Disc o tech - blues....my 4 wheel drums were better.
#1692649
10/30/14 10:49 PM
10/30/14 10:49 PM
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Joined: Aug 2003
Posts: 643 Toronto, Ontario, Canada
plazomat
OP
mopar
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OP
mopar
Joined: Aug 2003
Posts: 643
Toronto, Ontario, Canada
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Just finished off a disc conversion using.. 10.9 inch rotors - new 72 ebody pin calipers - new 72 ebody spindles (w/bearing adaper) - new 1 1/32 master - new all new lines and hoses 10 * 1/3/4 drums out back, not new but in great shape. no combination or proportioning valve. Brakes just suck - low but hard pedal and I gotta stand on it to stop the car.. Brakes are bled I guess - no spongy but low and hard as hell pedal. I know a combination valve is in order but will that fix the feel of the brakes? - which year/body valve should i get? Will a generic under master cyl gm unit work? I guess I need a residual pressure valve in the rear lines as well - will that fix the pedal height? What steps should I take to resolve this - I don't want to just throw a bunch more variables into this system and never get it right.. Thanks Plaz
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Re: Disc o tech - blues....my 4 wheel drums were better.
[Re: plazomat]
#1692651
10/30/14 11:05 PM
10/30/14 11:05 PM
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Joined: Feb 2005
Posts: 28,312 Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Just finished off a disc conversion using..
10.9 inch rotors - new 72 ebody pin calipers - new 72 ebody spindles (w/bearing adaper) - new 1 1/32 master - new all new lines and hoses
10 * 1/3/4 drums out back, not new but in great shape.
no combination or proportioning valve.
Brakes just suck - low but hard pedal and I gotta stand on it to stop the car..
Brakes are bled I guess - no spongy but low and hard as hell pedal.
I know a combination valve is in order but will that fix the feel of the brakes? - which year/body valve should i get? Will a generic under master cyl gm unit work?
I guess I need a residual pressure valve in the rear lines as well - will that fix the pedal height?
What steps should I take to resolve this - I don't want to just throw a bunch more variables into this system and never get it right..
Thanks Plaz
What makes you think they will work without either valve in there?
How do you have the lines junction ed together now?
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Re: Disc o tech - blues....my 4 wheel drums were better.
[Re: Challenger 1]
#1692653
10/30/14 11:17 PM
10/30/14 11:17 PM
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Joined: Aug 2003
Posts: 643 Toronto, Ontario, Canada
plazomat
OP
mopar
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OP
mopar
Joined: Aug 2003
Posts: 643
Toronto, Ontario, Canada
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Quote:
What makes you think they will work without either valve in there?
How do you have the lines junction ed together now?
The stock drum/drum unit is in there - its just a distribution block and does not provide any valving or metering..
Plaz
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Re: Disc o tech - blues....my 4 wheel drums were better.
[Re: plazomat]
#1692654
10/30/14 11:22 PM
10/30/14 11:22 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
Joined: Sep 2007
Posts: 14,889
up yours
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You really didn't follow the disc-o-tech instructions, now did you.
The M/C is too larger of a diameter.
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: Disc o tech - blues....my 4 wheel drums were better.
[Re: plazomat]
#1692655
10/30/14 11:24 PM
10/30/14 11:24 PM
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Joined: Nov 2005
Posts: 15,119 85086
moparpollack
Lil Herman
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Lil Herman
Joined: Nov 2005
Posts: 15,119
85086
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Pad material can affect stopping ability. My 64 Polara had the lifetime autozone pads that didn't stop for anything.
56 Plaza 63 D100 step side 67 Coronet, 68 Roadrunner, 69 Super Bees, 69 Coronet 500 convertible, 70 Roadrunner Post, 79 D150 360, and a severe case of Mopar a,d,d
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Re: Disc o tech - blues....my 4 wheel drums were better.
[Re: Supercuda]
#1692656
10/30/14 11:30 PM
10/30/14 11:30 PM
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Joined: Aug 2003
Posts: 643 Toronto, Ontario, Canada
plazomat
OP
mopar
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OP
mopar
Joined: Aug 2003
Posts: 643
Toronto, Ontario, Canada
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Quote:
You really didn't follow the disc-o-tech instructions, now did you.
The M/C is too larger of a diameter.
Doesn't he recomend a master from a 76-8 F body? and aren't they 1 1/32? What am I missing here?
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Re: Disc o tech - blues....my 4 wheel drums were better.
