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Re: All new brakes, low and hard pedal
[Re: ChallengerGary]
#1568437
02/04/14 11:29 AM
02/04/14 11:29 AM
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Joined: Jan 2009
Posts: 813
Ontario,Canada
brads70
super stock
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super stock
Joined: Jan 2009
Posts: 813
Ontario,Canada
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Quote:
Quote:
do you have an adjustable valve on the rear line to adjust the rear brakes from overpowering the fronts?
Not yet. Guess that is the next step...
When I had a drum brake rear I plumbed in a adjustable valve for the rears. I also used the truck wheel cylinders. I never had to use the valve it was always wide open and never had a problem locking up the rears first?
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Re: All new brakes, low and hard pedal
[Re: brads70]
#1568438
02/05/14 05:11 AM
02/05/14 05:11 AM
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Joined: Nov 2008
Posts: 1,491
Lethbridge, AB, Canada
dangina
pro stock
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pro stock
Joined: Nov 2008
Posts: 1,491
Lethbridge, AB, Canada
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Quote:
Quote:
Quote:
do you have an adjustable valve on the rear line to adjust the rear brakes from overpowering the fronts?
Not yet. Guess that is the next step...
When I had a drum brake rear I plumbed in a adjustable valve for the rears. I also used the truck wheel cylinders. I never had to use the valve it was always wide open and never had a problem locking up the rears first?
did you have a front drum setup as well? I have read that the problem lies more on when you have a disk front/drum rear proportioning valve when switching to disk brakes on all 4 corners
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Re: All new brakes, low and hard pedal
[Re: dangina]
#1568439
02/05/14 05:42 AM
02/05/14 05:42 AM
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Joined: May 2007
Posts: 553
Sac, CA, USA
ntstlgl1970
mopar
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mopar
Joined: May 2007
Posts: 553
Sac, CA, USA
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Are all the caliper bores and wheel cylinder bores the correct size for that bore of master cylinder? (and what are they) Bendix or Raybestos catalogs used to provide this information. Is the brake light switch adjusted too tight (meaning the pedal cannot fully return) which would have the same affect as the master cylinder pushrod being too long and covering the rear compensating port in the master cylinder which would give a low pedal. As far as the assist goes, I'm wondering if the booster size is too small in diameter. Most of the OE mopar stuff was 10 or 11" if I remember right. Some of the street rod stuff use a small diameter dual diaphragm booster, but it doesn't sound like that is what you have. I can't think of any power brake old mopar with functioning assist that had a hard pedal with the engine running stock. "Squishy" is the term that comes to mind. as far as the rear brakes locking up (if the wheel cylinder bores are matched to the master), are the backing plates grooved? Are the primary shoes (shorter length friction) torwards the front of the car? Are the primary and secondary return springs in the right spots? Are the parking brake cables adjusted too tight?
Did the customer provide any info on how the brakes were before changing all this stuff? (was this a problem prior to changing the booster/master?)
Maybe start by isolating the master - replace one or both lines with a plug(s) and see if the pedal function is correct. we don't have any idea what the original application was for the booster/master on there now other than it came from ebay.
Last edited by ntstlgl1970; 02/05/14 05:47 AM.
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Re: All new brakes, low and hard pedal
[Re: V8val]
#1568446
02/06/14 12:11 PM
02/06/14 12:11 PM
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Joined: Aug 2003
Posts: 2,143
Port Saint Lucie, FL
ChallengerGary
OP
top fuel
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OP
top fuel
Joined: Aug 2003
Posts: 2,143
Port Saint Lucie, FL
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Quote:
Sorry to do my first post here, but it sounds to me like maybe the hole in your brake pedal arm is maybe in the wrong spot? Where the pushrods connects to the arm? An inch up or down can make a huge difference......
I will take a look at that - thanks
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Re: All new brakes, low and hard pedal
[Re: ChallengerGary]
#1568447
02/06/14 08:08 PM
02/06/14 08:08 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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Those small Chinese brake boosters are complete junk. We have had better luck with small import booster that were used.
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: All new brakes, low and hard pedal
[Re: V8val]
#1568449
02/07/14 02:02 PM
02/07/14 02:02 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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Quote:
Oh I see, I've only seen a body stuff. Thanks for filling me in. I'm in Australia, all our Chrysler stuff is just a brake pedal with different positioned holes in the arm for different brake set ups.....
Well, maybe Chrysler Australia does it different, but in US A bodies there is a, for lack of a better way to describe it, step down linkage between the firewall and booster to drop the pedal ratio in a power brake setup. In a manual setup the master cylinder just bolts to the firewall with a stiffening plate and different pushrod, same pedal assembly, no extra holes.
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: All new brakes, low and hard pedal
[Re: Supercuda]
#1568450
02/07/14 06:44 PM
02/07/14 06:44 PM
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Joined: Sep 2013
Posts: 29
Queensland Australia
V8val
member
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member
Joined: Sep 2013
Posts: 29
Queensland Australia
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Quote:
Quote:
Oh I see, I've only seen a body stuff. Thanks for filling me in. I'm in Australia, all our Chrysler stuff is just a brake pedal with different positioned holes in the arm for different brake set ups.....
Well, maybe Chrysler Australia does it different, but in US A bodies there is a, for lack of a better way to describe it, step down linkage between the firewall and booster to drop the pedal ratio in a power brake setup. In a manual setup the master cylinder just bolts to the firewall with a stiffening plate and different pushrod, same pedal assembly, no extra holes.
Well there ya go 
Thanks for the explanation 
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Re: All new brakes, low and hard pedal
[Re: V8val]
#1568451
02/07/14 07:38 PM
02/07/14 07:38 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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Well, since y'all got the steering wheel on the wrong side they had to do something. Wouldn't surprise me if they used Holden (GM) sourced parts and I know GM, at least here in the states, does use different holes in the pedal setup.
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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