Disc Brake Conversion 72 442

Rocketguy

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Hello jpru and welcome to the forum!

I believe these kits are made by The Right Stuff and I have installed them. The installation was straight forward and the difference it makes is incredible.

The two biggest surprises were that the bracket for the rear brake hose has to be welded to the axle and due to the thickness of the rear rotors longer wheel studs had to be installed.

Since most of the cars I work on have low vacuum cam shafts I will not install power brakes with this kit again; I'll use a manual disc master cylinder.



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steve3443

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Hello jpru and welcome to the forum!

I believe these kits are made by The Right Stuff and I have installed them. The installation was straight forward and the difference it makes is incredible.

The two biggest surprises were that the bracket for the rear brake hose has to be welded to the axle and due to the thickness of the rear rotors longer wheel studs had to be installed.

Since most of the cars I work on have low vacuum cam shafts I will not install power brakes with this kit again; I'll use a manual disc master cylinder.



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You hit on an important thing when you talked about low (engine?) vacuum (although not sure what you mean about cam shafts - mine is original):

Some time ago I did install a front brake disc conversion (also from opg) on my 1970 cutlass s holiday coupe with 350 2bbl and my issue
with it was the vacuum pressure needed to make the brakes to work is higher than standard drum brakes and even though I installed
the new vacuum booster that came with the kit, the vacuum pressure was hovering near the minimum for it to work and the brake performance
was not great.
I may re-install my original brake booster as it is a bigger unit but I'm not sure.
Haven't driven it much due also to chronic engine/coolant overheating issue despite completely rebuilt and new 4 core rad.
 

tony galletta

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For Rocketguy,
You hit on an important thing when you talked about low (engine?) vacuum (although not sure what you mean about cam shafts - mine is original):

Some time ago I did install a front brake disc conversion (also from opg) on my 1970 cutlass s holiday coupe with 350 2bbl and my issue
with it was the vacuum pressure needed to make the brakes to work is higher than standard drum brakes and even though I installed
the new vacuum booster that came with the kit, the vacuum pressure was hovering near the minimum for it to work and the brake performance
was not great.
I may re-install my original brake booster as it is a bigger unit but I'm not sure.
Haven't driven it much due also to chronic engine/coolant overheating issue despite completely rebuilt and new 4 core rad.
Obviously old news on an old post but for anyone worry about the same issue from low vacuum from Perf ‘d engine effecting brake booster performance. Power brake Vac assist pumps available for Performance Engines w this issue. Even Amazon has a cheap one or go w more confidence @ Summit or Jegs. Increasing the size of the booster will not increase the vacuum u need to increase the amount of vacuum.
 
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tony galletta

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I've been thinking about installing a disc brake conversion kit on my '72 442. OPG has them.
https://www.opgi.com/cutlass/1972/brake-systems/disc-brakes/G240378/

Just wondering if anyone here has done this and was it worth it?
Guessing it’s done by now? U gotta b happy u did! I did on my ‘67 & love the discs. Less pedal effort w more stopping power! Gor others contemplating this conversion, check / change ur ball joints @ same time as ur almost there once u split the A’s to put the new spindles for the disc brakes! Regardless b super cautious removing coil springs!!! Use a good spring compressor!!
 
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