Bracket Talk
Dragsters w/ 4 calipers question
April 24, 2019, 01:38 AM
imakehpDragsters w/ 4 calipers question
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
April 24, 2019, 06:10 AM
Undertaker IIAre you planning on one master cylinder for all four calipers or two in order to have two seperate braking systems? Kevin
April 24, 2019, 08:18 AM
Bill KoskiIf 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
April 24, 2019, 09:17 AM
CURTIS REEDquote:
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.
____________________________
2017 and 2018 Osage Casinos Tulsa Raceway Park No-Box Champion
2018 Div4 Goodguys Hammer award winner
April 24, 2019, 09:49 AM
NC3x58quote:
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
April 24, 2019, 09:53 AM
diceman1530Should 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
April 24, 2019, 12:34 PM
CURTIS REEDquote:
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
____________________________
2017 and 2018 Osage Casinos Tulsa Raceway Park No-Box Champion
2018 Div4 Goodguys Hammer award winner
April 24, 2019, 02:03 PM
Curly1On 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"
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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
April 24, 2019, 02:06 PM
imakehpThe 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
April 24, 2019, 02:15 PM
Bill KoskiAn 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
April 24, 2019, 02:45 PM
imakehpI 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
April 24, 2019, 02:57 PM
Bill KoskiI 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
April 24, 2019, 03:55 PM
NC3x58quote:
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
April 25, 2019, 08:02 AM
Roger McGinnisquote:
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).
ΜΟΛΩΝ ΛΑΒΕ
April 25, 2019, 09:54 AM
Lenny5160quote:
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
April 25, 2019, 04:19 PM
imakehpquote:
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
April 25, 2019, 04:49 PM
Undertaker IIDave, 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
April 25, 2019, 04:51 PM
Bill KoskiWith 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
April 25, 2019, 06:11 PM
jenavet7/8 bore tilton masters part numbers 74-875U
April 26, 2019, 02:00 AM
imakehpThanks Kevin and Jenavet. I think I've even got a credit at Tilton...
.
Dave
F J B