| Re: [GMCnet] Different models of P-30 master cylinders? [message #248383 is a reply to message #248379] |
Thu, 24 April 2014 16:11   |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma:
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Senior Member |
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Read here
http://www.machinesoflovinggrace.net/gmc/brakes/MasterCylinders.html
Erf
On Thursday, April 24, 2014, Tom Whitton <tomwhitton@bellsouth.net> wrote:
> Does anyone know if the following sent to me several years ago is still
> true? Are there still three different models of P-30 master cylinders and,
> the main reason for my question, do they all take the same length pushrod?
> There is quite a bit of travel on my brake pedal before the brakes engage
> and I want to reduce the travel if possible. The brakes are new and the
> rear drum shoes are adjusted tight. My brakes are excellent but I don't
> like the travel.
>
> (I think Emery Stora might have written this):
>
> "The are three different P-30 master cylinders. Two of them have a 1 1/4"
> bore and one has a 1 5/16" bore. I used the one with the 1 5/16" bore
> which is for a 1972-76 Chevrolet P-30 chassis which has 15" drums and 4"
> wide brake shoes. Carquest 20-1583 (rebuilt) or E84058 $122.43 (new).
> Price from year 2000. This one has about 10% more volume (or 10% less
> stroke for the same volume than the 1 1/4" bore on the other P-30 models.
>
> It will be necessary to make a pushrod that is 3 11/16" long. Use a steel
> rod of the same diameter as the original and round the end on a grinding
> wheel or adjustable pushrods can be purchased.
>
> Since the master cylinder is longer than the original it may be necessary
> to grind a reinforcing rib on the inside of the front fiberglass door the
> clear the bail on the master cylinder or washers can be placed between the
> hinge and the door to make the difference."
>
> I made my pushrod 3 11/16" long as suggested. I don't want to unbolt
> everything, including the vacuum pump and connections if there isn't a
> possibility of reducing the pedal travel. I will appreciate your thoughts.
>
> Thanks,
>
> Tom Whitton
> 26 foot updated GMC
> Paducah, KY
>
>
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--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
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