wheel cylinders for blitz
 

I have a little problem with my wheel cylinders on my 4x4 ford blitz the pistons are seized in the cylinder does anyone have an idea how to free them as i have tried soaking them in deisel for 3 weeks. Failing this does anyone know where i can get some new ones in Australia, I am going to the west coast U.S in december.

Cheers
Macca.

Wheel cylinders
 

Probably the best way to go is to take them to a competent brake place which will press them out and resleeve the cylinders in stainless steel. This is a good long-term solution which I (and many others) have done to blitzes.
On 3 ton cab 13 models all wheel cylinders are the same whilst if yours is a F15A the fronts are smaller.
You should also consider doing the master cylinder while you're at it. It's in an awkward place and you'll curse getting it out particularly if you have a brake booster.
It's also a good time to have a careful look at the other parts of the system like the lines (which can rust) and hoses.

Cylinder boots
 

The problem with reconditioning wheel cylinders in Aust is that the boots for the cylinder ends are no longer made by PBR and are getting near impossible to find still on shelves. The part number is PBR 5976, good luck! Cups in 1 3/8 and 1 1/2 are still available though. Stainless sleeving is definately the way to go for avoiding problems down the track.

New production complete wheel cylinders and repair kits are available from the states from www.macsautoparts.com .
Part numbers are the same as the original Ford numbers. (By the way, Ford and Chev CMPs use the same Ford wheel cylinders, but master cylinders are particular to Ford or Chev)

Stuck cylinders
 

The best way of removing stuck pistons in the wheel cylinders is by hydraulic pressure.

I just use a grease nipple screwed in the bleed screw hole , plug up the hose hole with a appropriate bolt of the same thread .

Use a grease gun and pump grease into the cylinder , it will push out the stuck cylinders easily . It works every time .

Mike

Stuck pistons
 

Good one Mike

never thought of doing that, I'll stash that tip away in my little black book

Pete

Brakes
 

While we are talking Blitz brakes, does anyone know what thread the pipe nuts are, that go into the master cylinder banjo. They are finer than NF, I seem to think they are an API thread. Maybe someone in UK may know where to obtain them?

Richard

Threads
 

Hi Richard

I seem to remember I used 3/8" male unions that fit Dodge, GMC, etc, in which case it would make then American fine and you should be able to pick them up via one of the dealers in this country, some one like Tony Sudds or Jeep parts

Pete

Re: Threads
 

Pete,

Thanks for that, I had a feeling the Jeep used a similar thread form.

Richard

brake bits
 

Hi

The braking system flexi's are also GMC parts and easy to get hold of.

Kind regards

Nick

brake lines
 

Nick’s right

that's what the Oxford crew use on our wagons, nice and easy to get hold of.
I have a whole load of original rear flexi brake hoses that look in A1 condition still in the Cosmoline, we don't use them however there are limits to originality over safety !

Pete

Part Numbers
 

During the restoration of my 1941 F15A 12 cab, I replaced all the brake components. All parts had to be researched and located, these numbers represent current replacement parts which are exact fit as original. Please share these amongst the cmp community at will... I wish I had them in the beginning.

Wheel Cylinders front Raybestos WC4571
rear Raybestos WC4511

Master cylinder EIS EH572

Brakes Hoses front (2 req'd) Raybestos BH5931
front (1 req'd) Raybestos BH25629
rear (1 req'd) Raybestos BH31669

I have also been asked by many cmp'ers regarding other numbers which I still have (someplace!) and will post when I find them.
A note to many, Ford and Chevrolet utilized many civvy parts during the war from whatever was already on the shelf or previously engineered. Finding these old parts is not as difficult as manty believe. A starting point for sourcing is to compare civilian vehicles of the same era, either pre or post-war that would utilize the same engine, brakes etc.
The numbers for the Ford brakes were listed under 1949 to '56 3 ton commercial truck, just to give you an idea.
Many parts jobbers have catalogs with pictures and dimensions to guide a person in the right direction.
Hope this helps some of you fellows out.

:p

Brake parts numbers....
 

Thanks for the numbers Chris

I was not aware that wheel cylinders were the same on Fords and Chevs....... if so that means you Frod number are good for my C15........

... I will make sure that I remove one of my own to verify.... as I have already found some unusual features on the early Cab 11 that are not typical of the Cab 13...... I always wondered what were the small shock absorbers On the Cab 11... by chance while reviewing a part manual on a CD sent to me by one of ouor Aussie friends... I was able to ID the shock as an early Delco and also used on a the early 1940 1/2 ton military Dodge power wagon ...... what a coincidence.

I have asked this before to the adminstrators..... it would be very beneficial to create a new section ONLY for parts numbers... on a similar Dodge Power wagon site they maintain an extensive crossed referenced section for old parts to modern repro or over the counter parts.......

I know I have shared brake line numbers... and recently discovered a fuel gauge sender that will bolt on a CMP fuel tank... almsot exact same five screw star bolting pattern...... and I got it from Princess Auto parts..... probably from China..... Once I get mine properly fitted I will post all the details...

Keep on trucking.....

Re: Brake parts numbers....
 

Bob, I've started a new thread, "Modern part numbers for CMPs".
Let's see what people are able to dish up, we'll worry about the format later.

H.

Re: brake bits
 

...and fit both Chevrolet as well as Ford? Which ones do I need for my F15A?

Thanks,
Hanno

Flexies
 

Hanno

GMC will fit Ford as well

Pete

brakes
 

I may be deliving way to far into the past here... but aren't the master cylinder repair kits also interchangable? got a vague I dea that Wally Wheatley told me that years ago....

kind regards

Nick

Re: Flexies
 

Thanks Pete!

Cylinders
 

Little bit of information gained today............Split axel GMC front wheel cylinders are exactly the same as CMP 1 3/8" with rubber dust caps.

Never to old to learn a new trick

Pete;)