[AG]

I'm changing the stock single reservoir master to a dual. Which dual should I get? A '66 or '67, or is some other year a better choice.

[tempest1964]

There are many choices by many aftermarket brake companies and our host as well. If you want a semi-authentic look, this unit on e-bay from inlinetube is a good one for front disc rear drum brakes: http://www.ebay.com/itm/67-69-GM-Fac...lUD0HI&vxp=mtr

[AG]

I'm running 4 wheel drum so I'll need a non-disc MC. Not going with aftermarket just yet, just want the best stock type option.

[Bob with the 66]

Our host sells what you are looking for,

[Keith Seymore]

I used a Cardone 101328 (10-1328).

Application is for a '67 Bonneville.

K

[Dick Boneske]

Dual master cylinders were not offered until 1967. There is no '66 dual.

I chose to add power brakes to my wife's '64, but stuck with the single master cyl. Kept the four-wheel drum brakes. Works very well!

In my 60 years of driving, I've never had a brake failure related to a single master cylinder. We all see many pre-'67 cars at car shows that have been converted to dual master cyl. I just can't understand why people do this. This mod does not improve your stopping distance or pedal effort. Conversion to disc brakes from drum brakes does make sense because discs are more immune to fade and can stop your car in a shorter distance than drum brakes.

Can you enlighten me?

[694.1]

"I just can't understand why people do this."
It was simply the body count. In 62, the Rambler was the first to use the tandem.
While our cars are better maintained and less likely to fail, one rust spot on a line or a burst rubber hose was a real problem back in the day. It was common for people to "pump their brakes" with a failing master just to avoid fixing a life treating repair!
And don't get me started on the "DTV" or Dreaded Treadle Vac.
Those power brake failures killed & maimed untold motorists.
When they fail, they fail catastrophically.
(Never underestimate the value of a good horn & a middle finger!)

[lav]

A leak in a single master system means no brakes...a leak in a dual system means you have at least front or back brakes

[AG]

Originally Posted by Dick Boneske

Dual master cylinders were not offered until 1967. There is no '66 dual.

I chose to add power brakes to my wife's '64, but stuck with the single master cyl. Kept the four-wheel drum brakes. Works very well!

In my 60 years of driving, I've never had a brake failure related to a single master cylinder. We all see many pre-'67 cars at car shows that have been converted to dual master cyl. I just can't understand why people do this. This mod does not improve your stopping distance or pedal effort. Conversion to disc brakes from drum brakes does make sense because discs are more immune to fade and can stop your car in a shorter distance than drum brakes.

Can you enlighten me?

I hear what you are saying, but my daughters will be racing the car down the quarter and it does high 12s. Just want a safety factor for them. Thanks all for the feedback.

[Tom Vaught]

Originally Posted by Dick Boneske

Dual master cylinders were not offered until 1967. There is no '66 dual.

I chose to add power brakes to my wife's '64, but stuck with the single master cyl. Kept the four-wheel drum brakes. Works very well!

In my 60 years of driving, I've never had a brake failure related to a single master cylinder. We all see many pre-'67 cars at car shows that have been converted to dual master cyl. I just can't understand why people do this. This mod does not improve your stopping distance or pedal effort. Conversion to disc brakes from drum brakes does make sense because discs are more immune to fade and can stop your car in a shorter distance than drum brakes.

Can you enlighten me?

I will try to help you out Dick.

As you know a 64 GTO with single master cylinder and metallic drum brakes.

Inspected the brakes yearly and looked at the lines often when under the car for other reasons. Changed the rubber lines once before my "event".

So here I am driving on 8 Mile Road on the east side of Detroit. My future wife is with me.
So that area has several Train Crossings and Barriers (that drop down when a train is coming). So I am doing the speed limit on the road (40 mph).

I am about 150 yards away from the crossing and the barriers start to drop. I push down on my brake pedal and the pedal goes to the floor. No brakes and heading towards a train and other cars around me. I am in the left lane.

