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Manual disk brakes????


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My 72 Mach has front disks but they are manual brakes.  I thought all disk brake setups were power from the factory??  Did someone do a disk conversion on my car at some point and leave them as manual??

Thanks!

Wade

1972 Mach 1 351 cj 4speed

"We confide in our strength, without boasting of it; we respect that of others, without fearing it."--Thomas Jefferson

 

 

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I would say so. Don't think standard reservoir will give you enough pressure to clamp a disc brake caliper.

BKDunha

72 Mach 1 H-Code (Concourse driven restoration)

67 S-Code Factory GT with 4-Spd

68 Mercury Cyclone (Pro-Street project)

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The manual brake master cylinder is I think 1" in dia. and the PDB is 15/16". You get the power from the booster not the cylinder.

I have driven my car all year with a blown booster just takes a little longer to stop. Headed to booster Dewey soon. Neck will not let me do much.

BTW brake pedal is different, proportioning valve, and I think master cylinder is positioned different on the firewall. If they put the calipers on they changed the spindles also. I have several PDB cars if you need to come look or need some parts.

When a man is in the woods and talks and no women are there is he still wrong??:P

David

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I would say so.  Don't think standard reservoir will give you enough pressure to clamp a disc brake caliper.

 

Manual drum master cylinder will give you enough pressure.  I have same setup on my car. Originally came with manual drum brakes and I swapped out for disc in front and back. Runs both fine. But I do have all the parts to convert it to power.  All newly rebuilt, just gotta get time to put them on.

Kevin
1971 Mach 1

408C Stroker - C4 w/3,000 stall - 8.8" Rear w/3.73's - Disc brakes all way around.

 

 

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Everyday is an opportunity to learn. I agree that disc brakes will work without booster as I have also blown booster diaphragms. Just not at all comfortable with the distance needed to stop without booster. Understandably the booster is one component of several specifically to be utilized with PDB setup. I can vouch for Booster Dewey. He has done 3 boosters for me and all worked and looked great after his services.

BKDunha

72 Mach 1 H-Code (Concourse driven restoration)

67 S-Code Factory GT with 4-Spd

68 Mercury Cyclone (Pro-Street project)

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My 72 Mach has front disks but they are manual brakes.  I thought all disk brake setups were power from the factory??  Did someone do a disk conversion on my car at some point and leave them as manual??

 

My car came with manual front disc brakes and drum brakes in the rear. It now has four wheel manual disc brakes and has absolutely no issues stopping. I have a Wilwood MC and NO proportioning valve.

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So bottom line my car would not have come with manual brakes\no booster if it has front disks?  Is it possible that someone pulled the booster because it went bad and then just stuck a manual master cylinder back on it or is it more likely that they did a front disk brake conversion?

Thanks!

Wade

1972 Mach 1 351 cj 4speed

"We confide in our strength, without boasting of it; we respect that of others, without fearing it."--Thomas Jefferson

 

 

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DO you have a marti report? It will tell you what it came with

73 Grande H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

 

- Jason

 

 

082-hot-rod-power-tour-2017-1970-1970s.jpg

 

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