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Bracket Talk Bracket Talk Forum Tech Talk - by Abruzzi Dragsters w/ 4 calipers questionGo | New | Find | Notify | Tools | Reply | |
| Dragsters w/ 4 calipers question | Login/Join |
| DRR Top Comp |
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 | ||
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| DRR Sportsman |
Are you planning on one master cylinder for all four calipers or two in order to have two seperate braking systems? Kevin | |||
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DRR Elite |
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 | |||
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DRR S/Pro |
That sounds kind of dangerous to me. 2 calipers working on one side. ____________________________ 2017 and 2018 Osage Casinos Tulsa Raceway Park No-Box Champion 2018 Div4 Goodguys Hammer award winner | |||
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DRR Trophy |
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 | |||
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DRR Sportsman |
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 | |||
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| DRR S/Pro |
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 ____________________________ 2017 and 2018 Osage Casinos Tulsa Raceway Park No-Box Champion 2018 Div4 Goodguys Hammer award winner | |||
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DRR Top Comp |
On my altered I put dual brakes on it with a hand brake and separate master cylinder in case of a brake failure. https://postimg.cc/gallery/np3zpruo/ "Dunning-Kruger Effect" -a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge. Before you argue with someone ask yourself, "Is this person mentally mature enough to grasp the concept of a different perspective?" If not there is no point to argue. 4X NE2 CHAMPION. 2020 TDRA NE2 Champion | |||
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| DRR Top Comp |
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 F J B | |||
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| DRR Elite |
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 | |||
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| DRR Top Comp |
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 F J B | |||
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| DRR Elite |
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 | |||
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| DRR Trophy |
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 | |||
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DRR Pro |
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).  ΜΟΛΩΝ ΛΑΒΕ | |||
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DRR S/Pro |
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 | |||
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| DRR Top Comp |
This... . Dave F J B | |||
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| DRR Sportsman |
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 | |||
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| DRR Elite |
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 | |||
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| DRR Pro |
7/8 bore tilton masters part numbers 74-875U | |||
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| DRR Top Comp |
Thanks Kevin and Jenavet. I think I've even got a credit at Tilton... . Dave F J B | |||
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Bracket Talk Bracket Talk Forum Tech Talk - by Abruzzi Dragsters w/ 4 calipers question
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