So right before the Barriers is a turn around for vehicles that do not want to wait for the train and want to go back the the other way and go up a mile to a different crossing. This turn around is known as doing a Michigan Left turn.
(That crossing had a lot of plant/ "train loading" traffic.)

So I throw the car around the corner in a tight "bootleg turn" and rub up against the median strip (which is raised about 6 inches above the roadway).

Repair was a simple brake line repair (from the junction block to the axle hose. And Later install of a dual master cylinder/related parts.

But My wife and I could have died.

So you have been fortunate with your vehicles and the single master cylinder deal.
I was not. So I have always had a dual cylinder master system from that day on.

Tom V.

[Chris65LeMans]

Originally Posted by Dick Boneske

In my 60 years of driving, I've never had a brake failure related to a single master cylinder.

There's probably a few people who aren't around anymore due to their brake failure.

[GT182]

Dick, like Tom says pray you don't have a brake line go bad. It happened to me too and it scared the living crap out of me. The brake line to the rear broke right under the driver's seat. I only had the emergency brake to stop with. This winter I'm going dual master cylinder and hopefully front discs too.

Not to hijack this thread but it goes along with changing out the master cylinder on front drum brake cars.

Here's a question on disc brake kits. I saw some where online a kit that used the same spindles for a disc brake kit for 64,65, and 66 front drum brake cars. does anyone know and have a link for the website? If I happen find it myself I'll post it here.

[Goatracer1]

AG where in NH are you? I might have a master cylinder for a 1967 that you could have.

[64speed]

GT182 I just did the front disc conversion on my 64 tempest and I initially bought the SSBC brake kit on the advice of the technician from Summit. That kit was junk. Required custom rotors that had to have a spacer, it used something weird like 1990 c1500 brake calipers, it did not come with a prop valve nor did it have the hard metal conversion lines. I called and raised hell after I realized how much trouble it was gonna be and the tech found me a CCP "assembled" kit with everything for less money. Fit like a glove. Well an OJ glove you know how this aftermarket stuff is.

[AG]

Originally Posted by Goatracer1

AG where in NH are you? I might have a master cylinder for a 1967 that you could have.

Goatracer1 I am in Atkinson. I think I met you up NED years ago, you had the '67? with the PS1C Procharger?

[Goatracer1]

I have a house in Newton. Will look this Friday if you are interested. Still have the car but have not been well so don't race anymore.

[pfilean]

I hear what everybody is saying. And I kind of agree with Dick. But I also remember going to work one morning in the left lane and see the line ahead of me stopping suddenly. I stab the pedal and hear a pop as the pedal heads for the floor and I feel little or no braking action. There is a left turn lane beside me and I don't yet know if anyone is in it coming up behind me. But I know I will not stop before I rear end the guy in front of me so on a chance I dive into the left lane (which was empty) and start working the parking (sometimes called emergency) brake to stop before I get to the red light. All this in a vehicle with disc/drum, dual master cylinder and anti-lock. But the rear brakes in these systems are near worthless. The rear shoes can easily last 200,000 miles and still not be worn out while you have changed the front pads 4 times.

Don't get me wrong. I do like the idea of a dual master and have one in my 61. I think it will work better with the discs all around.

As for the other vehicle, I had to have the rotors worked on under warranty. I suspect the tech let the caliper hang from the hose while he worked which may have had something to do with the hose coming apart. I don't remember ever having an emergency problem with a single master cylinder. But I do like the intent of the dual cylinders and will use them.

[AG]

Originally Posted by Goatracer1

I have a house in Newton. Will look this Friday if you are interested. Still have the car but have not been well so don't race anymore.

Yes I'm interested. Let me know what you find.

[Goatracer1]

Email me Friday night at goatracer1@aol.com and I'll let you know.

[Goatracer1]

Couldn't find it Friday. Will keep looking.