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Brake Master cylinder [message #355463]

Sun, 07 June 2020 12:53

6cuda6

Messages: 975
Registered: June 2019

Karma: -6

Senior Member

Ok guys...need your expertise...i need to replace the brake master....i'm still stock. Whats the best one to install? {i know there is a Bendix one, a Dorman one etc]

Rich Mondor, Brockville, ON 77 Hughes 2600

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Re: Brake Master cylinder [message #355467 is a reply to message #355463]

Sun, 07 June 2020 13:46

lqqkatjon

Messages: 2324
Registered: October 2010
Location: St. Cloud, MN

Karma: 5

Senior Member

Just installed a dorman one last week in a gmc. Fit perfectly and the casting was NOT too thick.

I had went in and asked for a “centric” as billy recently installed:

https://www.amazon.com/Centric-Parts-130-66008-Master-Cylinder/dp/B000C0340G?fbclid=IwAR0iEdPS7DqV5se12dE7SPNZFjkx_Dsaf9KJQ7hCn6s9rwm2YnHUhtbT9I4

But locally was not available and they had the Dorman one in stock.

Jon Roche 75 palm beach EBL EFI, manny headers, Micro Level, rebuilt most of coach now. St. Cloud, MN http://lqqkatjon.blogspot.com/

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Re: [GMCnet] Brake Master cylinder [message #355469 is a reply to message #355467]

Sun, 07 June 2020 14:22

Emery Stora

Messages: 959
Registered: January 2011

Karma: 4

Senior Member

Either of those will do. Just measure the thickness of the bolt flanges. If the new ones are thicker it will require a longer push rod. If thinner you’ll need a shorter push rod.

Emery Stora

> On Jun 7, 2020, at 12:47 PM, Jon Roche via Gmclist wrote:
>
> Just installed a dorman one last week in a gmc. Fit perfectly and the casting was NOT too thick.
>
>
> I had went in and asked for a “centric” as billy recently installed:
>
> https://www.amazon.com/Centric-Parts-130-66008-Master-Cylinder/dp/B000C0340G?fbclid=IwAR0iEdPS7DqV5se12dE7SPNZFjkx_Dsaf9KJQ7hCn6s9rwm2YnHUhtbT9I4
>
> But locally was not available and they had the Dorman one in stock.
>
>
> --
> Jon Roche
> 75 palm beach
> EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
> St. Cloud, MN
> http://lqqkatjon.blogspot.com/
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

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Re: [GMCnet] Brake Master cylinder [message #355472 is a reply to message #355469]

Sun, 07 June 2020 15:54

6cuda6

Messages: 975
Registered: June 2019

Karma: -6

Senior Member

Emery as you saying they can be cast with the mounting side having move depth to the cylinder? Were not talking the total thickness of the mounting boss just being thicker meaning the studs in the booster are to short.....

Emery Stora wrote on Sun, 07 June 2020 15:22

Either of those will do. Just measure the thickness of the bolt flanges. If the new ones are thicker it will require a longer push rod. If thinner you’ll need a shorter push rod.

Emery Stora

> On Jun 7, 2020, at 12:47 PM, Jon Roche via Gmclist wrote:
>
> Just installed a dorman one last week in a gmc. Fit perfectly and the casting was NOT too thick.
>
>
> I had went in and asked for a “centric” as billy recently installed:
>
> https://www.amazon.com/Centric-Parts-130-66008-Master-Cylinder/dp/B000C0340G?fbclid=IwAR0iEdPS7DqV5se12dE7SPNZFjkx_Dsaf9KJQ7hCn6s9rwm2YnHUhtbT9I4
>
> But locally was not available and they had the Dorman one in stock.
>
>
> --
> Jon Roche
> 75 palm beach
> EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
> St. Cloud, MN
> http://lqqkatjon.blogspot.com/
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

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Rich Mondor, Brockville, ON 77 Hughes 2600

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Re: Brake Master cylinder [message #355482 is a reply to message #355463]

Mon, 08 June 2020 00:24

Green machine

Messages: 184
Registered: July 2019
Location: North Vancouver BC

Karma: 5

Senior Member

https://www.amazon.ca/gp/product/B000C9E9NI/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

There ya go. Cheap and a perfect replacement just did mine a few months ago. Good luck.

Shawn

Shawn Harris North Vancouver, Canada 1977 Palm Beach 403

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Re: Brake Master cylinder [message #355483 is a reply to message #355482]

Mon, 08 June 2020 06:09

6cuda6

Messages: 975
Registered: June 2019

Karma: -6

Senior Member

Thanks Shawn....hopefully NAPA has one locally, if not its going to be that one.....although Amazon shipping date guaranty has become very sketchy of late Mad

Green machine wrote on Mon, 08 June 2020 01:24

https://www.amazon.ca/gp/product/B000C9E9NI/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

There ya go. Cheap and a perfect replacement just did mine a few months ago. Good luck.

Shawn

Rich Mondor, Brockville, ON 77 Hughes 2600

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Re: Brake Master cylinder [message #355493 is a reply to message #355483]

Mon, 08 June 2020 10:04

Green machine

Messages: 184
Registered: July 2019
Location: North Vancouver BC

Karma: 5

Senior Member

I buy a ton from amazon. I have found them to still be pretty accurate with dates. Especially if you are a prime member, which I am. Good luck!

