65GS.com - Buick Gran Sport Enthusiasts!
General Discussion => GS Questions => Topic started by: cwmcobra on June 05, 2018, 10:00:52 PM
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Did manual transmission cars with power brakes use a different pedal assembly than those with manual brakes? In my restoration I'm retrofitting power brakes, using the pedal from the original manual brakes and the brake pedal seems way too high off the floor. It's higher than the clutch pedal and seems that it would be awkward to use with the power brakes. Do I need a different brake pedal with the hole for the clevis connection to the vacuum booster in a different position?
Thanks,
Chuck
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Hi Chuck,
No, should be the same. Mine was a no PB car and PB was added, pedals and all else stayed the same.
Mark
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I have done two 1964 conversions from ST300 and power brakes to manual transmissions.
One was a 1964 Special, and the "donor" car was a 1965 Olds F-85 three speed column shift. (in 1978)
The second was a 1965 GS project car parts. (2015)
Both manual pedal assemblies were identical, and the pedal height was the same for the auto pedal, to the manual pedal.
Check to see of you have the push rod adjusted properly and that you have the rubber "pedal up stop" bumper in the top of the mount (steering column/pedal mount).
And you should be pretty close to where it needs to be.
The bumper takes off about one inch of pedal height.
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When you install power brakes, the clevis connects to a different hole on the pedal (lower hole for PB, upper hole for MB), letting the pedal sit closer to the floor. In addition, there are two holes for the brake light switch bracket to mount into, so it has to move to the other hole so that it is aligned with the lower pedal position when you switch to PB. The 65 Chassis service manual shows all this in detail and which holes to use for PB. Also note that there is a return spring on the pedal with manual brakes only; the return spring is omitted when installing PB.