Did Ebodies have a power drum option? I know 70 B bodies did.
Or, were all Power Brake cars front disc?
If they are front disc, isn't there a second proportioning block on the frame rail?
Is there a brake package or code difference?
I think this is all of the variants.
B62 10" drum
B62 + B51 10" drum w/power
B11 11" HD drum
B11 + B51 11" HD drum w/power
B41 + B51 Disc brake front, 10" drum rear w/power
B42 + B51 Disc brake front, 11" drum rear w/power (AAR and T/A)
Power drum was an option.
Disc brakes required the power brake option.
A32 and A34 axle packages included the B41+B51
Proportioning valve
Quote from: R/T's 4 R/P on November 24, 2020, 04:45:09 PM
Did Ebodies have a power drum option? I know 70 B bodies did.
Or, were all Power Brake cars front disc?
If they are front disc, isn't there a second proportioning block on the frame rail?
Is there a brake package or code difference?
I have an A66 70 Challenger. According to the e-bodies.org fender tag decoder output, the A66 package includes "heavy duty 11" drum brakes". There was no specific brake call-out on the fender tag. Best I can tell, the "heavy duty brakes" included a power brake booster and 11x3" shoes up front and 11x2-1/2" in the rear.
Regarding the second proportioning valve on the frame rail w/ disc brakes, the answer is "yes". It's called the "rear hold off" valve.
https://www.rosevillemoparts.com/product/proportioning-valve-1967-71-mopar-a_b_e-body/
There are several explanations available on the internet for the purpose of the hold off valve (some of which directly conflict other versions - what a shock). This version makes the most sense to me in terms of why the rear drum system needs a little head start on engaging ahead of the front discs:
https://www.freeasestudyguides.com/brake-metering-valve.html
Thanks...very helpful.
So, how would power (drum) brakes been ordered? Seems in the dealer options that power brakes are connected with disc brakes.
Or, am i missing an option line?
Is the booster the same for drum and disc?
Then the master cylinder is the same as the one for drum brakes??
The booster is same disc and drum.
Master cylinders are different drum v disc. The drum MC is same power v manual except a dust boot is bolted to the flange, and you insert a push rod with a hard rubber retainer ring into the piston that gets locked in place in the piston.