I was told by a couple people that the rear drum brakes/trailing arms are lighter than the rear discs/trailing arms. I'm just wondering if anyone has actually weighed both assembilies?

I am about to completely rebuild my rear suspension, and am contemplating if I should just stick with rear drums.

BTW, rear build list...

Mugen trailing arm bushings
D2 LCAs
ST sway bar
custom heim toe links
custom heim camber links
custom upper/lower strut bars




Modified by Bryson at 12:27 AM 7/28/2006

 

well just get disk brakes cost mort but saves your car from minor accidents.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by project ak &raquo;</TD></TR><TR><TD CLASS="quote">well just get disk brakes cost mort but saves your car from minor accidents.</TD></TR></TABLE>

Not the kind of response I was looking for. Nor does it make any logical sense.

 

i believe there were posts in the auto-x forum with the weight figures.
it is a general consensus that the disc set-up does weight more than a drum set-up. an alunimium drum set-up from the first gen CRX weighs even less.
i have no numerical data to factualize this.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ash J. Williams &raquo;</TD></TR><TR><TD CLASS="quote">i believe there were posts in the auto-x forum with the weight figures.
it is a general consensus that the disc set-up does weight more than a drum set-up. an alunimium drum set-up from the first gen CRX weighs even less.
i have no numerical data to factualize this.</TD></TR></TABLE>

Thanks! Yeah, I'm just trying to get a feel for exactly how much lighter they are. If it's only a couple pounds, then I'll definetly get the discs.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Wes &raquo;</TD></TR><TR><TD CLASS="quote">

A drum brake set-up weighs 32.5 pounds.
A disk brake set-up weighs 39.5 pounds.

That was measured using a cheap bathroom scale, so the numbers may not be accurate, but the 7 pound difference should be fairly "real". It was done on the same day, using the same scale.

This was for the trailing arm, all brake hardware with hubs, spindles and all. No "link" arms attached.

Wes

</TD></TR></TABLE>

from this forum post https://honda-tech.com/zerothread?id=250891

 

Awsome, thanks a lot!

Looks like I'll be keeping the drums.

 

And the 86-87 CRX HF aluminum drums are 3 pounds lighter per side than the 88-91 Civic/CRX iron drums. The aluminum ones are 4 pounds each, the iron ones are 7 pounds each.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by project ak &raquo;</TD></TR><TR><TD CLASS="quote">well just get disk brakes cost mort but saves your car from minor accidents.</TD></TR></TABLE>

What are you saying? No one understand engrish.

I can say that out on track when I am coming into a turn under heavy braking I cannot tell the difference between drum or disc in the rear. IMO the only thing the disc do is clean up the look in the back and make it easier to change pads vs shoes which neither are a good reason to change to disc brakes.

The answer quoted from the link above.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Wes V &raquo;</TD></TR><TR><TD CLASS="quote">A drum brake set-up weighs 32.5 pounds.

A disk brake set-up weighs 39.5 pounds.

That was measured using a cheap bathroom scale, so the numbers may not be accurate, but the 7 pound difference should be fairly "real". It was done on the same day, using the same scale.

This was for the trailing arm, all brake hardware with hubs, spindles and all. No "link" arms attached.

Wes</TD></TR></TABLE>

 

Being that there are some really knowlageable posters in this thread Im bringing it back. I have found little to no information about swaping from my 91 DX Drums to HF for obvious reasons. What I am wondering is what parts are necessary to swap to the lighter HF rear Drums? Do i need any new trailing arms, Hubs, ect. The suspension is all off the car for now so its the best time to do this.

This is for autox use if anybody was wondering. Thanks!

 

take drum off, put 1g HF aluminum drum on.

adjust brakes as needed.

 

Just curious to know if anyone has checked the rotational mass differences? I know the disc set up is heavier but what about just the disc compared to just the drum?

 

honestly, i think if you are THAT concerned about the minute differences in moments of inertia... you ought to be more concerned about your driving.

meaning, dont bother dissecting the weight differences. its not a big deal.

 

yes it is true that it isnt a big difference but then i guess the answer to the whole point of this thread might as well of been answered dont worry about it its not a big difference as well. Just wondering thats all. i was considering doing the rear disc set up eventually but i am really knocking that further down the list of things to do now since everyone seems to say the drums are nearly as good as the discs and also lighter.

 

indeed, its not a big difference drum vs disc.

stick to your drums. the rears do very little braking.

 

Thanks Tyson! Am I correct that the 85-87 HF was the one with the AL Drums?

 

1g crx hf = 84-87 crx hf. yes...