[Re: plazomat]
#1692657
10/30/14 11:46 PM
10/30/14 11:46 PM
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Joined: Dec 2007
Posts: 18,157 Mass
DAYCLONA
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 18,157
Mass
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Quote:
Thanks so much for the response..here's more info
Disc/Drum 1 1/32 unit for an 85 dippy - new parts store purchase coni seal brand Manual - no power Manual pedal setup that was in car since new - 4 wheel drums Rear drums adjusted to slight drag
Only a proporting valve or a combo valve (prop/metering functions)
Just throw all parts at car or take in stages?
Plaz
Feedback,...if you repeatedly pump the pedal, does it gain noticeable height?, or maintain about the same height, does maintaining depressed pedal pressure cause the pedal to slowly sink?
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Re: Disc o tech - blues....my 4 wheel drums were better.
[Re: plazomat]
#1692659
10/31/14 01:39 AM
10/31/14 01:39 AM
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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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Quote:
no combination or proportioning valve.
Brakes just suck - low but hard pedal and I gotta stand on it to stop the car..
I think the low pedal is key & others have had to stand on the pedal (at normal height tho) with the wrong bore MC. In my case: 65 dart with 74 A discs (76-2.75 calipers) with aftermarket (ceramic? pads) and a 1&1/8 dual alum MC with adapter plate & 10" (7&1/4) rear drums and OE drum splitter (mismatched system) and it would put me in the windshield if I stood on it. I would put it up on stands have a helper spin the fronts as you work the pedal and idle it in gear & see how the rears act. Holler with any news. I'm thinking inadequate psi (line restriction somewhaere) if there is no mechanical malfunction at the corners but there is something going on/wrong with the low pedal (find/fix that). I had that exact same symptoms (height was OK tho) on the stock car from a braided line bent at too severe of an angle. EDIT Is the MC adapter plate what is making the pedal too low and post what the pedal ratio is
Last edited by RapidRobert; 10/31/14 01:49 AM.
live every 24 hour block of time like it's your last day on earth
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Re: Disc o tech - blues....my 4 wheel drums were better.
[Re: Kern Dog]
#1692663
10/31/14 03:53 AM
10/31/14 03:53 AM
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Joined: Jan 2003
Posts: 1,043 Slidell, La.
doctor_mopar
super stock
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super stock
Joined: Jan 2003
Posts: 1,043
Slidell, La.
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I would say a smaller bore master cylinder is in order. Of course the proportioning valve also. Take not that a rebuild kit and instructions for the proportioning valve is available cheap from Muscle car research online.
------------------------ It doesn't matter what you do.........As long as you look good doing it !
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Re: Disc o tech - blues....my 4 wheel drums were better.
[Re: doctor_mopar]
#1692664
10/31/14 11:52 AM
10/31/14 11:52 AM
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Joined: Jan 2003
Posts: 21,076 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: 21,076
Niles , Ohio
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I use nothing but 70C body masters.I run Ceramic pads with my pin types on the 65.Stops great and good pedal.The stock spliter will work if you use an adjustable PP valve to the rear.I use 5th Ave PP valves.Mine have been on at leats 15 years and no problems even at 120 it stops great.Rocky
Chrysler Firepower
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Re: Disc o tech - blues....my 4 wheel drums were better.
[Re: plazomat]
#1692665
10/31/14 02:15 PM
10/31/14 02:15 PM
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Joined: Dec 2007
Posts: 18,157 Mass
DAYCLONA
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 18,157
Mass
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After reading some of your feedback, and updates as to what the actual parts are, that are involved in your swap,...IMHO if you want to retain the 2 bolt aluminum F body master, put a booster behind it, and add a proportioning valve to the system, or if manual brakes are your desired goal, then toss the F body master and adapter plate and use a 70 B body or 70-4 E body master designed for manual disc brake application, and add a proportioning valve, if you wish to try/run the B/E body masters, just say so, and I can supply you with the PN# and specs so that you can make an informed choice regarding the proper sizing/application....I'll assume this is for your 69 Coronet?
mike
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Re: Disc o tech - blues....my 4 wheel drums were better.
[Re: dogdays]
#1692668
10/31/14 05:53 PM
10/31/14 05:53 PM
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Joined: Jan 2003
Posts: 21,076 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: 21,076
Niles , Ohio
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10 buck pads cant be too good.My ceramics were 30 bucks like 8 years ago and that was shop price.They work better that the Bendix that cost more 15 years ago.Cheap pads are just that cheap period.Saw too many problems with cheap sets at the shop.Rocky
Chrysler Firepower
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