four wheel disc don't stop car
#1389420
02/18/13 12:51 AM
02/18/13 12:51 AM
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Joined: Mar 2010
Posts: 142 Petaluma, CA
JimDiesel
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Petaluma, CA
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I am having trouble with the brakes on my road runner. They dont stop the car very well. They seem to require an extreme amount of pedal pressure to work. panic stopping from 40 MPH I couldn't get the tires to lock up. I think it is a SSBC kit that was installed mid 90s. The pedal feel is ok, pumping them doesn't seem to make them work any better. I don't have a brake pressure gauge, but i can but one if needed. Right now the car isn't driven due to brakes. The brake lines look kinda scary. The rotors are like 10.5 rear, 10.75 front, but only about 0.75 inch wide. Are they undersized? Anyone know what kit this is? Are they any good? What spindles do I have? Are the rear caliprs on upside down? bleeder appears to be on bottom. Do any vendors make brake line kits for this setup? Do i need a power booster? It has a crate hemi using schumacher mounts - so not sure if I an fit one in. Advice on how to assess/fix. Help me get again Pics
Last edited by JimDiesel; 02/18/13 01:59 AM.
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Re: four wheel disc don't stop car
[Re: JimDiesel]
#1389421
02/18/13 12:52 AM
02/18/13 12:52 AM
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Joined: Mar 2010
Posts: 142 Petaluma, CA
JimDiesel
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Drive side rear bleeder is on lower part of caliper
Last edited by JimDiesel; 02/18/13 01:02 AM.
68 Road Runner 67 Coronet
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Re: four wheel disc don't stop car
[Re: JimDiesel]
#1389425
02/18/13 12:54 AM
02/18/13 12:54 AM
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Joined: Mar 2010
Posts: 142 Petaluma, CA
JimDiesel
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scary looking brake hose routing
Last edited by JimDiesel; 02/18/13 01:03 AM.
68 Road Runner 67 Coronet
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Re: four wheel disc don't stop car
[Re: JimDiesel]
#1389426
02/18/13 12:54 AM
02/18/13 12:54 AM
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Joined: Mar 2010
Posts: 142 Petaluma, CA
JimDiesel
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SSBC proportioning valve
Last edited by JimDiesel; 02/18/13 01:04 AM.
68 Road Runner 67 Coronet
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Re: four wheel disc don't stop car
[Re: JimDiesel]
#1389429
02/18/13 12:57 AM
02/18/13 12:57 AM
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Joined: May 2003
Posts: 96,666 On The Boat, On The Lake, Wa. ...
amxautox
Still Retired. Still Posting on Moparts. A Lot.
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Still Retired. Still Posting on Moparts. A Lot.
Joined: May 2003
Posts: 96,666
On The Boat, On The Lake, Wa. ...
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Bleeders go to the top,-- ALWAYS -- so the air can rise to the top and get pushed out.
What is the bore size of the front calipers? The rear calipers?
What is the bore size of the master cylinder?
What is the equalizer valve in the system? porportioning valve?
Tom
"Everyone should believe in something; I believe I'll go fishing."
-Henry David Thoreau
Men and fish are alike. They both get into trouble when they open their mouths
author unknown
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Re: four wheel disc don't stop car
[Re: JimDiesel]
#1389431
02/18/13 01:00 AM
02/18/13 01:00 AM
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Joined: Mar 2010
Posts: 142 Petaluma, CA
JimDiesel
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Drivers side front
Last edited by JimDiesel; 02/18/13 01:05 AM.
68 Road Runner 67 Coronet
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Re: four wheel disc don't stop car
[Re: JimDiesel]
#1389434
02/18/13 01:12 AM
02/18/13 01:12 AM
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Joined: Jan 2007
Posts: 780 Woodinville, WA
Viol8r
super stock
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super stock
Joined: Jan 2007
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Woodinville, WA
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Quote:
4
Going to take a stab at it and say that is a early GM/ Corvette style M/C size 1 1/8" bore. That is most likely the start of your problems. They would assume that with that size bore you would have some power assist behind it. Not a great combo for a manual set-up.
If you are willing to spend some cash, go hydroboost and all your problems will magically disappear. Less adventerous folks would say get a 4 hole to 2 hole adapter and put a 15/16 M/C bore on there.
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Re: four wheel disc don't stop car
[Re: Viol8r]
#1389436
02/18/13 02:08 AM
02/18/13 02:08 AM
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Joined: Mar 2010
Posts: 142 Petaluma, CA
JimDiesel
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This shows the bleed valves (red arrow), assumed caliper center (orange line), and brake hose near the bump stop (yellow arrow).
I am not sure a hydroboost will fit with a hemi.
68 Road Runner 67 Coronet
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Re: four wheel disc don't stop car
[Re: JimDiesel]
#1389437
02/18/13 02:10 AM
02/18/13 02:10 AM
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Joined: Jan 2003
Posts: 31,074 Oregon
AndyF
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I Win
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Oregon
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The rear brakes are probably okay, the fronts are garbage for a car like yours, as is the master cylinder. That is a typical problem with those kits. If you have 15 inch wheels then your best bet is to put a factory 11.75 kit on there. It should work okay with those rear disc brakes. You'll want to get the right master cylinder too while you're at it. Cass at www.doctordiff.com can set you up with all the right parts. He is the best guy to talk to on a deal like this. Good luck.
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