Looking for power brake booster & master recommendations

[koosh]

For 68 Charger with current power front disc and rear drums, looking for recommendations on a master cylinder & booster with correct pedal linkage….currently has this setup, which leaks from the output ports no matter what i try…

 

[RJRENTON]

For 68 Charger with current power front disc and rear drums, looking for recommendations on a master cylinder & booster with correct pedal linkage….currently has this setup, which leaks from the output ports no matter what i try…View attachment 1854995View attachment 1854996View attachment 1854998

IMO.....the pix shows the master cylinder something like a retro fitted GM design and the booster unit RESEMBLES, but not is a Bendix tandem booster unit. Likely your vehicle would have had a single diaphragm Bendix booster, if originally equipped with drum brakes, and depending on wheel cylinder bore size, a Bendix or Kelsey Hayes master cylinder. Usually the master cylinder was dependent on overall system requirements. Aftermarket retrofitted systems are difficult to state exact size/ brand equipment based on pix information only. Do you know who provided the equipment you now have or its manufacturer........just my thoughts......
BOB RENTON

 

[BeepBeepRR]

I have installed 2 of these on a Road Runner and a GTX they work great and look the part. Those like you have have been nothing but problematic. I have 3 of those style boosters taking up space in my garage.

Info:

Product Description​

New Reproduction Style Mopar Booster Conversion Kit

1966-1970 B Body Mopar Bendix Style Brake Booster Conversion Kit - Bendix type master cylinder for disc/drum and firewall plate/linkage.

Mopar used this type of booster on all of their car lines, except for the A-Body style cars. This booster as the most widely used and top option for both drum and disc brake applications. This kit replaces your booster unit with new parts and will fit Chargers, GTX, Satellites, Cornets, all other B-Body style vehicles made from 1966 to 1970.

This Kit includes:

• Mopar Bendix Style 8" Dual Power Booster w/ Classic Trapezoid Nose!!!

• Black Bendix Logo Style Master Cylinder with 1.125" bore & 9/16"-20 INV & 1/2"-20 INV WITH internal residual valves. Master Cylinder is brand new.

• Firewall Backing Plate with Linkage

This Unit is designed to fit 1966-1970 Mopar B Bodies ONLY with disc front and drum rear brakes.

Brake Lines Exit On Drivers Left Hand Side.
(THIS UNIT WILL NOT FIT CARS THAT HAVE 426 HEMI MOTORS)



Bendix Style Mopar 1966-1970 B Body Power Brake Booster Conversion Kit BCK8536-1 OEM Style for 1966-70 Charger, GTX, Road Runner, Satellite

 

[koosh]

IMO.....the pix shows the master cylinder something like a retro fitted GM design and the booster unit RESEMBLES, but not is a Bendix tandem booster unit. Likely your vehicle would have had a single diaphragm Bendix booster, if originally equipped with drum brakes, and depending on wheel cylinder bore size, a Bendix or Kelsey Hayes master cylinder. Usually the master cylinder was dependent on overall system requirements. Aftermarket retrofitted systems are difficult to state exact size/ brand equipment based on pix information only. Do you know who provided the equipment you now have or its manufacturer........just my thoughts......
BOB RENTON

I was informed a”universal” GM style from Pirate Jacks

 

[BeepBeepRR]

I was informed a”universal” GM style from Pirate Jacks

Probably this one. MP-203 1962-1972 MOPAR A, B, E Body 8" Dual Zinc Booster Conversion Kit w/ Adjustable Proportioning Valve

 

[koosh]

I have installed 2 of these on a Road Runner and a GTX they work great and look the part. Those like you have have been nothing but problematic. I have 3 of those style boosters taking up space in my garage.

Info:

Product Description​

New Reproduction Style Mopar Booster Conversion Kit

1966-1970 B Body Mopar Bendix Style Brake Booster Conversion Kit - Bendix type master cylinder for disc/drum and firewall plate/linkage.

Mopar used this type of booster on all of their car lines, except for the A-Body style cars. This booster as the most widely used and top option for both drum and disc brake applications. This kit replaces your booster unit with new parts and will fit Chargers, GTX, Satellites, Cornets, all other B-Body style vehicles made from 1966 to 1970.

