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10-07-2018, 08:10 AM
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#1 |
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Registered User
Join Date: Aug 2015
Location: Texas
Posts: 328
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Power drum brakes
I had my power drum brake booster replaced about a month ago and really haven't driven it since. Now when I go to drive it I have to stand on brakes to get the truck to stop. If I drive for about 5-10 minutes brakes start working better. Any idea why this would be happening and what I need to do to correct/fix it?
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10-07-2018, 09:09 AM
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#2 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,735
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Re: Power drum brakes
How much vacuum does your motor produce?
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10-07-2018, 09:23 AM
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#3 |
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Registered User
Join Date: Aug 2015
Location: Texas
Posts: 328
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Re: Power drum brakes
I have no idea. It's a 383 stroker engine.
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10-07-2018, 10:32 AM
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#4 | |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,735
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Re: Power drum brakes
Quote:
Your booster needs likely a minimum of 12 to 14 hg of vacuum to operate. If your motor doesn’t produce enough vacuum you’ll need to increase the vacuum by fine tuning your motor to get the vacuum higher. Or you might need a vacuum pump to increase the vacuum to the booster. What are the specs on your motor? What cam? What carb and intake? What’s your timing curve like? Where in Texas do you live? |
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10-07-2018, 11:00 AM
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#5 |
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Registered User
 Join Date: Jul 2015
Location: 2nd left past the stump on a dirt road.
Posts: 2,629
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Re: Power drum brakes
Geezer is spot on. Most guys opt for the Hydra-Boost unit from later model GM vehicles to make it a gripper.
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10-07-2018, 11:15 AM
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#6 |
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Registered User
Join Date: Aug 2015
Location: Texas
Posts: 328
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Re: Power drum brakes
Just looked at it again and found the brake booster fitting was cracked. I'll replace it later today when I make it to the parts store. Hoping that will be the fix.
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10-07-2018, 06:42 PM
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#7 |
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Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,723
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Re: Power drum brakes
Yeah, not much vacuum assist from that bad boy.
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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10-07-2018, 11:22 PM
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#8 |
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Registered User
Join Date: Sep 2014
Location: Richfield, Oh
Posts: 112
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Re: Power drum brakes
Since we're on this topic, will a booster from say... a 69 Camaro work? I have Factory item usually seen in Chevelles and Camaros... one that is tilted back on the bracket a bit but the rod looks like it will hook up properly. I might have to fab something different for two bolts of the bracket.
Any chance of using that? |
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10-08-2018, 01:09 PM
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#9 | |
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Registered User
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 2,177
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Re: Power drum brakes
Quote:
__________________
"Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC |
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