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Dragsters w/ 4 calipers question
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DRR Top Comp
posted
New dragster has 2 calipers per wheel/ 4 total. They're Strange 4 puck calipers.
6-1 pedal ratio.
Dual master cylinders.

My question is 3/4" or 7/8" bore on the master cylinders?
Just what others are actually running.


.
Dave



F J B

 
Posts: 4428 | Location: Earth | Registered: February 08, 2006Reply With QuoteReport This Post
DRR Sportsman
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Are you planning on one master cylinder for all four calipers or two in order to have two seperate braking systems? Kevin
 
Posts: 192 | Location: Corunna, Ontario, Canada | Registered: September 30, 2001Reply With QuoteReport This Post
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If I was doing that I'd have a master cylinder for each side. That way if a hat or rotor fails you'd still have brakes.


TAKE IT TO THE BANK!!!!!
Later, Bill Koski
 
Posts: 10995 | Location: LAS VEGAS. NEVADA, US of A | Registered: December 03, 1999Reply With QuoteReport This Post
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Picture of CURTIS REED
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quote:
Originally posted by Bill Koski:
If I was doing that I'd have a master cylinder for each side. That way if a hat or rotor fails you'd still have brakes.


That sounds kind of dangerous to me. 2 calipers working on one side.



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quote:
Originally posted by CURTIS REED:
quote:
Originally posted by Bill Koski:
If I was doing that I'd have a master cylinder for each side. That way if a hat or rotor fails you'd still have brakes.


That sounds kind of dangerous to me. 2 calipers working on one side.


Typically the setup is dual caliper per rotor and then two master cylinders, one master cylinder controlling the front side of the calipers per rotor and then the second controlling the backside.. This setup allows you to always have equal brakes per system..


Nick Craig

1971 Camaro Split Bumper
376ci LS3
 
Posts: 410 | Location: Ohio | Registered: December 28, 2013Reply With QuoteReport This Post
DRR Sportsman
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Should have one set on hand brake and one set on foot brake pedal.
Mark Williams has a chart on there web site on choosing master cylinder size.


Working for the Weekend!!!!
Fordyce Motorsports
 
Posts: 248 | Location: Williamstown, NJ | Registered: November 20, 2009Reply With QuoteReport This Post
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Picture of CURTIS REED
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quote:
Originally posted by NC3x58:
quote:
Originally posted by CURTIS REED:
quote:
Originally posted by Bill Koski:
If I was doing that I'd have a master cylinder for each side. That way if a hat or rotor fails you'd still have brakes.


That sounds kind of dangerous to me. 2 calipers working on one side.


Typically the setup is dual caliper per rotor and then two master cylinders, one master cylinder controlling the front side of the calipers per rotor and then the second controlling the backside.. This setup allows you to always have equal brakes per system..


I know how it is usually done, but the way Koski stated it as "each side" makes it sound like a master cylinder for driver's side and one for passenger side not a front pair and rear pair. That is what I was referencing.

Curtis



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On my altered I put dual brakes on it with a hand brake and separate master cylinder in case of a brake failure.


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Posts: 3916 | Location: United States of Texas | Registered: April 02, 2011Reply With QuoteReport This Post
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The very last thing I would want is having only one side of the braking system working. I'd rather go into the sand/net than an instant right/left into the wall.
I will have one m/c plumbed to the rear calipers and one m/c plumbed to the front calipers. Both m/c are on one pedal.

I was just asking what bore size m/c people with this set up were using. I'm leaning towards a 7/8" bore..


.
Dave



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Posts: 4428 | Location: Earth | Registered: February 08, 2006Reply With QuoteReport This Post
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An instant turn INTO THE WALL?
You must be running an open differential?
Don't feel bad, I've seen this reaction from a few other people!


TAKE IT TO THE BANK!!!!!
Later, Bill Koski
 
Posts: 10995 | Location: LAS VEGAS. NEVADA, US of A | Registered: December 03, 1999Reply With QuoteReport This Post
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I don't believe you Bill....disconnect one side of your brake system and go make a run and then hit your brakes.
Please....


.
Dave



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Posts: 4428 | Location: Earth | Registered: February 08, 2006Reply With QuoteReport This Post
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I did.
Years ago I had a rear caliper fail at the 1st day of a 3 day race, plugged the line to that caliper and raced the weekend with no problems other then having to use more pedal pressure.
Just think rationally here, with a spool the tires don't know where the braking is coming from!!!!!
As I posted with a MC plumbed to both sides if one rotor comes out of the caliper, or calipers, for whatever reason YOU ARE TOTALLY WITHOUT BRAKES!!!!!


