc on a manual brake car?
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Re: Master Cylinder - Manual Front Disk
[Re: RapidRobert]
#2242829
01/28/17 03:07 PM
01/28/17 03:07 PM
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Joined: Jan 2003
Posts: 727 Ottawa, ontario
dd340
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OP
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Ottawa, ontario
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at your parts house look in the rear piston "thimble" & for a manual brake app it needs to have the circular recess about halfway down for the neoprene nub on the end of the manual brake pushrod to lock into. A PB app does not need the recess but is fine with it, not so with manual brakes, must have. then as you are doing, get the right bore. I would be interested to know if the manufacturers make all their mc compatible with manual brakes if they can also be used on power brake cars but not vice versa.
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Re: Master Cylinder - Manual Front Disk
[Re: dd340]
#2242912
01/28/17 05:28 PM
01/28/17 05:28 PM
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Joined: Jan 2003
Posts: 21,080 Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,080
Niles , Ohio
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I run all 70 C body disc masters.Mine has been on my 65 for 20 years.used it on my kids 62 300 with power and for drums.Mine is manual and disc.have done a few others and all worked good.Rocky
Chrysler Firepower
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Re: Master Cylinder - Manual Front Disk
[Re: dd340]
#2242946
01/28/17 06:33 PM
01/28/17 06:33 PM
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Joined: Jan 2003
Posts: 25,903 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
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Posts: 25,903
Rio Linda, CA
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I use the 1 1/32" MC on my 3600 pound manual front disc car, I tried the 15/16" and it gave a low/soft pedal with no noticeable improvement in braking.
The INTERNET, the MISinformation superhighway
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Re: Master Cylinder - Manual Front Disk
[Re: dd340]
#2243065
01/28/17 10:19 PM
01/28/17 10:19 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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I would be interested to know if the manufacturers make all their mc compatible with manual brakes if they can also be used on power brake cars but not vice versa. they are all about max profit/minimum inventory (which makes sense) like a carb kit will contain extras for several variations. You would think they would make all rear pistons (but of different diameters for all the apps) with the groove to be used for manual or power apps. there has to be a reason why both types are mfr'd.
live every 24 hour block of time like it's your last day on earth
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Re: Master Cylinder - Manual Front Disk
[Re: dd340]
#2243171
01/29/17 12:54 AM
01/29/17 12:54 AM
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Joined: Feb 2010
Posts: 1,645 Phila. Pa.
Mattax
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top fuel
Joined: Feb 2010
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Phila. Pa.
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Does it make a difference? Manual compared to Power. It depends on the set up. Some power setups will change the mechanical linkage ratios. But in your case, its not too useful bit of information. Your decision should be based on: - Whether the master cylinder will retain your pushrod.
- Whether the master cylinder has a large rear resevoir for the disks.(Some are just drum brake masters with the residual valve removed from the rear outlet).
- Total area of pistons that need to be displaced. Less or smaller pistons will need less volume from the master cylinder to move the same distance.
Cnxt's rules of thumb are good. A smaller master cylinder diameter will require less force to develop the same pressure. The downside is it will have to move further to displace the fluid needed to move the caliper's pistons. Assuming your conversion is to a stock type caliper - here's my work in progress crib sheet for the A-bodies. Feel free to add, question or correct (especially if you have a documented source). years___Application_____________p/n_______Bore1966... Fixed Ft calipers, Manual................1" 1966... Fixed Ft calipers, Power..................1" 67-70.. Fixed Ft calipers...........2808600.....1" 71-72.. Fixed Ft calipers...........3461178.....1 1/32 73-74.. Floating caliper, Manual..3580146.....1 1/32 73-74.. Floating caliper, Power.. 3580112........15/16 1976?...............................____4647..........15/16
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Re: Master Cylinder - Manual Front Disk
[Re: dd340]
#2243254
01/29/17 04:25 AM
01/29/17 04:25 AM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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master
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Washington
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Let us know what you did when you finish.
I have used the 15/16 MC many times and always it stopped better than power brakes.
I know most of us are used to a relatively short pedal travel, but I prefer a bit longer throw. I've seen guys run their stuff big enough that the pedal acted like a toggle switch. Plus, it had a bit more effort.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Master Cylinder - Manual Front Disk
[Re: dd340]
#2243316
01/29/17 12:50 PM
01/29/17 12:50 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
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up yours
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Longer throw makes for better brake modulation if you drive it hard.
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: Master Cylinder - Manual Front Disk
[Re: Mattax]
#2243369
01/29/17 02:21 PM
01/29/17 02:21 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
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up yours
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That depends. Its not a good a rule of thumb. It needs to be like Goldilock's porridge... just right. Yes if its too hard to apply the force, then more throw can help. But definately don't want too much. That's disconcerting!
Most race drivers prefer to control by modulating force rather than distance the foot travels. For example see Carroll Smith, Tune to Win, 1978, pages 111-12.
My own experience has been that this applies to street and autocross as well. I prefer to modulate using the heel and ankle rather than moving the leg from the knee. Heel rests on the floor. Obviously if the required force can not be easily applied, the smaller piston may be needed. Sometimes all it needs is a change of pad compounds to ones with more bite. This usually comes with increases in pad wear, but its worth it. It is much easier to modulate, for example, 300 psi of brake pressure over 2" of travel than 1/2". Too little travel gives you the on/off effect. Too much can wear you out, but I find more is better than less.
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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