Polsten Parts master break cylinder

cletrac (RIP) · #1 12-10-09, 23:23

Here's a page out of the manual with a picture of the cylinder.

Grant Bowker · #2 13-10-09, 01:49

The master cylinder looks like the Ford CMP cylinder. If so, it is available as a modern production item from Mac's, Rock Auto and possibly others. If you can give the part number from the manuals this should be possible to confirm. I'm fairly sure that rebuild kits are available too, but check the condition of the bore before rebuilding. There's no point having great guts in a pitted bore.

Davey War Years · #3 13-10-09, 21:40

thanks chaps im near belfast northern ireland
and uncanny enough my aka nickname is mac lol

the bores great it was the aluminuim plunger brokke as we tried to take it apart it was well seased the brakes in the wheels are like new also

just the washers and plunger shot

would you be able to help me source the parts required many thanks

david mccallion

Lynn Eades · #4 14-10-09, 10:22

Your master cylinder should be easy to fix, or get a replacement for. There is probably a casting number on it. Take it to a brake specialist, and they will help you. 1 1/4" bore is a common size. If the bore is ok, you will need a new piston of the correct length a spring, and a kit.

Davey War Years · #5 14-10-09, 23:51

tHANK GUYS BUT IVE SPENT ENDLESS HOURS SEARCHING MAKING PHONE CALLS BUT TO NO AVAIL
EVERY ONE IS TELLING ME IT WILL BE EASY TO SOURCE OR FIND A REBUILD KIT OR A REPLACEMENT

AM I DOING SOMETHING WRONGGGGGGGGGGG

SEE RESTORATION PAGE ON MY WEBSITE

www.waryearsremembered.co.uk

you will see the master brake cylinder

it is a bendix s230 cast on side
the broken plunger is a wagner usa part number fc1550

can someone please help as i was hoping to tow it in the remembrance parade in november

cheers davey

Paul Singleton · #6 15-10-09, 02:36

Does this look like it?

1944 FORD 94T (1-1/2 TON) All Engines : Brake/Wheel Hub : Master Cylinder Price Core Total
RAYBESTOS Part # MC4572 {Professional Grade; Bore Size=1 1/4" Number of Ports=1 Primary Outlet Size=1/2x20}
Manual Brakes

$65.79 $0.00 $65.79

From this site, http://www.rockauto.com/index.php?a=...FQjyDAod7loQjw

Paul

Grant Bowker · #7 15-10-09, 03:24

Although they look similar, I would still like to see confirmation that the Polsten's master cylinder is the same as the Ford CMP master cylinder.

The CMP Ford part number is 91T-2140. According to www.MacsAutoParts.com this was used for 1939-1952 1 and 2 ton trucks. They sell a rebuild kit for the same applications as part 91T-2004-A. The prices are for the master cylinder $69.95 and for the kit $32.00. (Rock Auto lists a rebuild kit for $16.50 for the 1940 Ford 91T truck 1-1/4 inch master cylinder)

The same master cylinder was used on the 2 wheeled CMP 15 and 20 cwt trailers (GS, pole, gas welding etc.)and the 4 wheel trailers for Brake Drum Grinder, 60 ton press, QMG-MT as well as GS.

All in all, it seems a common master cylinder, it looks similar, but before I suggest anyone to go out and buy a kit for anything as critical as brakes I would like to see confirmation that the Polsten manual lists the master cylinder as having part number 91T-2140. If you want to buy a kit on spec, I can't stop you. But if you do, please measure all the parts very carefully to be sure they match what you need. I don't know the weight of the Polsten setup but I'm sure its enough to be a menace if it gets away from you

Davey War Years · #8 15-10-09, 23:22

Quote:

Originally Posted by Paul Singleton

Does this look like it?

1944 FORD 94T (1-1/2 TON) All Engines : Brake/Wheel Hub : Master Cylinder Price Core Total
RAYBESTOS Part # MC4572 {Professional Grade; Bore Size=1 1/4" Number of Ports=1 Primary Outlet Size=1/2x20}
Manual Brakes

$65.79 $0.00 $65.79

From this site, http://www.rockauto.com/index.php?a=...FQjyDAod7loQjw

Paul

many thanks paul appreciated mate