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Old 07-05-2010, 03:32 PM
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Brake pushrod question

I changed my 63 Impala from a single master cylinder over to a dual master cylinder for safety reasons.
I just looked under the dash and I see have two places to mount the push rod for the master cylinder.
Which hole, should I be in with a dual master cylinder?

Top hole as pictured or bottom hole?


Less travel with top hole and more travel with bottom hole - CORRECT?

More foot pressure with top hole or less foot pressure with top hole?

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Old 07-05-2010, 03:44 PM
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I don't think that makes a difference? I may be wrong... My arms always had one hole. The bottom hole has the brake light switch touching. As far as the pushrod, GM had two sizes and they were determined by whether the master cylinder was for power brakes or manual. One had a shallow nipple for the push rod and the other inset further into the piston.
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Old 07-05-2010, 04:43 PM
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Same place the original one was.
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Old 07-05-2010, 04:44 PM
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Upper hole is for manual brakes, lower hole is for power assisted brakes.

Upper hole will be very touchy if used with power brakes, lower hole will be very stiff if used with manual brakes. It's a pedal ratio/mechanical advantage thing, nothing to do with whether you have a single or dual master cylinder.
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Old 07-06-2010, 05:19 AM
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Thanks
Good to know.
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