Wheel cylinders - 15/16ths ? 7/8th's ? - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 7 (permalink) Old 05-17-2017, 01:04 PM Thread Starter
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Wheel cylinders - 15/16ths ? 7/8th's ?

Im searching and reading lots of different info

Looks like the 15/16th is the stock cylinder and the 7/8th is the "police/taxi" size

Can anyone confirm this ?

This is for a 1963 Galaxie Fastback

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post #2 of 7 (permalink) Old 05-18-2017, 04:04 AM Thread Starter
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Re: Wheel cylinders - 15/16ths ? 7/8th's ?

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post #3 of 7 (permalink) Old 05-18-2017, 07:06 AM
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Re: Wheel cylinders - 15/16ths ? 7/8th's ?

I can't confirm which is the police version, but I can confirm the larger wheel cylinder (or caliper) will apply more pressure to the brakes. In other words the 15/16" bore will give you stronger brakes. The opposite is true for master cylinders, a smaller bore master will give you stronger (more PSI) brakes.

Most Ford wheel cylinders interchange so you can actually use them to dial in your brake bias instead of a proportioning valve if you wanted. The 11/16" wheel cylinder from a mustang and a 1-1/8" wheel cylinder from an f350 dually will swap. If your rear brakes are locking up too soon you can go down a size or two. It takes trial and error but it does work.

I'd guess the police/taxi wheel cylinder is the larger one based off of that, no clue for sure.

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post #4 of 7 (permalink) Old 05-22-2017, 04:55 AM Thread Starter
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Re: Wheel cylinders - 15/16ths ? 7/8th's ?

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Originally Posted by Tim C View Post
I can't confirm which is the police version, but I can confirm the larger wheel cylinder (or caliper) will apply more pressure to the brakes. In other words the 15/16" bore will give you stronger brakes. The opposite is true for master cylinders, a smaller bore master will give you stronger (more PSI) brakes.

Most Ford wheel cylinders interchange so you can actually use them to dial in your brake bias instead of a proportioning valve if you wanted. The 11/16" wheel cylinder from a mustang and a 1-1/8" wheel cylinder from an f350 dually will swap. If your rear brakes are locking up too soon you can go down a size or two. It takes trial and error but it does work.

I'd guess the police/taxi wheel cylinder is the larger one based off of that, no clue for sure.

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Thx Tim !!!

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post #5 of 7 (permalink) Old 05-23-2017, 11:35 AM
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Re: Wheel cylinders - 15/16ths ? 7/8th's ?

My 63 wagon has the same brakes as a police galaxie and uses a 1"master , 7/8" rear and 1 1/8" front on a manual brake system if that helps.
The rear shoes are 11x2.5" and fronts 11x3"

Last edited by pride63; 05-23-2017 at 11:38 AM.
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post #6 of 7 (permalink) Old 05-23-2017, 11:17 PM
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Re: Wheel cylinders - 15/16ths ? 7/8th's ?

Thanks a lot Tim! I was looking around the forum to find answers to a similar situation too. I would like to save up on some finances so I thought of changing to something much smaller. I heard they help greatly in saving mileage. Is this true? And will our engine's condition deteriorate in any way should we change to a different size as compared to the ones that our car was originally fixed with?
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post #7 of 7 (permalink) Old 05-24-2017, 09:18 AM
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Re: Wheel cylinders - 15/16ths ? 7/8th's ?

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Originally Posted by webbrowan View Post
Thanks a lot Tim! I was looking around the forum to find answers to a similar situation too. I would like to save up on some finances so I thought of changing to something much smaller. I heard they help greatly in saving mileage. Is this true? And will our engine's condition deteriorate in any way should we change to a different size as compared to the ones that our car was originally fixed with?
??? How would these brake parts impact engine condition, and/or have an effect on fuel consumption? Are those the questions you are asking?

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