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Old 08-14-2006, 08:27 PM
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Brake Pressure Multiplier--Do They Work?

I have a 40 ford (327 V8) with discs fronts and drum rears. I have installed a dual diaphram, combination valve and residual valves to both the front and rear brakes. I would like to get a firmer pedal feel with less travel than I currently have. I have heard about BPM's increasing brake pressure and wonder if anyone has installed one on their car and what the result has been. Any help on this would be appreciated.

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Old 08-14-2006, 08:43 PM
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I would preassure bleed the brakes, you may have air.
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Old 08-14-2006, 09:02 PM
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What master cylinder, calipers, wheel cylinders, ect. are you using? Please be specific.
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Old 08-14-2006, 09:35 PM
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Brake Pressure Multiplier---Do They Work?

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I am using a remote fill dual reservoir master with a fifteen-sixteenths bore, GM calipers on 11' rotors, and mustang/granada wheel cylinders on 10' drums.
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Old 08-14-2006, 09:51 PM
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Large calipers right not the smaller "metric" ones?

The 15/16" bore was often matched up with the metric calipers. The larger (take a #52 pad) calipers most often had 1-1/8" masters when used on power brakes.

Is your master cylinder a factory part or aftermarket?

My S10 came stock with a dual-diaphragm booster, 15/16" step bore MC, 10.5" rotor with metric calipers. It now has a 1-1/8" step bore MC, 12" rotors, full size calipers, and the factory dual-diaphragm booster. I have a very firm peddle now. I love it.

How high are your reservoirs located?
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Old 08-14-2006, 09:56 PM
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If you have adequately bled the system of air (pressure bleeding is a great suggestion), and you are confident that there is no more air in the system, the options I can think of that will reduce pedal travel are a larger bore master cylinder, and/or numerically decreasing the pedal ratio, both of which will make for a firmer pedal. Keep in mind that doing this will require more foot pressure on the pedal. I would think you would want to maintain the existing pedal ratio and just make sure the air is out of the system and the pedal travel issues should be better.

I haven't used it, but my understanding of the BPM product is that it only kicks in at high pedal forces, an area of operation that may be seldom used. High pedal forces will still require the use of your system's full pedal travel, so the product used by itself wouldn't do anything to directly address your pedal travel issues.

Your question is interesting in that most folks who ask about pedal firmness issues have the opposite problem - the pedal is too hard with very little travel and they're looking for ways to decrease pedal pressure to achieve the same braking.
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