Slant Six Forum :: Well it appears I have an 8 1/4" rear end

Actually I think you are probably right about that. What disk brakes do give you though is reduced rotating mass and, if they can be moved inboard as on some Jaguars, they reduce unsprung weight as well.

Chrysler used disk brakes for a couple of years in the 50s but they were dropped because pedal efforts were too high for comfort. Improvements in power brake systems made them popular again, and eventually they became the norm.

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Mmmm...I'm fairly certain that is not why Chrysler's disc brakes of the '55-'56 era were dropped. They were actually a full-disc-contact system (think in terms of a clutch disc, compared to the spot-contact disc brakes we all know) and were self-energising; pedal effort was much lower than an unboosted spot-disc system and the brakes were highly effective. But, they were very expensive to build and offer, and few people understood why they were better, and the tires of the day limited their practical advantage, so demand was low and they were dropped.

I didn't realise they were that type, interesting. Isn't that the system that Crosley used for a while?

9 inch drums forever

Question: Crosley had disc brakes?

Answer: From mid 1949 to mid 1950, all Crosleys used the Goodyear-Hawley Hydra-Disc airplane type brakes, on all four wheels. The first American auto company to use modern Disc Brakes. The disc brakes were short lived due to corrosion problems in parts of the country that used salt. Since they were adapted from airplane use the alloy used was not appropriate for road use.

Author:	Charrlie_S [ Sat May 12, 2007 4:58 am ]
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Quote: Actually I think you are probably right about that. What disk brakes do give you though is reduced rotating mass and, if they can be moved inboard as on some Jaguars, they reduce unsprung weight as well. Don't get me wrong. In my opinion, On our type cars, the disc front/drum rear, is the way to go. My cars are primarilly race cars. I run a 1/4 mile, at close to 100 mph, make 1 stop with a lot of room, then the brakes have a long time to cool off. So for me, 9 inch drums (in excellent condition), work just fine, and save weight, and cost. I do have a split system, though.

Author:	dakight [ Sat May 12, 2007 9:40 am ]
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Split system is absolutely a must for safety no matter what kind of brakes you run. Drum brakes were the norm for a good 75 years and they work well for most normal driving but heavy stop and go, high speeds on crowded freeways and mountain roads all beg for a better system. I had forgotten about it, but Chrysler used disk brakes for a couple of years in the 50s but they were dropped because pedal efforts were too high for comfort. Improvements in power brake systems made them popular again, and eventually they became the norm.

Author:	SlantSixDan [ Sat May 12, 2007 10:56 am ]
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Quote: Chrysler used disk brakes for a couple of years in the 50s but they were dropped because pedal efforts were too high for comfort. Improvements in power brake systems made them popular again, and eventually they became the norm. Mmmm...I'm fairly certain that is not why Chrysler's disc brakes of the '55-'56 era were dropped. They were actually a full-disc-contact system (think in terms of a clutch disc, compared to the spot-contact disc brakes we all know) and were self-energising; pedal effort was much lower than an unboosted spot-disc system and the brakes were highly effective. But, they were very expensive to build and offer, and few people understood why they were better, and the tires of the day limited their practical advantage, so demand was low and they were dropped.

Author:	dakight [ Sat May 12, 2007 12:46 pm ]
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I didn't realise they were that type, interesting. Isn't that the system that Crosley used for a while?

Author:	Jopapa [ Sat May 12, 2007 1:27 pm ]
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Quote: Quote: Chrysler used disk brakes for a couple of years in the 50s but they were dropped because pedal efforts were too high for comfort. Improvements in power brake systems made them popular again, and eventually they became the norm. Mmmm...I'm fairly certain that is not why Chrysler's disc brakes of the '55-'56 era were dropped. They were actually a full-disc-contact system (think in terms of a clutch disc, compared to the spot-contact disc brakes we all know) and were self-energising; pedal effort was much lower than an unboosted spot-disc system and the brakes were highly effective. But, they were very expensive to build and offer, and few people understood why they were better, and the tires of the day limited their practical advantage, so demand was low and they were dropped. Sounds alot like the multi-rotor and disc systems we use on our heavies nowadays. Kinda cool systems actually, but messing around with a three-thousand PSI hydraulic system isn't something I really enjoy....

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Well it appears I have an 8 1/4" rear end https://slantsix.org/forum/viewtopic.php?t=22670	Page 4 of 4

Author:	SlantSixDan [ Sat May 12, 2007 2:27 pm ]
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Quote: I didn't realise they were that type, interesting. Isn't that the system that Crosley used for a while? That's possible. I don't know much about Crosleys or Crossleys!

Author:	65 dartman [ Sat May 12, 2007 4:05 pm ]
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Quote: 9 inch drums forever Our 93 Dakota shortbed and 95 Jeep Cherokee both have front discs and 9 in rear brakes and I have yet to lock up the rears on either vehicle. IMHO the Jeep stops better than the Dakota (maybe because it doesn't have the light weight in the rear like the Dakota)

Author:	dakight [ Sat May 12, 2007 4:24 pm ]
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Curious, I did a little snooping and here's what I found: Quote: Question: Crosley had disc brakes? Answer: From mid 1949 to mid 1950, all Crosleys used the Goodyear-Hawley Hydra-Disc airplane type brakes, on all four wheels. The first American auto company to use modern Disc Brakes. The disc brakes were short lived due to corrosion problems in parts of the country that used salt. Since they were adapted from airplane use the alloy used was not appropriate for road use. From: http://www.ggw.org/~cac/Crosley_Q-A.html As near as I can tell these were "spot" systems using a caliper and rotor, not the disc/pressure plate systems used by Chrysler. By the way, Crosley and Crossley are two seperate companies; the former and American company and the latter British.

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