TAKE IT TO THE BANK!!!!!
Later, Bill Koski
 
Posts: 10995 | Location: LAS VEGAS. NEVADA, US of A | Registered: December 03, 1999Reply With QuoteReport This Post
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quote:
Originally posted by CURTIS REED:
quote:
Originally posted by NC3x58:
quote:
Originally posted by CURTIS REED:
quote:
Originally posted by Bill Koski:
If I was doing that I'd have a master cylinder for each side. That way if a hat or rotor fails you'd still have brakes.


That sounds kind of dangerous to me. 2 calipers working on one side.


Typically the setup is dual caliper per rotor and then two master cylinders, one master cylinder controlling the front side of the calipers per rotor and then the second controlling the backside.. This setup allows you to always have equal brakes per system..


I know how it is usually done, but the way Koski stated it as "each side" makes it sound like a master cylinder for driver's side and one for passenger side not a front pair and rear pair. That is what I was referencing.

Curtis


I guess that's what I was referencing as well.. Having 1 master cylinder for 1 wheel with two calipers would be scary I would think.


Nick Craig

1971 Camaro Split Bumper
376ci LS3
 
Posts: 410 | Location: Ohio | Registered: December 28, 2013Reply With QuoteReport This Post
DRR Pro
Picture of Roger McGinnis
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quote:
Originally posted by Bill Koski:

Just think rationally here, with a spool the tires don't know where the braking is coming from!!!!!


Exactly. Our open wheel dirt cars not only have one master cylinder, they only have one caliper on the rear end. Now on the front is a different story. Still only one of each (on the left front for turning).



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quote:
Originally posted by Bill Koski:
I did.
Years ago I had a rear caliper fail at the 1st day of a 3 day race, plugged the line to that caliper and raced the weekend with no problems other then having to use more pedal pressure.
Just think rationally here, with a spool the tires don't know where the braking is coming from!!!!!
As I posted with a MC plumbed to both sides if one rotor comes out of the caliper, or calipers, for whatever reason YOU ARE TOTALLY WITHOUT BRAKES!!!!!


I had the same initial reaction as everyone else, but on my junior dragsters there is a single caliper in the center of the rear axle. Would the car react differently if that caliper was way off to one side or another? No.

It is an interesting thought, but I'd opt for two separate braking systems plumbed to both wheels. I wish I'd added the handbrake option when my car was built, but that was in the era when NHRA was confiscating brake handles.


Tony Leonard
 
Posts: 3133 | Location: Inver Grove Heights, MN | Registered: March 18, 2004Reply With QuoteReport This Post
DRR Top Comp
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quote:
Originally posted by imakehp:
New dragster has 2 calipers per wheel/ 4 total. They're Strange 4 puck calipers.
6-1 pedal ratio.
Dual master cylinders.

My question is 3/4" or 7/8" bore on the master cylinders?
Just what others are actually running.



This...


.
Dave



F J B

 
Posts: 4428 | Location: Earth | Registered: February 08, 2006Reply With QuoteReport This Post
DRR Sportsman
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Dave, 7/8" bore per 2 calipers with -3 (3/16") brake line. I've tried other combinations and this is what works best and I've used the Mark Williams pressure gauge to verify different working pressures with different size master cylinders and lines. Hope this helps. Kevin
 
Posts: 192 | Location: Corunna, Ontario, Canada | Registered: September 30, 2001Reply With QuoteReport This Post
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Picture of Bill Koski
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With that much clamping pressure I'd go with 1" or even 1 1/8" MC's.
It will be real easy to lock the brakes up.


TAKE IT TO THE BANK!!!!!
Later, Bill Koski
 
Posts: 10995 | Location: LAS VEGAS. NEVADA, US of A | Registered: December 03, 1999Reply With QuoteReport This Post
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7/8 bore tilton masters part numbers 74-875U
 
Posts: 1422 | Location: united states | Registered: January 16, 2006Reply With QuoteReport This Post
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Thanks Kevin and Jenavet. I think I've even got a credit at Tilton...


.
Dave



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Posts: 4428 | Location: Earth | Registered: February 08, 2006Reply With QuoteReport This Post
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