This Kit includes:

• Mopar Bendix Style 8" Dual Power Booster w/ Classic Trapezoid Nose!!!

• Black Bendix Logo Style Master Cylinder with 1.125" bore & 9/16"-20 INV & 1/2"-20 INV WITH internal residual valves. Master Cylinder is brand new.

• Firewall Backing Plate with Linkage

This Unit is designed to fit 1966-1970 Mopar B Bodies ONLY with disc front and drum rear brakes.

Brake Lines Exit On Drivers Left Hand Side.
(THIS UNIT WILL NOT FIT CARS THAT HAVE 426 HEMI MOTORS)



Bendix Style Mopar 1966-1970 B Body Power Brake Booster Conversion Kit BCK8536-1 OEM Style for 1966-70 Charger, GTX, Road Runner, Satellite

View attachment 1855020

I have one recommendation from a supplier who suggests 1 1/32 bore?

 

[koosh]

Probably this one. MP-203 1962-1972 MOPAR A, B, E Body 8" Dual Zinc Booster Conversion Kit w/ Adjustable Proportioning Valve

That’s very close except I don’t have that proportioning valve. I believe mine is built into the distribution block?

 

[BeepBeepRR]

The first one I posted is what I installed on 2 different cars and they work wonderfully. And it bolted right up to the stock pedal. Didn't have to modify anything. I'm not sure but it is the largest bore size. 1.125 which is 1-1/8th

 

[koosh]

How is the bore size determined?

 

[BeepBeepRR]

How is the bore size determined?

Some reading on it...

Effects of Master Cylinder Bore Size on Your Brake System

Follow this guide to learn how the change of bore size on a master cylinder affects a four-wheel disc brake system. View the conversion chart to figure the total bore area for your brake setup.

www.speedwaymotors.com

 

[Sixpactogo]

I used that Pirate Jack Generic Motors MP-203 garbage on my Niece's Challenger when I built it for her. It would not provide enough boost for disc brakes no matter how hard you pushed on the pedal. They wouldn't take it back so it went to a local scrap dealer. You will never be happy with the performance of that booster. Believe Me!
I had to replace it with the Bendix dual 8" unit shown in post #3. It made all the difference in the world so that is what I put on my Charger also since that is the design that Ma Mopar used on these cars. The only issue I had was the rubber boot on the booster is larger in diameter than the factory unit but a couple seconds with a dremel or file takes care of that problem.

 

[The Rebel]

Thanks for posting this as I too have an incorrect disk/drum master cylinder and booster.

I have installed 2 of these on a Road Runner and a GTX they work great and look the part. Those like you have have been nothing but problematic. I have 3 of those style boosters taking up space in my garage.

Info:

Product Description​

New Reproduction Style Mopar Booster Conversion Kit

1966-1970 B Body Mopar Bendix Style Brake Booster Conversion Kit - Bendix type master cylinder for disc/drum and firewall plate/linkage.

Mopar used this type of booster on all of their car lines, except for the A-Body style cars. This booster as the most widely used and top option for both drum and disc brake applications. This kit replaces your booster unit with new parts and will fit Chargers, GTX, Satellites, Cornets, all other B-Body style vehicles made from 1966 to 1970.

This Kit includes:

• Mopar Bendix Style 8" Dual Power Booster w/ Classic Trapezoid Nose!!!

• Black Bendix Logo Style Master Cylinder with 1.125" bore & 9/16"-20 INV & 1/2"-20 INV WITH internal residual valves. Master Cylinder is brand new.

• Firewall Backing Plate with Linkage

This Unit is designed to fit 1966-1970 Mopar B Bodies ONLY with disc front and drum rear brakes.

Brake Lines Exit On Drivers Left Hand Side.
(THIS UNIT WILL NOT FIT CARS THAT HAVE 426 HEMI MOTORS)



Bendix Style Mopar 1966-1970 B Body Power Brake Booster Conversion Kit BCK8536-1 OEM Style for 1966-70 Charger, GTX, Road Runner, Satellite

View attachment 1855020

 

[koosh]

What does “as I took have an incorrect disk/drum master cylinder and booster.”
Mean?

