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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Suspension - Brakes - Steering> Will Rear Disc's Stop Better Than Rear Drums??
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Thread: Will Rear Disc's Stop Better Than Rear Drums?? Reply to Thread
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Topic Review (Newest First)
10-25-2012 07:01 PM
Irelands child I really like the Wilwood 4 wheel discs on my '31. With a GM car, there are some nice OEM style brakes that with a bit of research, should fit nicely and probably a lot less expensive then an aftermarket "kit".

10-25-2012 06:01 PM
prostreet6t9 stoneshrink is correct as long as your stock unit will push the volume needed. You might try it with the stock unit and proportioning valve and see how it works. My 69 Camaro drum brake master didn't like it too much.

My 4 wheel disc manual set up works just great for me. I didnt want to install a booster. They do have under the dash booster set up's if ya need.
10-25-2012 03:36 PM
stoneshrink about swapping master cylinders - not necessarily. I did a disk brake swap on a 70 Buick Skylark (disk/drum) to disk/disk and went with a Corvette master cylinder.... mistake, I swapped back to the original master cylinder and proportioning valve and it stopped far better.
I did a disk/disk swap on a 83 Chevrolet pickup - left the stock master cylinder and proportioning valve - it works perfect.

no idea on the booster - but have you considered hydraboost? runs off your power steering pump and is roughly the same diameter as the master cylinder.

I wouldn't run a 4 wheel disk brake set up without some form of boost... the only car I don't have a booster on weighs 1800 lbs, and even it's kind of a pain (but no chance of any kind of booster so I simply suffer)
10-25-2012 03:07 PM
jroadstar Ok thanks now I'm not intending to sell it but pass it down to my grandson when he comes of age he's 3 at them present time so it will be a while. Now I'm intending on using a non power brake setup cause of the car having fender well headers our do y'all think a small booster would fit ie a 7" dual diaphragm version ?
10-25-2012 11:20 AM
prostreet6t9
Quote:
Originally Posted by jroadstar View Post
Hi everyone, I've been reading this posting and now I'm curious as to wether i should spend the money on a complete four wheel brake conversion on my 66 nova. I don't road race it it's just a street car that i also like to take to car shows. Can y'all give me some input before i order the parts i value anyone's opinion , thanks in advance for y'alls help.
Make sure and change to the correct master Cyl and you'll be happy with the swap.
10-25-2012 10:39 AM
stoneshrink As with all good answers, there isn't a yes or no. The answer is going to come from you, disk brakes stop better because they do not fade from heat buildup as quickly as drum brakes. If you do a lot of stop and go driving, if you do spirited driving on curvy roads, or you want to race/do an autocross then disk brakes are pretty much required.

That said, most drag racers use drum brakes on the rear because they're lighter, and have less drag than a disk brake - and they never get them so hot they'll fade (at least not often - or put another way, if they are fading, the drag racer has more pressing problems than hot brakes).

In your case, I'd put disk brakes on - because it's expected - if you plan on selling the car, having rear, drum brakes will definite reduce the desireability and sales price (the buyer will think you cheaped out). Also, the cost difference between disk/drum and disk/disk has come down to the point where it's almost a wash. Add to all of that, you have peace of mind that your brakes will be better than EVERY driving situation you could ever hit; and the choice becomes even clearer
10-25-2012 09:49 AM
jroadstar Hi everyone, I've been reading this posting and now I'm curious as to wether i should spend the money on a complete four wheel brake conversion on my 66 nova. I don't road race it it's just a street car that i also like to take to car shows. Can y'all give me some input before i order the parts i value anyone's opinion , thanks in advance for y'alls help.
11-04-2007 01:18 PM
stoneshrink
Disk brake rears

I just finished (okay almost) the rear disk conversion using GM intergral brake/parking brake. It is absolutely imparative that you connect the emergency cable because it, like older gm drum brakes, use the emergency brake to adjust the rear pads. To the person at the start of this thread, having a residual pressure regulator is unnecessary.

