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  #1 (permalink)  
Old 10-28-2007, 11:50 AM
weirdbeard's Avatar
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Power brakes not powering...

I finally get to ask a question about my hotrod instead of my yukon!
My 67 Camaro has the brake system off a 69. After I tore everything apart on the front end and put it back together the power brakes stopped working. I have a new carb. Holley avenger 770 and a new intake a holley street dominator. I have the booster hooked to the back of the carb. I also tried the front.
I can't imagine why the booster would go bad. Is there a way to test it?
Also when I step on the brake while the car is idling the idle speed increases. What do you guys make of that?

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Old 10-28-2007, 05:58 PM
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Hi,
It sounds like you need a new booster.
When you step on the brake pedal does
it make a loud sucking noise as the pedal
travels to the floor?
rich
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Old 10-28-2007, 06:38 PM
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It sounds like you need a new booster.......the diaphram probly has a hole or a crack in it.
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Old 11-03-2007, 01:42 PM
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Well crap! Thats not what I wanted to hear. I will price new boosters I guess. This should confuse the kids at the parts store. 67 camaro with 69 front discs. Master and booster?????
I do hear a sucking noise while the car is running. I don't think it changes when I hit the brake.
What do you guys think about the car idling up when I hit the brake?
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Old 11-07-2007, 07:01 PM
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Quote:
Originally Posted by weirdbeard
What do you guys think about the car idling up when I hit the brake?
The booster has a leak in the diaphragm, when you hit the
brakes, a valve on the pedal side opens, and with a knackered
diaphragm, air is added to the engine on the underside of the
carb. So if you're running a bit rich at idle... the idle speed
will go up...

K
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Old 11-08-2007, 02:28 PM
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Quote:
Originally Posted by bates_k
The booster has a leak in the diaphragm, when you hit the
brakes, a valve on the pedal side opens, and with a knackered
diaphragm, air is added to the engine on the underside of the
carb. So if you're running a bit rich at idle... the idle speed
will go up...

K
Cool! Well thanks for the info.
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Old 11-08-2007, 06:37 PM
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Just a guess..... as usual. the vacuum check valve is in backwards.
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Old 11-08-2007, 07:15 PM
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Go Hydroboost!







{ to the Youngest guy on the forum}




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Old 11-10-2007, 10:29 AM
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Quote:
Originally Posted by Dugg
Just a guess..... as usual. the vacuum check valve is in backwards.
Check valve? What would happen if there was no such thing?
Rob I always wanted a hydro boost. They just seem neat and weird.
Do you think my age has something to do with nobody taking me seriously here? I can't believe I forgot the check valve!
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Old 11-10-2007, 10:38 AM
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There is a check valve usuallay mounted right on booster where you plug in the vac. line. If this goes bad you will only have boost when there is vac in the intake. It also will not hold vac.
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Old 11-10-2007, 04:12 PM
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I will tell you
I have Hydro on the Pick up I just built this year & I was looking @ it all weirs & stuff but when I forget its a stick & come up to a red light I wonder why the motor shut off

DUH forgot to take it out of gear & the hydroboost don't care its just stops!

I am putting the same set up on my BURB too! no more vacuum brakes for me!

Not only that it makes the power steering better .it has that one finger twist like my LeMans does



R
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