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Heavy duty drilled or Slotted Rotors on trucks?

Discussion in 'Trucks and Trailers' started by AWJ Services, Apr 19, 2011.

  1. AWJ Services

    AWJ Services LawnSite Platinum Member
    from Ga
    Messages: 4,281

    Have any of you had any better service out of the drilled or slotted rotors and high performance pads in a heavy towing application?
  2. unkownfl

    unkownfl LawnSite Gold Member
    Messages: 3,837

    Slotted would be the way to go. With too many heat cycles drilled tend to crack.
  3. SDelPrete

    SDelPrete LawnSite Member
    Messages: 74

    either are a waste of money for a truck...if you want better braking get a better brake pad compound
  4. PTSolutions

    PTSolutions LawnSite Silver Member
    from OH
    Messages: 2,331

    i ran a powerslot rotor & hawk hps pads combo on our 02 chevy HD and got great braking out of it, especially when they warmed up a bit. though they didnt last very long, the pad came off the backing on the hawks.

    that truck has been through brakes like popcorn...
  5. ParkWelding

    ParkWelding LawnSite Member
    Messages: 182

    I would second the "drilled rotors will tend to crack" theory with cast iron rotors. I've tried a ton of different rotors and pads on a few different 3/4 ton trucks. In my application, the most cost effective way to keep brakes on the trucks is the cheap chinese rotors and good pads made for heavy use. Not "performance" brand or name brand pads though. Yep they get changed pretty often, but fancy pads and rotors haven't lasted long enough or stopped much better, to be worth it.

    Definitely not HAWK pads. Yuck.
  6. AWJ Services

    AWJ Services LawnSite Platinum Member
    from Ga
    Messages: 4,281

    I usually do the cheap rotors and Carbon Friction metallics pads every year but I was thinking maybe a better rotor and pad would help.

    I had good luck on Cyrogenic treated slotted rotors years ago on Explorers so it got me thinking.
  7. Chris McCrary

    Chris McCrary LawnSite Member
    Messages: 25

    A big brake kit is the only thing thats going to help really. Need more surface area. If you can get bigger rotors/calipers that will help. Doesnt have to be fancy. There is a reason you see 14" brakes on todays high performance cars.
  8. Knight511

    Knight511 LawnSite Member
    Messages: 207

    drilled or slotted are a waste on a truck hauling a trailer. Your biggest enemy on your truck brakes is HEAT. When you drill or slot rotors, you are taking mass away. Less mass means the disc can hold less heat and the brakes will not stop as well.

    If you want to improve braking performance, getting stickier tires. No matter how big and bad you brakes are, crap-ass truck tires don't have enough traction on pavement to stop the truck. You can only stop as fast as you tires will let you.

    Next in line is to replace the pads themselves with a compound that has more stopping power. This comes with more dust and shorter life.

    Next (and cheapest possibly) is to route some ducting from the front bumper area (with a scoop) to just behind the rotor to actually cool the rotor.

    And before you say it, cross-drilled and/or slotted do NOT help cool the brakes... they allow gases to escape and modern street pads do NOT emit very much of this gas. Your truck is not a race car with race tires, race brakes and a need to stop from 150mph... ;)
  9. topsites

    topsites LawnSite Fanatic
    Messages: 21,653

    Using the brakes wastes gasoline – you’re effectively turning it into brake dust.
    And of course, the brake hardware itself.
    New pads: $25 a set.
    New rotors: $100 each.
    Money wasted: $250 per set of two, $500 for all four brakes completely new pads and rotors.

    Learn to drive without brakes (aka driving with load), not only does it make your pads last forever (think 100,000 miles
    without having to replace brakes) but your tires last longer and it's a real boost to fuel economy.

    Drive Without Brakes: Eco-Driving

    No brakes improve fuel economy

    Driving without brakes always makes me to think of the free fall and the roller coaster ride where there is no break during the fall. This is actually a good technique that will save you a lot of fuel when followed with cars in heavy traffic. The basic idea is to conserve the momentum, which is built by burning gas.

    Lets take an example, you drive to attain 60 miles/hr by burning gas. Now suddenly the traffic slows down and you apply brakes to come down to 30 mph. Later, the traffic speeds up and you accelerate back to 60 mph. How many times does this happen daily while driving? What if you had to go to 60 mph only once? This would save the fuel used to go from 40 mph to 60 mph.

    This is the concept of DWB.

    Now, what would you do if you were happen to drive without brakes? First, you would look for enough space between you and the driver ahead. Next, you would look on to the drivers ahead of you keenly, maintaining a good space in between. Thirdly, you would look for the brake lights of few or more drivers ahead of you to slow down without applying brakes. For this you would need to drive the car with less acceleration so that you don’t need to apply breaks frequently. Do not accelerate when you think that the cars in front of you are going to slow down. So by the time when you are again accelerating, the vehicles ahead of you would start to have accelerated before you start catching up with them.

    The same thing applies for city driving. Watch the lights and try not to use your brakes. Slowing down is pretty much inevitable, but minimizing brake use can greatly increase your gas mileage.

    The point is, if you know your going to have to slow down at any point, stop accelerating as soon as possible and start coasting.
    By using the brakes you are wasting gas – you’re effectively turning it into brake dust.

    This may sound like common sense, but so many drivers neglect to do this day in and day out. Just think about how much gas is wasted when you see brake lights going to work tomorrow. It’s amazing how much fuel could be saved with this technique alone.
    Last edited: Apr 26, 2011

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