Drum Brake upgrade??

[Mike10secv6]

fhsedhsetgesat

[87natty]

I don't have a part number, but HD S-10 brake cylinders bolt right on.

I'm sorry, I just realized you wanted info on a whole bigger drum, I'm interested too.

[Dwayne]

I had Ford ends welded on my rearend, then used a Ford Drum Brake kit from Moser. These Ford drums are much larger than the stock GM drums. The kit is complete. All I had to do was bolt it on, bleed the brakes, and go racin'. I can hold all the boost I want without any "push".

[Ross]

Not really what you are asking about, but I installed S-10 wheel cylinders from an 85 Chevy S-10 w/ manual brakes. I also bought 2 sets of shoes and used all 4 long shoes.

Plenty of holding power now.

Ross

[GNVYUS 1]

Aluminum drums off some of the late 70's chevys fit, I got mine at a yard for $40. Most guys have the larger shoes with upgraded cylinders.

[Roger]

I've heard about the Ford setup as mentioned by Dwayne with disk brakes.

[zbuickman]

The company formerly known as Bowling Green Customs used to sell a proportioning valve bypass kit. reported to be able to hold back @ 20# of boost. I had there link now as Southern Kustoms & Racing. but the link is no longer any good. I have one but never installed it. If any one wants part #s all the parts should be available through an industrial parts dist. (ie. mcmaster)

[JayC]

Its actually a Hydraforce valve. I have one downstairs in the garage somewhere. The valve isnt too terribly expensive (~$50.00ish I think) but the other fittings you need are what drives the price up.

Also, for bigger brakes, you can look at some from like one of the larger full size Buick cars made around the same area. You will probably need to have the backing plates reenforced and have them redrilled tho.

[Silver 6]

The way I understand it is....To mount the 11" rear brakes you need to drill the two top mounting holes and cut the top of the axle flange to fit the backing plate. The hump on the top gets in the way. And it bolts on. The two bottom bolts should line up and you can then mark where to drill the top two.

A 76 Nova cop car had 11" front disc and 11" rear drums. They ran an F70-14 radial tire. The cars weights were close to our Regals. They pulled 1.2 G's on the braking test pad, over and over.

Drums hold against boost the best, these 11's should fit in almost any wheel, (the Nova ran 14's), they are the most direct replacement, parts are available anywhere.

BG Customs was selling this as a kit. Why isn't it more common? Not as cool or high tech as a Baer system??

[GNVYUS 1]

Silver 6 you might have something here. I never heard of this mod and would think the vacuum conversion guys would be all over this considering they hold less than the powermaster GN's.

More info please. :essen:

[87natty]

Hell, that got my attention. Do you have any pictures of this set up? And exactly what parts are used in addition to the GN parts?

[Silver 6]

It seems like all the 8.5 rears came with four bolt housing ends, except our G bodies. The larger 11' brakes came on the V8 mid-sized cars in 76-77 and many of the heavier duty large body cars from 77 on.

http://www.mpbrakes.com/dr1700k.htm

The station wagons had a larger drum to shed more heat, but it looks like they took the same parts inside.