P10 Rear Brake Cylinder

[DSchreiner83]

Hi All -- I've been scouring the internet, but can't seem to come up with a rear brake cylinder rebuild kit for a 1940 Plymouth P10.  Napa carries front brake cylinder rebuild kits, but the rear rubber inserts are a little smaller than the front - so the front kit doesn't fit.  Anyone have a lead on where I can find a rebuild kit?

Thanks! 

[Doug&Deb]

Andy Bernbaums, Roberts Motor Parts. Perhaps even Rock Auto 

[TodFitch]

My parts books show that for the P10 two different sets of rear brake cylinders were used based on serial number of the car. Unfortunately, other than original Chrysler part numbers, I don't know anything about the cylinders.

[kencombs]

If your pistons are usable the cups should be available at most any good parts store.  Dorman and others make generic cups in many sizes.  

[dpollo]

A replacement cylinder, non stepped , is WC 17789  ( Raybestos) it  has wide application and works well.   needs only the small bolt holes elongated on the backing plate. It can be used front or rear, all 4 corners.  On the rear you need either the hollow bolt line fitting,  or the adapter used on pilothouse era rear cylinders.

[Sniper]

34 minutes ago, dpollo said:

A replacement cylinder, non stepped , is WC 17789  ( Raybestos) it  has wide application and works well.   needs only the small bolt holes elongated on the backing plate. It can be used front or rear, all 4 corners.  On the rear you need either the hollow bolt line fitting,  or the adapter used on pilothouse era rear cylinders.

 

This is the kind of stuff that makes this forum rock.

[dpollo]

I recently got a 29 Model Q Plymouth and it looks like WC 17789 fits that  too.

[moparfun]

When I redid the brake system on the 54, the best price that I found for the wheel cylinders was at carquest the rears were part # WCA10588 and they were39.50 each and the fronts were 29.50 each. 

[desoto1939]

I have found that a lot of part stores no longer have the rubber inner parts for the wheel cylinders. you have to have them order in the parts.

 

[desoto1939]

Here is some info taken from my EIS brake catalog onthe P10 1940 Plymouth. If you need more help contact me via a PM. Rich Hartung

 

 

 

   

[bacelaw]

On 1/29/2023 at 8:32 PM, dpollo said:

A replacement cylinder, non stepped , is WC 17789  ( Raybestos) it  has wide application and works well.   needs only the small bolt holes elongated on the backing plate. It can be used front or rear, all 4 corners.  On the rear you need either the hollow bolt line fitting,  or the adapter used on pilothouse era rear cylinders.

Amazing..@dpollo do you mean that the backing plate holes need to be drilled? This is the adapter I've used on my '41 on the rear brakes, curious if this is the one everyone uses https://shop.advanceautoparts.com/p/american-grease-stick-co.-brass-adapter-3-8-24-inverted-to-7-16-24-inverted-blf-22c/22190061-p?product_channel=local&store=7989&adtype=pla_with_promotion&product_channel=local&store_code=7989&gclid=Cj0KCQiAofieBhDXARIsAHTTldoS3AjNqrhsGTxL2_0RWuxFFKa9gP8rL2WR6Xi8VCr-jDZ7HdG5YCQaAnKAEALw_wcB&gclsrc=aw.ds

Edited February 5, 2023 by bacelaw

[Sniper]

I think you want Dpollo's input on this, lol.  I know nothing here.

[dpollo]

That certainly looks like what is needed. I did uotknow they were available new.  

[bacelaw]

9 hours ago, dpollo said:

That certainly looks like what is needed. I did uotknow they were available new.  

Do you drill the backing plate to widen the holes to make that wheel cylinder fit, or are you saying the holes/ears on the wheel cylinders need expanding?