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  #16 (permalink)  
Old 05-03-2019, 01:42 PM
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Just checked with speedway the pedal ratio is 6:1 , it's a universal fit part .
Drill a new hole an inch to an inch and a half lower on the pedal to get to 4.5 to 1.
6 to 1 is for manual brakes.

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Old 05-03-2019, 02:22 PM
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The way the pedal is if I drill a hole lower, the clevis on the brake booster shaft will push it slightly up into the booster diaphragm . Right now it is straight and the pedal feel is good. By moving the hole lower to get the 4.5:1 ratio will I be getting a longer travel on the brake push rod ?
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Old 05-03-2019, 03:54 PM
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Quote:
Originally Posted by tools View Post
The way the pedal is if I drill a hole lower, the clevis on the brake booster shaft will push it slightly up into the booster diaphragm . Right now it is straight and the pedal feel is good. By moving the hole lower to get the 4.5:1 ratio will I be getting a longer travel on the brake push rod ?
Lowering the hole will decrease the amount of force you are putting into the master cylinder....the exact opposite of what you want to be doing.

If you can't lock the front rotors, pedal ratio isn't the big problem at 6-1 ratio....you're either not making enough pressure from the master or have a pad/rotor friction problem.

Even manual brakes should be capable of locking the front rotors, no problem.
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Old 05-03-2019, 03:59 PM
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Quote:
Originally Posted by tools View Post
The way the pedal is if I drill a hole lower, the clevis on the brake booster shaft will push it slightly up into the booster diaphragm . Right now it is straight and the pedal feel is good. By moving the hole lower to get the 4.5:1 ratio will I be getting a longer travel on the brake push rod ?
Yes you will and getting longer travel inside your m/c which will give you better stopping force.
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Old 05-03-2019, 06:33 PM
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Yes you will and getting longer travel inside your m/c which will give you better stopping force.

And it will be harder to push the pedal.
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Old 05-03-2019, 06:44 PM
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Quote:
Originally Posted by RWENUTS View Post
Yes you will and getting longer travel inside your m/c which will give you better stopping force.
The only way this would actually matter is if the pedal is hitting the floor before the master cylinder if fully stroked.

If he can fully depress the pedal, without the pedal hitting the floor, and not lock up the front rotors the pedal ratio is not the problem.
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Old 05-03-2019, 06:46 PM
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And it will be harder to push the pedal.
Thatís what the booster is for.
Reduces that needed action.
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Old 05-03-2019, 06:48 PM
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Originally Posted by ericnova72 View Post
The only way this would actually matter is if the pedal is hitting the floor before the master cylinder if fully stroked.

If he can fully depress the pedal, without the pedal hitting the floor, and not lock up the front rotors the pedal ratio is not the problem.
Perhaps, but 20 minutes with a drill will decide that.
Maybe he needs some residual check valves.
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