Hydro boost Master cylinder

[ransil]

Anyone using the Dodge 80's MC what size are the brake port fittings??
and does it bolt onto the Astro booster with out having to open up the holes?

 

[TOFIC]

Ask ToddZ he uses the Dodge MC. Got one from him to try in my setup but it did not work in my case. I believe Todd has one the works well with hboost.
how about it Todd?? you got an answer for the Bronco Brother
TOFIC

 

[toddz69]

Anyone using the Dodge 80's MC what size are the brake port fittings??
and does it bolt onto the Astro booster with out having to open up the holes?

1/2-20 and 9/16-20. It'll require some slight work on the holes to bolt onto the Astro pattern.

Todd Z.

 

[ransil]

1/2-20 and 9/16-20. It'll require some slight work on the holes to bolt onto the Astro pattern.

Todd Z.

Is there a better option?
One that bolts on and has 3/16 or something more standard brake line fittings?

and cheap ...

and has good availability at the parts store..

 

[toddz69]

Is there a better option?
One that bolts on and has 3/16 or something more standard brake line fittings?

and cheap ...

and has good availability at the parts store..

77-82 Corvette master is another option that a lot of folks use. Not sure what the fitting sizes are, but they're pretty standard.

Todd Z.

 

[ransil]

77-82 Corvette master is another option that a lot of folks use. Not sure what the fitting sizes are, but they're pretty standard.

Todd Z.

Is that a disc/drum MC??

 

[ransil]

Found the info:

MC39052
GM C3 Corvette Style Master Cylinder
* 1.125” Bore Disc / Disc Spec
* 1/2-20 Front Port – 9/16-18 Rear Port
* 65 / 35 Nominal Front to Rear Output Bias
* May also successfully be used with front disc / rear drum brakes in alternate applications
* 3.400 GM Spec Stud Spacing with 3/8” Bolt Holes
* Features a .250” MC pushrod hole for use with power brake only
* Front Port = Front Brakes / Rear Port = Rear Brakes
* Conventional flare style ports – brake line tube nuts included with MC

 

[toddz69]

Found the info:

MC39052
GM C3 Corvette Style Master Cylinder
* 1.125” Bore Disc / Disc Spec
* 1/2-20 Front Port – 9/16-18 Rear Port
* 65 / 35 Nominal Front to Rear Output Bias
* May also successfully be used with front disc / rear drum brakes in alternate applications
* 3.400 GM Spec Stud Spacing with 3/8” Bolt Holes
* Features a .250” MC pushrod hole for use with power brake only
* Front Port = Front Brakes / Rear Port = Rear Brakes
* Conventional flare style ports – brake line tube nuts included with MC

Randy - also look at the Camaro master cylinder on Paul's site for disc/drum setups too.

Todd Z.

 

[ransil]

Randy - also look at the Camaro master cylinder on Paul's site for disc/drum setups too.

Todd Z.

The Camero is looking like the better option.
This MC comes on just about every Chevy made from the late 60's to 1980.
Cheap too...

MC36306 - 1.125” BORE
GM Camaro Style Master Cylinder
* 1.125” Bore Disc / Drum Spec
* 1/2-20 Front Port – 9/16-18 Rear Port
* 65 / 35 Nominal Front to Rear Output Bias
* Residual pressure valve equipped for use with front disc / rear drum brakes
* 3.400 GM Spec Stud Spacing with 3/8” Bolt Holes
* Features a .250” MC pushrod hole for use with power brake only
* Front Port = Front Brakes / Rear Port = Rear Brakes
* Conventional flare style ports – brake line tube nuts included with MC

 

[cesco]

WOW!! you must be doing that brake upgrade that you have been talking about for a while.

wish i could get some ambition to start working on mine

 

[ken75ranger]

The Camero is looking like the better option.
This MC comes on just about every Chevy made from the late 60's to 1980.
Cheap too...

MC36306 - 1.125” BORE
GM Camaro Style Master Cylinder
* 1.125” Bore Disc / Drum Spec
* 1/2-20 Front Port – 9/16-18 Rear Port
* 65 / 35 Nominal Front to Rear Output Bias
* Residual pressure valve equipped for use with front disc / rear drum brakes
* 3.400 GM Spec Stud Spacing with 3/8” Bolt Holes
* Features a .250” MC pushrod hole for use with power brake only
* Front Port = Front Brakes / Rear Port = Rear Brakes
* Conventional flare style ports – brake line tube nuts included with MC

I run that M/C on the astro booster. It bolts up fine. The plunger lenght is good. I did need an adapter but I had one from an old m/c that did the job.