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62 P30 master brake cylinder alternative.
#1356761 Thu Apr 23 2020 05:02 PM
Joined: Mar 2020
Posts: 30
G
Wrench Fetcher
I recently purchased a running 1962 Grumman Olson kurbside,

Mechanically everything seems fine other than a sticky accelerator pump and leaking master brake cylinder.

I'm sure other issues will pop up but for now I want it to be able to stop before it can go.

As far as I have been able the find is this replacement cylinder:

https://www.partsgeek.com/gbproduct...o5klPR2QfZlDLJLnMgbvJQPO5OhoCUPIQAvD_BwE

It's for a 1961 till 66 P30 chassis (I have no confirmation that this is the correct chassis other than that multiple sources have said so) and seems to have the same three bolt pattern. But 133$ is really steep for something that usually around 50/60 bucks. (I understand that demand for these are way low) eventually I would like to overhaul the brake system to something more modern. But due to time constraints I need it mobile buy the end of may 2020.

My question is are there any other Master cylinders that will swap out from perhaps other makes. I see ones listed for Ford from the same era that have what looks to be a similar bolt pattern for a third of the price.

Any knowledge is useful due to the fact that I am very new to all of this.

Attached Files
IMG_20200406_144416644.jpg (269.43 KB, 153 downloads)
IMG_20200406_144402110.jpg (251.44 KB, 151 downloads)

The idiot savant
Re: 62 P30 master brake cylinder alternative.
Grizzlynaut #1356842 Fri Apr 24 2020 01:48 AM
Joined: Nov 2005
Posts: 5,682
3
3B Offline
Master Gabster
Hy Grizzlynaut, welcome, the master cylinder I come up with for a 1/2 ton P series 1960 to 62 is Raybestos part number MC 34403, that is a 1 1/8" bore and uses a two bolt mounting which is offset $42.89 at RockAuto. According to my brake parts catalogue the same master cylinder is used on the C series pickups as well 1960 to 62, hope that helps.

Re: 62 P30 master brake cylinder alternative.
Grizzlynaut #1356846 Fri Apr 24 2020 02:04 AM
Joined: Apr 2005
Posts: 8,788
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
I don’t know if your 1 ton is different than a 1/2 ton but the M/C in the photo looks a lot like the one I removed from my C-10 when I converted to power brakes.


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2)
‘39 Dodge Businessmans Coupe
USAF 1965-69 Weather Observation Tech (got paid to look at the clouds)


"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!

Re: 62 P30 master brake cylinder alternative.
Grizzlynaut #1356925 Fri Apr 24 2020 05:41 PM
Joined: Mar 2020
Posts: 30
G
Wrench Fetcher
Thanks 3B, it really looks like its a 3 bolt. I'll be back out there tomorrow. I could be very wrong on the chassis designation.
There isn't much clear information about these around. I'll look into the c-10 master aswell.


The idiot savant
Re: 62 P30 master brake cylinder alternative.
Grizzlynaut #1356933 Fri Apr 24 2020 06:36 PM
Joined: Mar 2004
Posts: 4,550
M
Shop Shark
Welcome to the Stovebolt wave

Check if there is a casting number on the MC...my book shows 1955-66 D-D as being 1-1/8" dia, cast # 5454736, p/n 5454644.

Is your truck a manual or automatic?

Mike B smile

Re: 62 P30 master brake cylinder alternative.
Grizzlynaut #1356943 Fri Apr 24 2020 08:03 PM
Joined: Nov 2005
Posts: 5,682
3
3B Offline
Master Gabster
Hy Grizzlynaut, I apologize I gave you information for a 1/2 ton P series 1960 - 62, the number I came up with for the one ton is Raybestos part number MC21918 $127,79 at RockAuto. That master cylinder does have a three bolt mounting flange and the GM part number was 5454644 sorry for the incorrect information, I hope this new information helps.

Re: 62 P30 master brake cylinder alternative.
Grizzlynaut #1357106 Sat Apr 25 2020 06:06 PM
Joined: Mar 2020
Posts: 30
G
Wrench Fetcher
I was able to do an Indiana Jones style paper rubbing in the narrow space between the cylinder and the wheel well.
It's indeed a 1-1/8" dia, cast # 5454736. Thanks Mike B and 3B I'll be ordering one shortly smile


The idiot savant
Re: 62 P30 master brake cylinder alternative.
Grizzlynaut #1357442 Mon Apr 27 2020 04:20 PM
Joined: Jun 2004
Posts: 8,202
W
Master Gabster
Have you checked it out for pits. Most of the time you can put a kit in yours.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1956 Chevy 1/2-Ton Pickup

Re: 62 P30 master brake cylinder alternative.
Wrenchbender Ret. #1357490 Mon Apr 27 2020 11:23 PM
Joined: Mar 2020
Posts: 30
G
Wrench Fetcher
I was thinking that this was old enough for a kit but I haven't been able to locate any.


The idiot savant
Re: 62 P30 master brake cylinder alternative.
3B #1357491 Mon Apr 27 2020 11:26 PM
Joined: Mar 2020
Posts: 30
G
Wrench Fetcher
Originally Posted by 3B
Hy Grizzlynaut, I apologize I gave you information for a 1/2 ton P series 1960 - 62, the number I came up with for the one ton is Raybestos part number MC21918 $127,79 at RockAuto. That master cylinder does have a three bolt mounting flange and the GM part number was 5454644 sorry for the incorrect information, I hope this new information helps.


It's a manual smile 4 speed with what feels like a granny 1st


The idiot savant
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