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Author Topic: hard brake pedal, seems no power assist - bad booster?  (Read 7123 times)

Offline fbody

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hard brake pedal, seems no power assist - bad booster?
« on: May 07, 2010, 08:17:43 am »
Well, when i got the truck, it had what appeared to be no booster assist on the power brakes. I replaced the booster with another (used) from a guy who said it worked fine, but again used part.  I have replaced the master cylinder, bled it first on the bench, no issues.  The brake pedal still requires that I press way too hard to stop the truck.  Pedal doesn't go to the floor or anything.

check valve, that simple? or still is the booster prob and I should buy new.  No leaks anywhere.

73 C20, 3/4 ton.

any thoughts?  thanks.
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Offline VileZambonie

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Re: hard brake pedal, seems no power assist - bad booster?
« Reply #1 on: May 07, 2010, 02:10:59 pm »
Pump the brake and hold pressure on the pedal. Start the engine. The pedal should drop. -Report
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Offline fbody

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Re: hard brake pedal, seems no power assist - bad booster?
« Reply #2 on: May 08, 2010, 11:03:10 am »
pedal doesn't drop at all.  pumped it, held it down, started it.. pedal didn't move.  i guess that means booster?
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Offline malibu795

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Re: hard brake pedal, seems no power assist - bad booster?
« Reply #3 on: May 08, 2010, 12:14:39 pm »
check vaccum lines from carb to booster -report
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Offline fbody

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Re: hard brake pedal, seems no power assist - bad booster?
« Reply #4 on: May 08, 2010, 04:16:28 pm »
yep, plenty of vacuum.  pull line, plug it with a bolt, start engine. pull bolt, plenty of vacuum, just about dies.
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Offline VileZambonie

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Re: hard brake pedal, seems no power assist - bad booster?
« Reply #5 on: May 08, 2010, 04:57:01 pm »
Replace the booster if you have vacuum at the check valve.
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              ⌠¯¯¯¯¯'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline fbody

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Re: hard brake pedal, seems no power assist - bad booster?
« Reply #6 on: May 14, 2010, 09:42:01 pm »
yep, replaced booster tonight, that was it.  no more rock hard pedal.  Back to power brakes.  thanks again.
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Offline Irish_Alley

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Re: hard brake pedal, seems no power assist - bad booster?
« Reply #7 on: May 15, 2010, 12:47:21 am »
a question about boosters didn't see the need of adding another post but theres not supposed to be a gaskey between the master cylinder and booster right?
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

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Offline fbody

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Re: hard brake pedal, seems no power assist - bad booster?
« Reply #8 on: May 15, 2010, 09:10:12 am »
there wasn't on mine.. and one didn't come w/ the reman booster either.
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Offline Irish_Alley

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Re: hard brake pedal, seems no power assist - bad booster?
« Reply #9 on: May 15, 2010, 09:12:37 am »
I didn't think so lol mine was sucking in air there so my booster is bad but I got some gasket seal in there for now rigged her right up lol
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes
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