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Old 03-31-2015, 03:52 AM   #1
pacman1967
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Master Cylinder Question

My 85 c10 brakes are real soft. I believe the problem lies in my master cylinder and brake booster. I am running a pretty aggressive cam and also a supercharger so I do not believe I am creating enough vacuum in the motor for the brake booster to work properly. I would really like to switch to a manual brake set up. Can I just use a master cylinder set up from like a 75 c10? Has anybody done this or know why it would be a bad idea?
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Old 03-31-2015, 07:02 AM   #2
andrewmp6
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Re: Master Cylinder Question

If you got a vacuum gauge see if you have 18 or higher if not go manual or install a vacuum pump on it.
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Old 03-31-2015, 07:22 AM   #3
Keith Seymore
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Re: Master Cylinder Question

Seems like if you were not getting enough vacuum then the pedal would be hard, not soft.

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Old 04-01-2015, 01:23 AM   #4
andrewmp6
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Re: Master Cylinder Question

Yeah keith has a point if the pedal is soft you got air in the lines or your master cylinder is toast.
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