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11-06-2014, 10:16 AM
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#1 |
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Registered User
 
Join Date: Nov 2014
Location: Topeka, KS
Posts: 8
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Power Brakes
Hey guys I'm new to the forum. I just put power brakes on my 71 C10. I'm having problems with the brake pedal return to its position after I step on the brakes. It comes back some but doesn't release all the way, so I have to pull up with my foot to fully release the brakes. I've tried a new brake pedal spring thinking the other may have been worn out but that didn't help. I've adjusted the pedal travel distance. Is there such a thing as too much vacuum? The booster is a bolt on kit from classic performance products. Any thoughts would help?
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11-06-2014, 11:37 AM
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#2 |
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Registered User
Join Date: Oct 2014
Location: Daphne, AL
Posts: 10
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Re: Power Brakes
Disc or drum brakes? Is the brake pedal rod binding? Does the brake pedal have more than one hole for the brake rod?
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11-06-2014, 11:41 AM
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#3 |
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Registered User
Join Date: Nov 2014
Location: Topeka, KS
Posts: 8
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Re: Power Brakes
Disk in the front and drums in the back. Only 1 hole on the brake pedal. It doesn't appear to be binding up. If i disconnect the vacuum hose from the manifold it works like manual brakes and the pedal returns normally?
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11-06-2014, 11:54 AM
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#4 |
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Registered User
Join Date: Oct 2014
Location: Daphne, AL
Posts: 10
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Re: Power Brakes
Are the disc brakes stock or did you convert from drum?
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11-06-2014, 11:57 AM
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#5 |
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Registered User
Join Date: Nov 2014
Location: Topeka, KS
Posts: 8
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Re: Power Brakes
stock
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11-06-2014, 12:46 PM
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#6 |
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Registered User
Join Date: Oct 2014
Location: Daphne, AL
Posts: 10
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Re: Power Brakes
If nothing is binding, The internal booster spring isn't strong enough to overcome the vacuum or air is being trapped behind the booster diaphragm. I would call CPP and ask them about it. I don't ever remember seeing anything in-line to reduce vacuum going to a booster.
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11-06-2014, 01:58 PM
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#7 |
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Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Power Brakes
Any hissing under the dash? It could be the valve is sticking open.
__________________
My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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11-06-2014, 07:49 PM
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#8 |
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Registered User
Join Date: Nov 2014
Location: Topeka, KS
Posts: 8
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Re: Power Brakes
no there is no hissing either
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11-06-2014, 08:59 PM
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#9 |
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Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,334
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Re: Power Brakes
Unhook the booster (plug the vacuum line) and see if that makes a difference. If not, then its likely not related to it at all.
When I did my drum-disc conversion I used a bunch of new parts so had to reset the pedal depth with the turnbuckle rod (or whatever its called). I was able to bring the pedal back enough to touch the stop on return (then adjusted to spec). The shop manual has both the procedures on how to do it and the specs on where it should wind up, and the tolerances for how far it can be out. I'd follow that set of adjustment steps and see where it winds up. If no parts have changed, however, a failure is more likely than a misadjustment.
__________________
1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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