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  #1  
Old 07-30-2022, 05:55 PM
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Default MASTER CYLINDER NEEDED

Many years ago I took the power booster off my 69 GTO and I believe I put a MC on it that was for Disc brakes without power. Where can I find one ?
Won't make Norwalk otherwise. OGR

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  #2  
Old 07-30-2022, 06:44 PM
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Replacement boosters have 2 rods with them. You should be all set for almost any 69 GM car.
Ames has em.

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Old 07-30-2022, 06:53 PM
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I guess my question wasn't clear ? I need a master cylinder for disc brakes, but no power brakes.

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1st time on a dragstrip, 1964. Flagstart !

"Thanks for the entertainment."

"Real Indians Don't Wear Bowties"
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Old 07-30-2022, 07:01 PM
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It's been little over 20 years, but the last oem master/manual disc setup I put together for a '68-72 GTO I used a rebuilt manual disc master for a '68 Chevelle manual disc car. I'd bet not something one can order any more at local O'Reillys.

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Old 07-30-2022, 07:13 PM
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Maybe this will help. You need a 1" bore master for manual disc brakes.
https://www.chevelles.com/threads/wh...linder.247363/

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Old 07-30-2022, 07:15 PM
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https://www.oreillyauto.com/shop/b/b...aster+cylinder

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Old 07-30-2022, 09:09 PM
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I have an original from a '71 Formula. I am sure it would need to be checked out, gone through though.
Manual disc brake, the tall style Master Cylinder.

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Old 07-30-2022, 09:13 PM
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I believe the MBM MC309 will work for you.

https://mbmbrakes.com/mc309-gm-1967-...ster-cylinder/

MBM description:

GM 1967-1977 Cast Iron with Bleeders

1-1/8" Bore; Deep Hole
9/16" & 1/2" Ports on Left Side with Bleeder Valves
Licensed GM Restoration Part
Exact Copy of Original w/ casting number 5468309


There are a few on line vendors.

Be aware that there will not be a residual valve for the rear drums in this MC. They do recommend the use of an inline residual valve but it is not absolutely necessary and say to use one at your discretion.

I am not sure of the 69 models but according to the 68 service manual all models used a 1-1/8" MC with Disc Brakes

Also, Tuff Stuff Performance has a selection of MCs 1" or 1-1/8" bores with deep or shallow piston holes.

https://www.tuffstuffperformance.com...cylinders.html

Dave

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  #9  
Old 07-31-2022, 09:10 AM
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I used the Right Stuff on my 72.

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Old 07-31-2022, 09:57 PM
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Do you have 4 wheel disc brakes or front disc, rear drum?

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  #11  
Old 08-01-2022, 11:37 AM
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Quote:
Originally Posted by fyrffytr1 View Post
Do you have 4 wheel disc brakes or front disc, rear drum?
FD RD

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3 Generations of "Beach Boys Racing" !

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1st time on a dragstrip, 1964. Flagstart !

"Thanks for the entertainment."

"Real Indians Don't Wear Bowties"
  #12  
Old 08-01-2022, 02:50 PM
gto4ben gto4ben is offline
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These may help in your search.
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Name:	68-70 Master Cylinder Usage.jpg
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  #13  
Old 08-04-2022, 06:40 PM
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Found a MC at auto zone, NM1489. Doesn't look original but installed it does have a firm brake pedal.
Off to Norwalk !

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3 Generations of "Beach Boys Racing" !

Everybody knows somthin.
Nobody knows everything !


1st time on a dragstrip, 1964. Flagstart !

"Thanks for the entertainment."

"Real Indians Don't Wear Bowties"
  #14  
Old 08-05-2022, 04:14 PM
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Quote:
Originally Posted by Old Goat Racer View Post
Found a MC at auto zone, NM1489. Doesn't look original but installed it does have a firm brake pedal.
Off to Norwalk !
Old Goat Racer,

Great that you found one local.

Just for my future reference, did this MC have the residual valve in the rear port?


Thanks,


Dave

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  #15  
Old 08-06-2022, 02:52 PM
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Quote:
Originally Posted by dmorg1 View Post
Old Goat Racer,

Great that you found one local.

Just for my future reference, did this MC have the residual valve in the rear port?


Thanks,


Dave
Sorry, but I don't know that answer.

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3 Generations of "Beach Boys Racing" !

Everybody knows somthin.
Nobody knows everything !


1st time on a dragstrip, 1964. Flagstart !

"Thanks for the entertainment."

"Real Indians Don't Wear Bowties"
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