Brake wheel cylinder bore

[Logan Robb]

While compiling a parts list for order, I know I have a leaky brake cylinder as well. 

I note there are two different sizes. If replacing-does the bore size matter as long as they are both the same?

Thanks-Logan

[CHRIS CARLSON]

Logan, I purchased all my brake parts from Kanter auto. wheel cylinders, hardware kits,  brake hoses, and brake shoes. for my Fleetwood sixty Don't throw away your old brake return springs, & hardware because you will want to retain them and reuse some of them because some in the hardware kits are not as good.

[Dennis P. DiBari]

Chris,

     You are so right!  When I rebuilt my entire brake system, I retained all the brake shoe springs for all four wheels.  Albeit I ordered new hardware, they were not all perfect matches.  I'm glad I saved all the springs to mix and match as needed.

Dennis DiBari

[Logan Robb]

This is good advise! 

I purchased complete backing plate sets from Jason some time ago and installed those on my car. I recall keeping the hardware from the old backing plate-Ill have to dig around and find that bag of greasy springs and pins haha!

Do you recall how to determine the bore size of the cylinders? 

Thanks, 

Logan

[Phillip Hill]

Hey Logan

check Rock auto they have good range of parts and good prices and fast delivery even to Australia 

regards

Phil

[Logan Robb]

Phil, 

Thats where I intend to order my parts from. But there are two bore sizes for the fronts. 

1" and 1-3/16" 

1964 CADILLAC SERIES 60 FLEETWOOD 7.0L 429cid V8 Wheel Cylinder | S...

• Centric 13462085, Front Right 1" Bore, $15.41
• Centric 13462084, Front Left 1" Bore, $15.73
• Centric 13462021, Front Left 1-3/16" Bore, $26.79
• Centric 13462022, Front Right 1-3/16" Bore, $26.79

So knowing which ones to purchase is my largest concern at this point. 

[Dennis P. DiBari]

Logan,

     The only true way to ascertain the size of the bore of the wheel cylinder is with a telescoping tool kit and a micrometer.  You can measure the size bore of your present cylinder and then order the new one based upon that.  The telescoping gauge and micrometer would not be all that expensive - they are spring loaded sizes.

Dennis DiBari

[Marty Smith]

Logan , if you take off the wheel cylinder and remove the dust boot a Tape measure will tell you if it is 1 inch or  1 -3/16  you could buy a 1 inch wooden dowel and compare too,  Pretty sure it is the larger cylinder though. Or a digital caliper will do the job too 

[Logan Robb]

Is there really a difference? As long as I put both the same on each side, would it matter? 

[SK]

Hi Logan

According to the shop manual, the front cylinders have a larger bore (1-3/16”) compared to the rear cylinders (1”).

This makes sense, as the front brakes play a larger role in stopping the car.

Additionally, RockAuto sells 1-3/16” bore cylinders for the front and 1” bore cylinders for the rear.

-Samu