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Author
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Topic: Master Cylinder Problem/disc brake swap
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MidLifCrisis
Gearhead Posts: 673
From: Frederick County, MD
Registered: Oct 2001
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posted 12-18-2002 10:29 PM
 
I swapped to '70 Cougar front discs in my '67 Mustang convert. I tried using a '76 Maverick non-power master cylinder. I had to shortened the push rod approx 1", because it was too long and kept the brake light on.
The car stops, but the pedal is soft. It goes down what seems like 2-3" before it gives positive stopping action. Probably just 1/2" from the floor. I have seen suggestions on using other master cylinders like from a Ranger. Can anyone out there give me specifics? Year, part #, etc. I don't want to swap brake pedal assemblies. I will go power-assisted if I must. Anyone out there have first hand knowledge on what to use to get back a firm pedal? Please enlighten me. Thanks, Charlie
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rm302 boss
Gearhead Posts: 680
From: Austin Texas
Registered: Dec 2002
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posted 12-18-2002 11:25 PM
I have run in to the same thing before.
I tried three diffrent masters and ended up using a 1 1/16 bore Wilwood master from Summit.
Also do one thing before any thing else and change both front rubber lines... i had a car that the lines would swell up every time you worked the brakes. I used a set of stainless from Earls. they were cheaperr and better than the origonal ones. I hope my suffering helps you out.
Rene------------------
1970 Boss 302
1990 Taurus SHO
1985 Mustang GT 351W
1995 Land rover Disco
1980 Triumph Spitfire (auto-X car)
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MidLifCrisis
Gearhead Posts: 673
From: Frederick County, MD
Registered: Oct 2001
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posted 12-19-2002 10:57 PM
rm302Boss, Thanks for the reply.I have Russell braided front lines, so the hoses aren't an issue. Whose front disc's did you use? Is the Wildwood m.c. power or manual? Charlie
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brockjoe
Gearhead Posts: 961
From: Sioux City, Iowa
Registered: Oct 99
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posted 12-20-2002 07:53 AM
make sure the bleeder screws are at the very top, sounds like air to me------------------
Joe
71 Coupe
302 w/2x4
73 Coupe parts car.
Boycott NASCAR
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rm302 boss
Gearhead Posts: 680
From: Austin Texas
Registered: Dec 2002
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posted 12-20-2002 10:13 AM
quote:
Originally posted by MidLifCrisis:
rm302Boss, Thanks for the reply.I have Russell braided front lines, so the hoses aren't an issue. Whose front disc's did you use? Is the Wildwood m.c. power or manual? Charlie
I usd the Wilwood set up up front.The master is a manual 1 1/16 bore master cylinder. Here is some real good information on brakes from Dean Ohsiro.. He build's Hot rod Chasis. This is where i found out i had a to small master cyl bore for the same brake system you have now. It gave me gray hair for some time. I had the same problem... every one told me i had air in the system i bleed it over and over. still had the same soft pedal.
Rene
http://www.hotrodheaven.com/tech/brakes/brakes2_index.htm
[This message has been edited by rm302 boss (edited 12-20-2002).]
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Mpcoluv
Gearhead Posts: 1421
From: Charlotte NC usa
Registered: Apr 2001
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posted 12-20-2002 12:01 PM
quote:
I usd the Wilwood set up up front.The master is a manual 1 1/16 bore master cylinder. Here is some real good information on brakes from Dean Ohsiro.. He build's Hot rod Chasis. This is where i found out i had a to small master cyl bore for the same brake system you have now. It gave me gray hair for some time. I had the same problem... every one told me i had air in the system i bleed it over and over. still had the same soft pedal.
Rene
http://www.hotrodheaven.com/tech/brakes/brakes2_index.htm
[This message has been edited by rm302 boss (edited 12-20-2002).][/B]
Dean's math is wrong for the tandem master cylinders. This is a big deal.
See the Fred Puhn book for the correct data.
The Tandem master Cylinders (with the link bar set in the middle) do not produce any more pressure than the 1 1/16" wilwood master.
[This message has been edited by Mpcoluv (edited 12-20-2002).]
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rm302 boss
Gearhead Posts: 680
From: Austin Texas
Registered: Dec 2002
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posted 12-20-2002 08:15 PM
What book would that be? you have my interest...
I have the one from HP books. which i have to say opend my eyes quite a bit. I good friend of mine used it and Ford parts book and installed ABS in a Pinto wagon.... Yes i did say a Pinto wagon. It has a SVO 4 cyl 2300 series motor that on a rear tire dyno put down 217 hp and get this 286 lb of torque!!! had i not been standing there (with my mouth wide open) i would never believe it. Tis guy is a master of putting together odd cars. this was his Auto X car.
Sorry to get off subject like that. I got my Wilwoods from Dean for 4 and a quarter. Not to bad...
Rene
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Mpcoluv
Gearhead Posts: 1421
From: Charlotte NC usa
Registered: Apr 2001
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posted 12-23-2002 06:45 AM
quote:
Originally posted by rm302 boss:
What book would that be? you have my interest...
I have the one from HP books. which i have to say opend my eyes quite a bit. I good friend of mine used it and Ford parts book and installed ABS in a Pinto wagon.... Yes i did say a Pinto wagon. It has a SVO 4 cyl 2300 series motor that on a rear tire dyno put down 217 hp and get this 286 lb of torque!!! had i not been standing there (with my mouth wide open) i would never believe it. Tis guy is a master of putting together odd cars. this was his Auto X car.
Sorry to get off subject like that. I got my Wilwoods from Dean for 4 and a quarter. Not to bad...
Rene
The Book is "The Brake Handbook" by Fred Puhn.
Pretty good book.
Has all of the formulas to design a braking system from scratch.
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rm302 boss
Gearhead Posts: 680
From: Austin Texas
Registered: Dec 2002
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posted 12-23-2002 07:12 PM
hey, thanks (Sorry to hi jack your post)
I'll be going now...
Rene
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SteveLaRiviere
Administrator Posts: 48752
From: Saco, Maine
Registered: May 99
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posted 12-23-2002 07:16 PM
quote:
Originally posted by rm302 boss:
I good friend of mine used it and Ford parts book and installed ABS in a Pinto wagon....
That's an odd mod.  ------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Be sure to remember our sponsors, Mustangs Plus, NPD, and Osborn Reproductions.
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