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Re: converting master cylinder
[Re: 493_DART]
#241561
03/03/09 07:25 PM
03/03/09 07:25 PM
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Joined: Jul 2003
Posts: 2,637
Western Michigan
68Fastback
master
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master
Joined: Jul 2003
Posts: 2,637
Western Michigan
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Quote:
the 86 ram pieces online look like iron ?  should it be a D150 1/2 ton or ?
R5P7Duster-- broke / budget racer here--ill have to do the $35 autozone piece and fab an adapter... 
Don't forget the grommet from the brake rod.
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Re: converting master cylinder
[Re: 8secDart]
#241562
03/04/09 02:02 AM
03/04/09 02:02 AM
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Joined: Jul 2004
Posts: 4,384
Worst Weather USA
493_DART
OP
master
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OP
master
Joined: Jul 2004
Posts: 4,384
Worst Weather USA
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Quote:
My NAPA has a listing on both.I will look at the shop for part #.It will list the bore size at most parts stores.Get the 1 5/8 and your good to go.
im only seeing 1 1/8 bore online --that would be great to get that part # 
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Re: converting master cylinder
[Re: 493_DART]
#241563
03/04/09 04:06 AM
03/04/09 04:06 AM
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Joined: Mar 2008
Posts: 685
Bismarck, ND USA
cageman
mopar
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mopar
Joined: Mar 2008
Posts: 685
Bismarck, ND USA
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I use 85 diplomat when I buy them, 15 bucks, and you will need a junkyard resevoir, they dont come with them. Hmm, big bore hard pedal, no thanks. The diplomat one feels the best.  I make a 1/4 inch alum plate that these bolt too, real easy, the big hole in the center is off set a bit. I traced a four bolt master pattern, then centered the two holes in between the four holes, I tap the two holes and put short studs in there, and done. The lines are backwards on the newer ones, The rear port is the front line on the alum ones.
Last edited by cageman; 03/04/09 04:07 AM.
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Re: converting master cylinder
[Re: 493_DART]
#241564
03/04/09 09:14 AM
03/04/09 09:14 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:
Quote:
My NAPA has a listing on both.I will look at the shop for part #.It will list the bore size at most parts stores.Get the 1 5/8 and your good to go.
im only seeing 1 1/8 bore online --that would be great to get that part #
What brakes are you running, disc/drum or disc/disc
The most you would need is a 1 1/8(never heard of a
1 5/8 on a car... must have been a typo). Did you
start with manual brakes or power. The pedal ratio
is different between the 2
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Re: converting master cylinder
[Re: 8secDart]
#241567
03/04/09 11:25 PM
03/04/09 11:25 PM
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Joined: Jul 2004
Posts: 4,384
Worst Weather USA
493_DART
OP
master
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OP
master
Joined: Jul 2004
Posts: 4,384
Worst Weather USA
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thanks guys ill have to walk the junkyard and find the reservoir i guess. Will the rod that i have now work, even with adding the 1/4" plate ?
Last edited by 496dart; 03/04/09 11:27 PM.
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Re: converting master cylinder
[Re: DoctorDiff]
#241571
03/05/09 09:02 AM
03/05/09 09:02 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:
Use the F-body aluminum master. The truck master has too large of a bore when used with stock, passenger car brakes.
The adapter thickness makes up for the difference in master cylinder design. You do not need to modify the original push rod.
Dr Diff, is the F-body a 15/16" bore(which I believe
should be fine) also hows the difference made up with
using the adapter plate, is the piston moved rearward?
thanks
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Re: converting master cylinder
[Re: B1MAXX]
#241573
03/05/09 06:52 PM
03/05/09 06:52 PM
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Joined: Apr 2004
Posts: 976
Woodstock , Georgia
Mopar_racer_99
super stock
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super stock
Joined: Apr 2004
Posts: 976
Woodstock , Georgia
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Please think about using one of these with modified master cylinders Pushrod kit with safety tab , I had one slip out on Ours in drive way, I had a friend who had one slip out on track, not a nice scene. John
8.72 @ 154.6 ,68 Charger 578ci 440-1s, 3000# w/drvr, 2150 den/alt NA
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Re: converting master cylinder
[Re: DoctorDiff]
#241576
03/05/09 07:48 PM
03/05/09 07:48 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:
OEM 2-bolt aluminum master cylinders with plastic reservoir:
'95 Lebaron 7/8" bore**
'89 Dakota 15/16" bore**
'85 Diplomat (F-body) 1 1/32" bore*
'85 D-150 1 1/8" bore*
**Back of piston must be bored to accept manual brake push rod and retainer.
* Back of piston will accept manual brake push rod and retainer.
Rule of thumb:
1. Master cylinder piston size is relative to caliper piston size. Large caliper pistons require large MC piston.
2. All things equal, smaller bore master = higher line pressure and longer, softer pedal stroke.
Thanks, I didnt know what size the different body
lines used
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Re: converting master cylinder
[Re: 8secDart]
#241578
03/05/09 08:23 PM
03/05/09 08:23 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:
That is why I use the big bore.If you use a lot of braided line the pedal will fill like a soft grapefruit.
I use the braided for the whole set up and it has a
little softness but not much... not worth my changing it
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Re: converting master cylinder
[Re: MR_P_BODY]
#241580
03/05/09 10:43 PM
03/05/09 10:43 PM
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Joined: Jan 2003
Posts: 1,771
St.Clair Shores MI.
tilt
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,771
St.Clair Shores MI.
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Just to clarify:
The 85 diplomat is a "M" body no??
68 CORONET R/T BEST MACHINE BUILT EFI'd TWIN TURBO(UP and RUNNING !!)
03 Mach1
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Re: converting master cylinder
[Re: tilt]
#241581
03/05/09 11:56 PM
03/05/09 11:56 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:
Just to clarify:
The 85 diplomat is a "M" body no??
yes
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Re: converting master cylinder
[Re: MR_P_BODY]
#241582
03/06/09 12:05 AM
03/06/09 12:05 AM
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Joined: Jan 2003
Posts: 6,591
Canton, Ohio
Sport440
master
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master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
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Quote:
Quote:
Just to clarify:
The 85 diplomat is a "M" body no??
yes
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