Disc, drum brakes????

rallye bob · 10-23-2007, 07:06 PM

Who can help me design the hydraulics part, of a disc drum 3500 lb. drag car, that runs in the mid. 10's @ around 120-130 mph? I am looking for advice on M/C bore size, (i am going to use a Strange Eng. M/C) residual valves, prop valves, do I use the stock combo. valve? I am using the Aerospace ac-205 front disc kit, and the stock drums on the rear. Any help in this area would be greatly appreciated, as the braking as I have it set up now is atrocious.

Alan Roehrich · 10-23-2007, 07:31 PM

Bob, the best thing to do is ask Strange what master cylinder you need. The proportioning valve is probably going to need to be an adjustable from an aftermarket source like Wilwood. If the master cylinder is ABOVE the calipers and the wheel cylinders, residual valves aren't usually required. If you're buying or have bought brake parts from a company, then let them tell you what to use. Part of what you're paying for is their help and expertise on getting it all right and working safely. The brake system is no place for guess work or Rube Goldberg engineering.

rallye bob · 10-24-2007, 05:27 AM

Thanks Alan;
I talked to Strange, but they always seem so rushed with their answers, and act like they just want to get you off the phone. I know they are busy, so I thought I would come to the guys that have been there, done that.
Bob
PS: Not a fan of Rube Goldberg engineering.......LOL

Harry 6674 · 10-24-2007, 10:50 AM

If Strange doesn't seem willing to give you the information you need for a safe system, I would look at a different manufacturer. You don't need that crap.

Dave Goob Cook · 10-24-2007, 11:55 AM

Don't make it harder than it needs to be.

How ya been Bob?
If you don't remember:
I have stock G-Body (metric) front calipers, 68-72 A-Body rear drum brakes, M/C from an '81 C-10 P/U manual disc/drum setup (aluminum/plastic), NO differential valve(s), no residual valve(s), nothing, and the car stops as well or better than it ever did at 126, holds better on the starting line footbraking, (which is admittedly weak anyway, the 9" x 2" drums aren't a hot setup for that) but the balance of the system is great, it will lock the rears slightly before the fronts when making a hard stop. ( I raced a short, short shutdown track for 2 years with this setup)
The only trick was grabbing the M/C, pushrod, and rod retainer from a junk truck, only modification was the length of the pedal rod, but MAKE SURE the pedal rod is positively retained into the M/C, whatever you do.......

Some of the 88-92 S-10 P/U truck stuff will fit in as well.......

rallye bob · 10-25-2007, 05:21 AM

As you may know Dave. I have been chasing this "gremlin" (not the car) for quite sometime. :-(
Just to clarify, this is for a drag race only system/car...

Dave Goob Cook · 10-25-2007, 01:41 PM

Actually, I'm way behind on the saga.....I don't visit the old places where we used to run into Ed.

I've done the same deal on a mid-tens stock front sub Nova as well, results good.

rallye bob · 10-25-2007, 02:58 PM

Good ol' Ed....... Every stop has one...;-)

10-23-2007, 07:06 PM	#1
rallye bob Member Join Date: Sep 2006 Location: Genoa, Illinois Posts: 488 Likes: 8 Liked 6 Times in 4 Posts	Disc, drum brakes???? Who can help me design the hydraulics part, of a disc drum 3500 lb. drag car, that runs in the mid. 10's @ around 120-130 mph? I am looking for advice on M/C bore size, (i am going to use a Strange Eng. M/C) residual valves, prop valves, do I use the stock combo. valve? I am using the Aerospace ac-205 front disc kit, and the stock drums on the rear. Any help in this area would be greatly appreciated, as the braking as I have it set up now is atrocious.

10-23-2007, 07:31 PM	#2
Alan Roehrich VIP Member Join Date: May 2006 Location: Murfreesboro TN Posts: 4,951 Likes: 1,044 Liked 1,126 Times in 297 Posts	Re: Disc, drum brakes???? Bob, the best thing to do is ask Strange what master cylinder you need. The proportioning valve is probably going to need to be an adjustable from an aftermarket source like Wilwood. If the master cylinder is ABOVE the calipers and the wheel cylinders, residual valves aren't usually required. If you're buying or have bought brake parts from a company, then let them tell you what to use. Part of what you're paying for is their help and expertise on getting it all right and working safely. The brake system is no place for guess work or Rube Goldberg engineering. __________________ Alan Roehrich 212A G/S

10-24-2007, 05:27 AM	#3
rallye bob Member Join Date: Sep 2006 Location: Genoa, Illinois Posts: 488 Likes: 8 Liked 6 Times in 4 Posts	Re: Disc, drum brakes???? Thanks Alan; I talked to Strange, but they always seem so rushed with their answers, and act like they just want to get you off the phone. I know they are busy, so I thought I would come to the guys that have been there, done that. Bob PS: Not a fan of Rube Goldberg engineering.......LOL

10-24-2007, 10:50 AM	#4
Harry 6674 Senior Member Join Date: Dec 2006 Posts: 589 Likes: 0 Liked 0 Times in 0 Posts	Re: Disc, drum brakes???? If Strange doesn't seem willing to give you the information you need for a safe system, I would look at a different manufacturer. You don't need that crap.

10-24-2007, 11:55 AM	#5
Dave Goob Cook Member Join Date: Dec 2006 Location: Indy Posts: 422 Likes: 0 Liked 0 Times in 0 Posts	Re: Disc, drum brakes???? Don't make it harder than it needs to be. How ya been Bob? If you don't remember: I have stock G-Body (metric) front calipers, 68-72 A-Body rear drum brakes, M/C from an '81 C-10 P/U manual disc/drum setup (aluminum/plastic), NO differential valve(s), no residual valve(s), nothing, and the car stops as well or better than it ever did at 126, holds better on the starting line footbraking, (which is admittedly weak anyway, the 9" x 2" drums aren't a hot setup for that) but the balance of the system is great, it will lock the rears slightly before the fronts when making a hard stop. ( I raced a short, short shutdown track for 2 years with this setup) The only trick was grabbing the M/C, pushrod, and rod retainer from a junk truck, only modification was the length of the pedal rod, but MAKE SURE the pedal rod is positively retained into the M/C, whatever you do....... Some of the 88-92 S-10 P/U truck stuff will fit in as well.......

10-25-2007, 05:21 AM	#6
rallye bob Member Join Date: Sep 2006 Location: Genoa, Illinois Posts: 488 Likes: 8 Liked 6 Times in 4 Posts	Re: Disc, drum brakes???? As you may know Dave. I have been chasing this "gremlin" (not the car) for quite sometime. :-( Just to clarify, this is for a drag race only system/car... Last edited by rallye bob; 10-25-2007 at 09:48 AM.

10-25-2007, 01:41 PM	#7
Dave Goob Cook Member Join Date: Dec 2006 Location: Indy Posts: 422 Likes: 0 Liked 0 Times in 0 Posts	Re: Disc, drum brakes???? Actually, I'm way behind on the saga.....I don't visit the old places where we used to run into Ed. I've done the same deal on a mid-tens stock front sub Nova as well, results good.

10-25-2007, 02:58 PM	#8
rallye bob Member Join Date: Sep 2006 Location: Genoa, Illinois Posts: 488 Likes: 8 Liked 6 Times in 4 Posts	Re: Disc, drum brakes???? Good ol' Ed....... Every stop has one...;-) Last edited by rallye bob; 10-25-2007 at 03:05 PM.