 

[RJRENTON]

I used that Pirate Jack Generic Motors MP-203 garbage on my Niece's Challenger when I built it for her. It would not provide enough boost for disc brakes no matter how hard you pushed on the pedal. They wouldn't take it back so it went to a local scrap dealer. You will never be happy with the performance of that booster. Believe Me!
I had to replace it with the Bendix dual 8" unit shown in post #3. It made all the difference in the world so that is what I put on my Charger also since that is the design that Ma Mopar used on these cars. The only issue I had was the rubber boot on the booster is larger in diameter than the factory unit but a couple seconds with a dremel or file takes care of that problem.

Giving credence to the old expression...."you get what you pay for" and do your own research b4 laying out your cash for unknown components because of an advertisement that proclaim "it'll fit"...........
BOB RENTON

 

[The Rebel]

Oops typo, now fixed.

What does “as I took have an incorrect disk/drum master cylinder and booster.”
Mean?

 

[BeepBeepRR]

I used that Pirate Jack Generic Motors MP-203 garbage on my Niece's Challenger when I built it for her. It would not provide enough boost for disc brakes no matter how hard you pushed on the pedal. They wouldn't take it back so it went to a local scrap dealer. You will never be happy with the performance of that booster. Believe Me!
I had to replace it with the Bendix dual 8" unit shown in post #3. It made all the difference in the world so that is what I put on my Charger also since that is the design that Ma Mopar used on these cars. The only issue I had was the rubber boot on the booster is larger in diameter than the factory unit but a couple seconds with a dremel or file takes care of that problem.

Yes I have had 3 of those gold offset boosters fail. I believe 2 of them were purchased as a Right Stuff kit with the front calipers spindles and hardware.. Those both failed. The third one was in a GTX my friend owns. I don't know who built the car but it was trash too.

This is the right stuff kit.. Junk...

Right Stuff 1962-72 Mopar B/E-Body, 8" Booster, 4-Wheel Power Disc Brake Conversion Kit MDC42DCZ | Moparts

Model 3494988 - Right Stuff 1962-72 Mopar B/E-Body, 8" Booster, 4-Wheel Power Disc Brake Conversion Kit MDC42DCZ - Street Series Kits by The Right Stuff are the most widely used Disc Brake Conversion solution in the Restoration Industry. Stop with confidence using The Right Stuff, leading the...

www.moparts.ca

 

[koosh]

Oops typo, now fixed.

What is wrong with yours?

 

[koosh]

Ok, so far, the “Right Stuff” is junk?
And Pirate Jacks is not? (Except the one i have)
Any other recommendations?
What about the usual Classic Ind?
Jegs? summit?
How about Dr Diffs stuff?

 

[Sixpactogo]

Ok, so far, the “Right Stuff” is junk?
And Pirate Jacks is not? (Except the one i have)
Any other recommendations?
What about the usual Classic Ind?
Jegs? summit?
How about Dr Diffs stuff?

I can't say all the Pirate Jack stuff is junk. Maybe it is ok for a Camaro or some small shivvy but they are no good for a B or E body Mopar.
Cass at Dr. Diff won't steer you wrong and I have no input in the others. I just know that the Bendix style dual 8" diaphragm units I have installed work as they should. The other thing I learned about front disc brakes is that they need two times the boost as drums do and mix matching brake parts are not a good idea.

 

[BeepBeepRR]

Ok, so far, the “Right Stuff” is junk?
And Pirate Jacks is not? (Except the one i have)
Any other recommendations?
What about the usual Classic Ind?
Jegs? summit?
How about Dr Diffs stuff?

Your budget is the limit... You could go full on Wilwood setup but then you have to have huge wheels to clear the huge calipers etc, etc.. Its really a rabbit hole and what works for one is not always what's going to work for the next guy. I just know for a fact the first one I posted works as it should. Ask how many people in this forum use those offset boosters without issue. I'm sure there are several with good reviews. But I have had 3 out of 3 fail. And 2 of them came as a kit which I installed. You wouldn't keep poking the bear after the first time hit bit you. Nor would I and changed up to the Pirate Jack stuff.