Also, as has been stated a few times, disk brakes are worse for drag racing because of the extra weight of the rotors (rotating mass), and extra weight of the calipers. In fact serious drag racers use aluminum drums in an attempt to lose even more rotating mass. In Drags you don't care about repeated stops - so heat isn't an issue; nor is quick wear an issue either. However, if you're driving and stopping often is a part of that drive - disks are better because they expell heat far better then drums.

On my Buick 12 bolt, I copied what others are doing, but in the end I bought a Calipers and backing plate at a swap meet for $40 bucks.... otherwise, I'd have bought from one of the ebayers or from Jegs/Summit for $700 bucks.
10-29-2007 10:23 AM
xautoracer
Best reason for rear discs

Rear drums lock up in warm wet weather....It's easier to drive looking out the windshield than twisted around looking out the back window....
10-28-2007 08:56 AM
NEW INTERIORS
Quote:
Originally Posted by mercmad63
I find it really amazing that 54 years after disc brakes were found to be the only really effective braking system on a high performance car that people will still insist that rear drums are better.
I too like the feel of discs on a car,even though winding roads are rare here it still gives a feeling of confidence just to be able to negotiate traffic knowing the brakes are going to work well.
Perhaps those who have rear drums don't really have a high performance car or have never used what horsepower they do have.
I know manufacturers like Ford etc still have rear drums on a lot of their products,but that's because they are cheap and their falling sales figures reflect that.
This man said all you need to know!!!!!
08-31-2007 08:57 PM
mercmad63 Toyota prius had drums on the rear on the first series ,known to the prius enthusiasts as a "classic" LOL!!!!!
.
08-31-2007 08:33 PM
IanRiordan I saw a new civic hybrid being pre delivered yesterday, guess what? drums on the rear! I know drums (properly adjusted) have less drag than discs, but if any manufacturer should cop flak over the use of drums in this day and age, it should be honda. Commodores and Falcons have had 4 wheel discs standard since around 1990, yet honda still use drums.
BTW, until 2 years ago M/Benz were using drums on the w168 'A' class.
Not all discs are equal, my stock vs Statesman (with abs) brakes almost as well as my heavier HQ ute with stock Holden front brakes and a disc brake 9 inch out of a 1973 Aussie Ford Landau. The only changes I made to the standard hydraulics were to delete the non return valve from the rear circuit of the master cylinder and, after trial and error, a 1mm shim in the proportioning valve.
08-30-2007 03:27 PM
mercmad63 I find it really amazing that 54 years after disc brakes were found to be the only really effective braking system on a high performance car that people will still insist that rear drums are better.
I too like the feel of discs on a car,even though winding roads are rare here it still gives a feeling of confidence just to be able to negotiate traffic knowing the brakes are going to work well.
Perhaps those who have rear drums don't really have a high performance car or have never used what horsepower they do have.
I know manufacturers like Ford etc still have rear drums on a lot of their products,but that's because they are cheap and their falling sales figures reflect that.
08-30-2007 09:52 AM
timothale
4 wheel disc yes

I just like the feel of a good 4 wheel disc setup... did a little work and helped with the 427 Cobra that set the roadrace track record at MIS...It weighed a little over 2000 pounds... lighter than most rods... Cobra used 2 master cylinders for the brakes with an adjustable balance bar to adjust for front to rear for tires, suspension and weight balance. .. there are double master cylinders kits available and I plan on using one on my 32 roadster, jag front and rear (still a pile of parts in the shop) ... retired Ford engineer
07-24-2007 07:08 AM
canook2u
Converting from drum to disc

I'm considering converting my Jeep to rear disc, (Grand Cherokee parts),
but how do you go about deciding what parts to use for older cars, like
' 60s Mopars, or Chevys?
Are there kits, or is it trial and error fitment?
If there are kits, who makes them, are there some better than others?
Thanks,

Fred - The new guy
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