Shawn

Shawn Harris North Vancouver, Canada 1977 Palm Beach 403

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Re: Brake Master cylinder [message #355498 is a reply to message #355493]

Mon, 08 June 2020 11:58

6cuda6

Messages: 975
Registered: June 2019

Karma: -6

Senior Member

The trick lately is they want you to buy it then they will email you a delivery date or the delivery date is 6 to 14 business days even if you have prime.....always seems to be things they may have to bring up from the US warehouse or something. As it is its taking 3 to 5 days to get something from Toronto to my house (i can drive there in 3.5hrs)

Green machine wrote on Mon, 08 June 2020 11:04

I buy a ton from amazon. I have found them to still be pretty accurate with dates. Especially if you are a prime member, which I am. Good luck!

Shawn

Rich Mondor, Brockville, ON 77 Hughes 2600

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Re: Brake Master cylinder [message #355501 is a reply to message #355463]

Mon, 08 June 2020 12:36

Green machine

Messages: 184
Registered: July 2019
Location: North Vancouver BC

Karma: 5

Senior Member

Interesting. We are having very different experiences with them I guess. Maybe they like the West Coasters better Smile

Shawn Harris North Vancouver, Canada 1977 Palm Beach 403

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Re: Brake Master cylinder [message #355540 is a reply to message #355463]

Wed, 10 June 2020 07:26

Michael Leipold

Messages: 318
Registered: April 2011
Location: Greensboro NC

Karma: 2

Senior Member

I am East Coast, the shipping dates provided when I check out are rarely 2 day anymore, but my packages almost always arrive before the estimated date.

1973 GMC 26' Glacier - Unknown Mileage - Has a new switch pitch transmission with Powerdrive Smile

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Re: Brake Master cylinder [message #355556 is a reply to message #355540]

Wed, 10 June 2020 11:34

6cuda6

Messages: 975
Registered: June 2019

Karma: -6

Senior Member

I wish....although they have started to deliver on saturdays and sundays so maybe things a looking up.

Michael Leipold wrote on Wed, 10 June 2020 08:26

I am East Coast, the shipping dates provided when I check out are rarely 2 day anymore, but my packages almost always arrive before the estimated date.

Rich Mondor, Brockville, ON 77 Hughes 2600

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Re: [GMCnet] Brake Master cylinder [message #369865 is a reply to message #355469]

Sun, 05 June 2022 09:06

blur911

Messages: 166
Registered: December 2020
Location: Kingston, Ontario

Karma: 4

Senior Member

Emery Stora wrote on Sun, 07 June 2020 14:22

Either of those will do. Just measure the thickness of the bolt flanges. If the new ones are thicker it will require a longer push rod. If thinner you’ll need a shorter push rod.

Emery Stora

What are the symptoms if the wrong pushrod length/flange thickness happens?
Roxie's previous owner replaced the MC, but never drove it, the brakes are awful.

This looks like it might be as thick as they come?

https://i.postimg.cc/c4zCmmD5/IMG-20220605-095958180.jpg

Burl Vibert
Kingston, Ontario
1976 GMC 26 foot, Sheridan reno, don't know original model but we call her Roxie

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Re: Brake Master cylinder [message #369871 is a reply to message #355463]

Sun, 05 June 2022 17:16

tphipps

Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL

Karma: 9

Senior Member

When I replaced the master cylinder on my GMC, I had a friend who was a very experienced tool and die maker machine the extra thickness off the new master cylinder.
Tom

2012 Phoenix Cruiser model 2552 KA4CSG

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Re: Brake Master cylinder [message #370006 is a reply to message #355463]

Wed, 22 June 2022 15:02

blur911

Messages: 166
Registered: December 2020
Location: Kingston, Ontario

Karma: 4

Senior Member

I took off the MC and I'm bench bleeding it, the front circuit now seems to move fluid as I push the plunger, but the rear one, (to the front brakes), only seems to start moving fluid after I push it in about 1/2". Is this normal?

There did seem to be some air in the MC, so I'll put it on and give it a try later.

Burl Vibert
Kingston, Ontario
1976 GMC 26 foot, Sheridan reno, don't know original model but we call her Roxie

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Re: Brake Master cylinder [message #370007 is a reply to message #355463]

Wed, 22 June 2022 21:32

RF_Burns

Messages: 2276
Registered: June 2008
Location: S. Ontario, Canada

Karma: 3

Senior Member

My understanding from Dave Lenzi is the mounting flange is generally thicker than OEM which means the mounting studs are too short to fully perturb through the mounting nuts. Dave mills the back side of the flag so a full thread engagement with the nut is possible. That being said, you also need to check the pushrod length as that seems to be variable as well.

I got a Master cylinder from DaveL with the flange already milled to spec.

Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

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Re: Brake Master cylinder [message #370008 is a reply to message #355463]

Thu, 23 June 2022 11:58

Russell K.

Messages: 178
Registered: October 2016
Location: Dunedin, Florida

Karma: 4

Senior Member

No Message Body

[Updated on: Thu, 23 June 2022 12:00]

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