Drag Racing Fastest Truck List inside, sortable for any make/model/engine listed.
TIME SLIP DATABASE

Front brakes?

Thread Tools
 
Search this Thread
 
Old 10-18-2010, 09:43 PM
  #31  
Teching In
 
StreetFreak's Avatar
 
Join Date: Feb 2009
Location: Hammond, La
Posts: 16
Likes: 0
Received 1 Like on 1 Post
Default

They also weigh about half as much lol
StreetFreak is offline  
Old 10-18-2010, 09:46 PM
  #32  
TECH Enthusiast
 
james8997's Avatar
 
Join Date: Oct 2009
Location: louisiana
Posts: 747
Likes: 0
Received 1 Like on 1 Post
Default

and most of there weight is on the back wheels...
james8997 is offline  
Old 10-18-2010, 09:54 PM
  #33  
Ph.D. in HUBRIS
Thread Starter
iTrader: (10)
 
custm2500's Avatar
 
Join Date: Mar 2009
Posts: 4,087
Likes: 0
Received 5 Likes on 5 Posts
Default

The rotors are 25 lbs or so each. At the 4x rule of rotating mass that is like 100 lbs off the car per side. That alone is a potential .2 not including the calipers. We are talking on paper a potential 3 tenths.

Front brakes on a modern vehicle do 60ish% of the braking not 70-80 like a few people have said. With rear disks and modern proportioning it is much closer to 50/50 in many vehicles. Hence the reason rears have disks now and they often are vented just like front rotors.

Evey one is just freaking out and not looking at the logic. My truck is factory rated to 9000 lbs. Event at 70/30 that means the fronts are rated 6300 and the rears are rated for 2700. I pulled a trailer with no brakes and a 1990 Mustang GT on it and it stopped nearly like nothing was there. Obviously the brakes can stop MUCH more then the factory weight capacity. Point being the stopping force is easily there if I were to remove the fronts.

I understand everyones point of a few pounds of prevention(hitting the sand pit) is better then the .2-.3 to be gained.
My point is it could be done without any issue for track use only. People do it all the time at every track across the country on cars that weigh in the 3200ish range, and with brakes that certainly aren't nearly as powerful as the rears of a 2500 pick up. They don't make spindle wheels only for top-fuel dragsters and anything running a spindle wheel doesn't have front brakes. Many have shoots but they don't use them every run depending how fast they are.
custm2500 is offline  
Old 10-18-2010, 09:56 PM
  #34  
Ph.D. in HUBRIS
Thread Starter
iTrader: (10)
 
custm2500's Avatar
 
Join Date: Mar 2009
Posts: 4,087
Likes: 0
Received 5 Likes on 5 Posts
Default

Originally Posted by SCOTT_A
What size tire are you using on your "narrowed stock wheels"?
The dragsters that run no front brakes are also on bicycle tires.
When I get the money I will buy a set of MT 27/4.5-16 but for now I have 215/75r16 I think.The wheels are 4" wide.
Edit: M&H- didn't want to be a liar.

Last edited by custm2500; 10-18-2010 at 10:03 PM.
custm2500 is offline  
Old 10-18-2010, 09:59 PM
  #35  
13 Second Truck Club
iTrader: (10)
 
DV2000NJ's Avatar
 
Join Date: Nov 2009
Location: Central NJ
Posts: 1,102
Likes: 0
Received 1 Like on 1 Post
Default

Yeah, the rear brakes have the stopping power, but the issue is that you're going to just lock them up. There is NO weight over the rear of your truck.

Go try to stop from 20mph with just your parking brake.
DV2000NJ is offline  
Old 10-18-2010, 10:02 PM
  #36  
Teching In
 
StreetFreak's Avatar
 
Join Date: Feb 2009
Location: Hammond, La
Posts: 16
Likes: 0
Received 1 Like on 1 Post
Default

I think a vw beetle would be more fitting for you. One of the 30hp ones.
StreetFreak is offline  
Old 10-18-2010, 10:04 PM
  #37  
TECH Enthusiast
 
james8997's Avatar
 
Join Date: Oct 2009
Location: louisiana
Posts: 747
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by custm2500
The rotors are 25 lbs or so each. At the 4x rule of rotating mass that is like 100 lbs off the car per side. That alone is a potential .2 not including the calipers. We are talking on paper a potential 3 tenths.

Front brakes on a modern vehicle do 60ish% of the braking not 70-80 like a few people have said. With rear disks and modern proportioning it is much closer to 50/50 in many vehicles. Hence the reason rears have disks now and they often are vented just like front rotors.

Evey one is just freaking out and not looking at the logic. My truck is factory rated to 9000 lbs. Event at 70/30 that means the fronts are rated 6300 and the rears are rated for 2700. I pulled a trailer with no brakes and a 1990 Mustang GT on it and it stopped nearly like nothing was there. Obviously the brakes can stop MUCH more then the factory weight capacity. Point being the stopping force is easily there if I were to remove the fronts.

I understand everyones point of a few pounds of prevention(hitting the sand pit) is better then the .2-.3 to be gained.
My point is it could be done without any issue for track use only. People do it all the time at every track across the country on cars that weigh in the 3200ish range, and with brakes that certainly aren't nearly as powerful as the rears of a 2500 pick up. They don't make spindle wheels only for top-fuel dragsters and anything running a spindle wheel doesn't have front brakes. Many have shoots but they don't use them every run depending how fast they are.
your in a 3/4 TRUCK....a SCLB at that....roughly 65% of your curb weight is on the front, slam on the breaks, that turns into roughly 80%...

lets say you do this, ALL your line pressure is going to go to the rears, that will lock them in a heart beat, that WILL get you kicked out the track.

.3 isnt worth the risk imo
james8997 is offline  
Old 10-18-2010, 10:05 PM
  #38  
13 Second Truck Club
iTrader: (10)
 
DV2000NJ's Avatar
 
Join Date: Nov 2009
Location: Central NJ
Posts: 1,102
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by StreetFreak
I think a vw beetle would be more fitting for you. One of the 30hp ones.
One of THOSE might be ok with just rear brakes, all the weight's on the back.
DV2000NJ is offline  
Old 10-18-2010, 10:05 PM
  #39  
Ph.D. in HUBRIS
Thread Starter
iTrader: (10)
 
custm2500's Avatar
 
Join Date: Mar 2009
Posts: 4,087
Likes: 0
Received 5 Likes on 5 Posts
Default

Originally Posted by DV2000NJ
Yeah, the rear brakes have the stopping power, but the issue is that you're going to just lock them up. There is NO weight over the rear of your truck.

Go try to stop from 20mph with just your parking brake.
You would be suprised. Most of my weight taken out of the truck has been from the middle of the cab forward. So the truck probably started 60/40 front to rear and is probably 55/45 now. Also event under hard braking the truck doesn't nose dive so not much weight gets transfered under braking.

Don't forget I am bagged so at the stripe I inflat the fronts and then I am going up hill and will slow much faster!! haha Sorry lame as hell but it is an old classic.
custm2500 is offline  
Old 10-18-2010, 10:07 PM
  #40  
Teching In
 
StreetFreak's Avatar
 
Join Date: Feb 2009
Location: Hammond, La
Posts: 16
Likes: 0
Received 1 Like on 1 Post
Default

vw beetle. Sell that truck and buy one.
StreetFreak is offline  


Quick Reply: Front brakes?



All times are GMT -5. The time now is 12:07 PM.