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disc brakes #2760281
04/05/20 09:12 AM
04/05/20 09:12 AM
Joined: Apr 2016
Posts: 8
s.d.
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kermit1 Offline OP
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kermit1  Offline OP
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Joined: Apr 2016
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s.d.
Does anyone know why disc brake E and B body cars have 10 inch rear drums and not 11inch.im using 1970 as my example.also has anyone tried switching to 11 inch and what where the results.thanks.

Re: disc brakes [Re: kermit1] #2760285
04/05/20 09:24 AM
04/05/20 09:24 AM
Joined: Aug 2005
Posts: 1,208
Az
69hemibeep Offline
pro stock
69hemibeep  Offline
pro stock

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Posts: 1,208
Az
My brother thought he would upgrade his Challenger to 11" rear and then had to add a proportioning valve because the rear brakes were to aggressive.


1969 Hemi Roadrunner 2nd owner
Re: disc brakes [Re: 69hemibeep] #2760396
04/05/20 02:31 PM
04/05/20 02:31 PM
Joined: Jan 2003
Posts: 5,338
Abilene, Texas
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fastmark Offline
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fastmark  Offline
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Posts: 5,338
Abilene, Texas
The trans am cars have rear 11’ brakes. I’ve had my rear brakes lock up under hard braking on my AAR. That’s not good.

Re: disc brakes [Re: kermit1] #2760404
04/05/20 02:51 PM
04/05/20 02:51 PM
Joined: Jan 2003
Posts: 26,973
Oregon
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AndyF Offline
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AndyF  Offline
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Posts: 26,973
Oregon
Put the 11.75 rotors up front and then put the 11 inch rear drums out back. You'll notice the difference. I had that setup on my early B body and it felt like you hit quicksand when you stood on the brakes. The car just dropped down and stopped.

Re: disc brakes [Re: fastmark] #2760473
04/05/20 05:57 PM
04/05/20 05:57 PM
Joined: Apr 2016
Posts: 8
s.d.
K
kermit1 Offline OP
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kermit1  Offline OP
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Joined: Apr 2016
Posts: 8
s.d.
thanks fastmark thats interesting that the factory used 11 inch rear brakes on the t/a cars.i had assumed up until now front disc could only be had with 10 inch rear.

Re: disc brakes [Re: kermit1] #2760962
04/07/20 12:31 AM
04/07/20 12:31 AM
Joined: Jan 2010
Posts: 1,191
NW Chicago suburban area
Mopar Mitch Offline
super stock
Mopar Mitch  Offline
super stock

Joined: Jan 2010
Posts: 1,191
NW Chicago suburban area
For what its worth, those 11" rear drums (finned) are very heavy in mass weight vs the non-finned 10" small drums.


Mopar Mitch "Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers! Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!

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