master cylinder????
#1357630
12/23/12 02:09 PM
12/23/12 02:09 PM
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Joined: Aug 2007
Posts: 2,449
nc
earthmover
OP
top fuel
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OP
top fuel
Joined: Aug 2007
Posts: 2,449
nc
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ok guys I have found so many diff. part #'s for the mopar master ..which 1 do you guys use??? my car has the master under the floor and disc on all corners.. #'s I have found are raybestos mc 39178/39476 autozone r23804 carquest brp201860 I know the boro size is diff. on some but wwhich would work best for me??? be nice if I can pick 1 up from the local parts house...guess I am getting my winter ???? in lol 
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Re: master cylinder????
[Re: earthmover]
#1357631
12/23/12 03:06 PM
12/23/12 03:06 PM
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Joined: Mar 2006
Posts: 9,895
MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,895
MI, usa
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I used a 1.032" bore with 4 piston Will Woods,. Stock B-body pedal ratio. Pedal was soft and had trouble generating 800PSI. Now have 1.125", much better, will surpass 1000PSI. Mark Williams has an excellent layout for brakes. http://www.markwilliams.com/braketech.aspxDoug
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Re: master cylinder????
[Re: earthmover]
#1357632
12/23/12 03:42 PM
12/23/12 03:42 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
ok guys I have found so many diff. part #'s for the mopar master ..which 1 do you guys use??? my car has the master under the floor and disc on all corners..
#'s I have found are
raybestos mc 39178/39476
autozone r23804
carquest brp201860
I know the boro size is diff. on some but wwhich would work best for me??? be nice if I can pick 1 up from the local parts house...guess I am getting my winter ???? in lol
Pedal ratio is a big factor, along with what size
calipers
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Re: master cylinder????
[Re: earthmover]
#1357634
12/23/12 09:36 PM
12/23/12 09:36 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
ok I will check and see what ratio I have tom.. but I do have 4 piston calipers on all coners
Also make sure you have residual valves on both front and rear
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Re: master cylinder????
[Re: 572charger]
#1357637
12/24/12 09:57 AM
12/24/12 09:57 AM
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Joined: Mar 2006
Posts: 9,895
MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,895
MI, usa
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Quote:
pedal ratio is the key ! i used one from the parts store with a inch and a eighth bore and i needed 2feet on the pedal to stop the car going around the block!! iput the mopar 15/16 bore master one and it stopped great after 8 yrs it went bad and they don't make it anymore so i got a wilwood 1 inch bore on it now and it is harder [need more pressure on the pedal] to stop but works ok i am going to try the wilwood 7/8 bore next should need less pressure on the pedal to stop. ive got wilwood disc ft and rear 
Jim ,very interesting. I would have thought the 64 B Body and the Charger to have the same pedal ratio. My problem was just the opposite, I could push mine to the floor with the 1.032". pedal ratio is 7.5-1.
Doug
Doug
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Re: master cylinder????
[Re: 572charger]
#1357638
12/24/12 11:40 AM
12/24/12 11:40 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
pedal ratio is the key ! i used one from the parts store with a inch and a eighth bore and i needed 2feet on the pedal to stop the car going around the block!! iput the mopar 15/16 bore master one and it stopped great after 8 yrs it went bad and they don't make it anymore so i got a wilwood 1 inch bore on it now and it is harder [need more pressure on the pedal] to stop but works ok i am going to try the wilwood 7/8 bore next should need less pressure on the pedal to stop. ive got wilwood disc ft and rear
I put a 7/8" on my Rampage... has a great feel to the
pedal and stops great... I cut my pedal to change the
ratio and to get the pedal to fit the car better
(so my heel is on the floor and the ball of my foot
is contacting the pad on the pedal)... the race car
has a 1" master but I have a bigger pedal ratio
(the master sits higher in the chassis)... I have
a FEW pedals laying around so I pick one thats close
to what I need and some times need to customize it
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Re: master cylinder????
[Re: dvw]
#1357639
12/25/12 09:11 AM
12/25/12 09:11 AM
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Joined: Jan 2003
Posts: 3,575
The Netherlands
BigBlockMopar
master
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master
Joined: Jan 2003
Posts: 3,575
The Netherlands
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Quote:
I used a 1.032" bore with 4 piston Will Woods,. Stock B-body pedal ratio. Pedal was soft and had trouble generating 800PSI. Now have 1.125", much better, will surpass 1000PSI. Mark Williams has an excellent layout for brakes.
http://www.markwilliams.com/braketech.aspx
Doug
Recheck your numbers, as they don't add up... A larger diameter MC does not provide more line-pressure.
The old MC probably bottomed out in it's bore or your pedal was contacting the floor like you mentioned earlier.
The MarkWilliams link has some good pointers to keep in my on a brake system.
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Re: master cylinder????
[Re: BigBlockMopar]
#1357641
12/25/12 12:33 PM
12/25/12 12:33 PM
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Joined: Mar 2006
Posts: 9,895
MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,895
MI, usa
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Quote:
Quote:
I used a 1.032" bore with 4 piston Will Woods,. Stock B-body pedal ratio. Pedal was soft and had trouble generating 800PSI. Now have 1.125", much better, will surpass 1000PSI. Mark Williams has an excellent layout for brakes.
http://www.markwilliams.com/braketech.aspx
Doug
Recheck your numbers, as they don't add up... A larger diameter MC does not provide more line-pressure.
The old MC probably bottomed out in it's bore or your pedal was contacting the floor like you mentioned earlier.
The MarkWilliams link has some good pointers to keep in my on a brake system.
I agree 100%. The smaller master had so much ratio I could send the pedal to the firewall. I knew the master should have been 1.125". But being CHEAP, I already had a brand new 1.032". I said it's only .093" different, how bad could it be? Bad. Live and learn,follow the chart.
Doug
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Re: master cylinder????
[Re: earthmover]
#1357644
12/25/12 06:57 PM
12/25/12 06:57 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
yes I was going to ask if I need 2 1 front and 1 back.. and as close to the master as possible ....plan to start running the lines in the next few days I hope.. 
If the master is lower than both sets of brakes you
will need 2, one in front and back
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