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Old 01-11-2012, 02:22 PM
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need advice ,,brake problem

i have a 38 chevy m 2 dr sedan, I have a 7''dual diaphram power booster , with a 1'' bore MC, cowl monted. The disc brakes are TCI kit camaro, the rear are common 10 bolt drums. I lengthened an S 10 pedal. The brakes seem fine if I am driving and not stomping them. The car slows like my daily driver does. It stops Ok if i drive normal, a light brake to stopping. If I want to stop fast, no way. I can't lock up the wheels except on gravel or sand. The car just will not stop fast. What am I missing or lacking?

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Old 01-11-2012, 02:54 PM
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Brakes

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Originally Posted by TheCiscoKid
i have a 38 chevy m 2 dr sedan, I have a 7''dual diaphram power booster , with a 1'' bore MC, cowl monted. The disc brakes are TCI kit camaro, the rear are common 10 bolt drums. I lengthened an S 10 pedal. The brakes seem fine if I am driving and not stomping them. The car slows like my daily driver does. It stops Ok if i drive normal, a light brake to stopping. If I want to stop fast, no way. I can't lock up the wheels except on gravel or sand. The car just will not stop fast. What am I missing or lacking?
I have always used a bigger bore mc on my cars and have no trouble. do you have a leak anywhere, do you have a p-valve on it and is it set right.

Do you have a mc that is for disc, drum setup.

Bob
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Old 01-11-2012, 03:08 PM
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I think the M.C. is too small, but I'm no expert

anyone else have any info?
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Old 01-11-2012, 04:56 PM
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Brakes

Quote:
Originally Posted by TheCiscoKid
i have a 38 chevy m 2 dr sedan, I have a 7''dual diaphram power booster , with a 1'' bore MC, cowl monted. The disc brakes are TCI kit camaro, the rear are common 10 bolt drums. I lengthened an S 10 pedal. The brakes seem fine if I am driving and not stomping them. The car slows like my daily driver does. It stops Ok if i drive normal, a light brake to stopping. If I want to stop fast, no way. I can't lock up the wheels except on gravel or sand. The car just will not stop fast. What am I missing or lacking?
I have always used a bigger bore mc on my cars and have no trouble. do you have a leak anywhere, do you have a p-valve on it and is it set right.

Do you have a mc that is for disc, drum setup.

Bob
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Old 01-11-2012, 08:25 PM
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Visit MP Brakes here http://www.mpbrakes.com/technical-su...-cylinders.cfm and scroll down to brake pedal ratios and see if your extenede pedal com plies.
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Old 01-12-2012, 12:40 PM
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How did my post get on there twice, it wasn't there when Matt posted.

Bob
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Old 01-13-2012, 12:03 AM
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did you come up with anything?
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Old 01-13-2012, 08:39 AM
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Quote:
Originally Posted by TheCiscoKid
i have a 38 chevy m 2 dr sedan, I have a 7''dual diaphram power booster , with a 1'' bore MC, cowl monted. The disc brakes are TCI kit camaro, the rear are common 10 bolt drums. I lengthened an S 10 pedal. The brakes seem fine if I am driving and not stomping them. The car slows like my daily driver does. It stops Ok if i drive normal, a light brake to stopping. If I want to stop fast, no way. I can't lock up the wheels except on gravel or sand. The car just will not stop fast. What am I missing or lacking?
The 7"dual diaphragm aftermarket booster needs a 1 1/8" bore master cylinder and the pedal ratio should be around 4:1 to function well.

Lengthening your brake pedal more than likely increased the pedal ratio to one that is greater than the 4:1 needed. This will cause you to 'run out of pedal travel' and thus no brakes.

The 1" bore master cylinder will work best without the power assist and a pedal ratio of 6:1 or 7:1.
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