| [GMCnet] Drum brakes on rear and large calipers on mid [message #338017] |
Sat, 20 October 2018 11:23  |
JerryW
Messages: 256
Registered: August 2018
Karma:
|
Senior Member |
|
|
> johnd01 wrote on Thu, 18 October 2018 21:09
>> What about leaving the rear dumbs as they are but replacing the mid drums
>> with 13-inch discs? I would think the mid discs would brake harder than
>> rear drums while the rear drums would still brake some.
>> *John Phillips*
>
John
If people are replacing drum brakes Dave Lenzi’s kit for the large caliper on the mid axle has instructions for leaving the drums on the rear while replacing the drums on the mid. This still allows the use of the original master cylinder which gives more pressure at the rear than the P30 master cylinder.
In my case I had 11” disks on all 4 rear wheels and I had to use the P30 to get enough volume at the rear brakes.
So I decided to go back to the original master cylinder and just eliminate the rearmost brake. I have exceptional braking. The best I’ve ever had sin buying my GMC in 1981.
I am in the middle of installing Dave Lenzi’s kit on the mid axle of Gus Nottberg’s GMC and leaving his drum brakes on the rear so that he’ll still have a parking brake. We are installing Dave’s sensitized booster and a new original master cylinder. When we get it all installed and bled we’ll be able to compare his setup and mine. I’ll report on the result when it’s done.
I have used my new setup on a couple of trips now including going 1600 miles from Denver to Amana and back.
As Matt Colie recently posted, the far rear drums don’t give much braking. That is why the reaction arm was developed.
Dave’s system, in my opinion is a really great solution. It utilizes a massive caliper with two pistons with a 13” disk and was utilized on single rear axle trucks that weighed loaded 30,000 to sometimes even 40,000 pounds. Far greater than our GMC even dragging a toad.
Emery Stora
77 Kingsley
Frederick, CO
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
