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Old 07-25-2009, 08:37 PM
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manual brakes

I've got vaccumn problems with my existing booster setup so i found a manual booster. Will this manual booster run my 79 trans am front disc rear drum brakes. I know they are not as good but for now will they work ok, Thanks

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Old 07-25-2009, 08:50 PM
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Quote:
Originally Posted by ssonny34@yahoo.com
I've got vaccumn problems with my existing booster setup so i found a manual booster. Will this manual booster run my 79 trans am front disc rear drum brakes. I know they are not as good but for now will they work ok, Thanks
The m/c is different from the power and the manual, the rod is different the bore in the master cylinders are different sizes. Cole
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Old 07-26-2009, 06:56 AM
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manual brakes

my question was will it run my brakes ok., I built a rod the master cylinder bolted to my firewall with the existing bolts just fine the lines hooked up fine to. But when I push on the pedal will this setup work to stop my car.
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Old 07-26-2009, 11:06 AM
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Quote:
Originally Posted by ssonny34@yahoo.com
my question was will it run my brakes ok., I built a rod the master cylinder bolted to my firewall with the existing bolts just fine the lines hooked up fine to. But when I push on the pedal will this setup work to stop my car.
My answer is, If you have the right diameter rod and the correct length and everything bolts up properly then i don't see any reason why it wont work till you can get the correct parts to fix properly, Just remember this is the break system you are talking about you go changing things and stuff happens, When it come to brakes either do it right or leave it alone, but it should be fine if you have everything lined and bolted up properly .IMO. Cole

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Old 07-27-2009, 07:25 PM
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manual boster? what is a manual booster? did you mean the hydro-boost unit that uses pressurized fluid from the power steering pump?

Augusto.
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Old 07-27-2009, 07:51 PM
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Did you move the brake pushrod to the upper hole on the brake pedal?? It is the hole used by the factory with manual brakes, provides more leverage and a straight link to the master cylinder. Might be a brake light switch tab bolted into this hole on pedal arm. Otherwise pedal will feel hard.

Should be fine otherwise, did this to my power brake front disc '72 Nova to get manual brakes for drag use.
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Old 07-31-2009, 09:17 PM
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manual brakes

thanks eric appreciate the help. To augusto its not pressurized off the power steering its just a a standard brake manual setup but theres no vaccumn booster just foot power so to speak. Old rigs fifties and 60's had these units. I know its outdated but till i can afford to buy a pump 7 inch booster etc, it'll have to work. We just built a rod which was pretty basic and everything lined up good. Just havent road tested. I'll be careful, I've just never pushed on manual brakes that i know of. My dad says they'll skid the tires so it should work. Thanks everyone who helped me.
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Old 07-31-2009, 10:25 PM
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you confused me by using the word "booster" which is not used when manual non-asisted brakes are used.

currently the most common boosters are vaccum and hydro-boost

manual brakes are used mostly on race cars and they work very well

here I've driven some old cars that had manual brakes and though they are harder on the pedal they brake very well

vaccum boosters arrived so women and older people could drive the cars safelly and they ended up very practical and comfortable so we "rude" males ended up loving them.

Augusto
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Old 08-01-2009, 07:04 AM
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There is one change that has been mentioned that you need to do. This is to change the pedal ratio. The poster above referred to swapping out where the pushrod connects to the pedal. This "extra" mounting position is not in place on all vehicles and will need to be added.

Power assist master cylinders usually have about a 4:1 pedal ratio.

Manual master cylinders work best with a pedal ratio of 6:1 or even 7:1.

If you switch from power assist to manual and do not change the pedal ratio; it will take a lot of pedal pressure to stop/activate the brakes. On a heavier vehicle you will not be pleased with the results.
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Old 08-02-2009, 08:21 PM
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I have been wondering about the pedal ratio for the brakes I'm building for my racing go-kart and didn't have a starting number, I know now it should be between 6 to 7:1

thanks for the info.

Augusto.
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