brake pedal rod, which hole? - Team Camaro Tech
Brakes, Suspension & Steering Conversion questions, Steering & Handling

 
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post #1 of 10 (permalink) Old Jul 20th, 03, 05:32 PM Thread Starter
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I put my brake pedal in finally after a year and could not rmember which hole to hook it up to? Upper or lower? it is power brakes.
Thanks,
Mike

69 RS/SS vert tourer, LS7, T56, Baer, Hydrooost, GW, etc, etc,
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post #2 of 10 (permalink) Old Jul 20th, 03, 06:59 PM
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lower. it should be pretty obvious, as the pushrod comes in at an angle with the power booster, and straight in on a manual setup.

you don't plan sincerity.
you have to make it up on the spot.

wanna hear about 20 years ago when i was too smart to know any better?
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post #3 of 10 (permalink) Old Jul 21st, 03, 08:13 AM
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At least on my booster, there was no way to get the clevis installed in the top hole.

-dnult

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post #4 of 10 (permalink) Old Jul 21st, 03, 09:35 AM Thread Starter
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Great, I have it in the upper hole. Now if I can get some help with these friggen rear ebrake lines for the rear discs I should be set for a coupla days

69 RS/SS vert tourer, LS7, T56, Baer, Hydrooost, GW, etc, etc,
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post #5 of 10 (permalink) Old Jul 21st, 03, 11:14 AM
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What kind of vacuum do you expect with your motor?

Dave
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68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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post #6 of 10 (permalink) Old Jul 21st, 03, 01:58 PM Thread Starter
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I'm not sure I hope enough to run the RS equipment and the brakes how much should I have?

69 RS/SS vert tourer, LS7, T56, Baer, Hydrooost, GW, etc, etc,
Welfare is completely against freedom and the principles of american life, paying people not to work by stealing from the people who do is insanity.
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post #7 of 10 (permalink) Old Jul 21st, 03, 05:31 PM
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A booster in the lower hole gives about a 3:1 pedal ratio. In order for the booster to be effective, you'll need abou 18" of vacuum.

I'm attempting to mount a booster to the top hole (6:1 pedal ratio). I'm doing this because my engine develops only 10" of vacuum. At this point, I don't know if it will work but have high hopes. I had to cut and reweld the booster bracket to line up on the top hole. With my 9" booster I should have near stock boosted performance. We'll see what happens and I'll report back in a few months.

-dnult

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post #8 of 10 (permalink) Old Jul 22nd, 03, 02:29 AM
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I keep reading and hearing that a booster with discs needs 18" of vacuum to work properly. How many Camaros actually have that much vacuum after modifying the engine with bigger cams, etc? Everyone always says "I've got 15-16" of vacuum...." which isn't even close. Where's the extra vacuum coming from while driving?
I don't have an engine built yet but I'm setting the car up for power discs. I want to make SURE I'm sucking like a Hoover at speed so this drum-disc upgrade is worth the money and time. I can always install a auxillary vacuum setup but I don't want that hassle.

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post #9 of 10 (permalink) Old Jul 22nd, 03, 12:57 PM
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Joe. I put together an Excel spreadsheet that calculates brake system pressures based on MS piston size, caliper piston size, and booster pressure / diameter. If you're interested I can send you a copy. 18" on a 1 1/8" MS at a 3:1 pedal ratio is basically what you need to equal a 1" manual MS at a 6:1 pedal ratio.

-dnult

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post #10 of 10 (permalink) Old Jul 22nd, 03, 01:42 PM
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Quote:
Originally posted by HwyStarJoe:
I keep reading and hearing that a booster with discs needs 18" of vacuum to work properly. How many Camaros actually have that much vacuum after modifying the engine with bigger cams, etc? Everyone always says "I've got 15-16" of vacuum...." which isn't even close. Where's the extra vacuum coming from while driving?
I don't have an engine built yet but I'm setting the car up for power discs. I want to make SURE I'm sucking like a Hoover at speed so this drum-disc upgrade is worth the money and time. I can always install a auxillary vacuum setup but I don't want that hassle.
You create LOTS of vacuum at steady-speed cruise and when you back off the gas. Stock Z/28's only generate 9"-10" Hg. at idle, and they all had power disc brakes. The General wouldn't have put boosters on them if they didn't have enough vacuum to operate them. [img]graemlins/thumbsup.gif[/img]

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