chevytaHOE5674
Well-known member
They have increased the size of the brakes because they have increased the towing capacity from 10k lbs in 2000 to 22k lbs in 2024.
Backyard grassers must have come to the sale.
- Thread starter gcreekrch
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wbvs58
Well-known member
I thought the move to bigger rims was to accommodate the trend for lower profile tires so as to keep the overall diameter much the same.
Ken
Ken
Little Joe
Well-known member
Actually the opposite is true thicker rotors hold temperature longer then thinner rotors . That's why high performance and some after marker rotors have groves cut in them. To reduce overall metal mass and increase air flow around and in the rotor to reduce heat build up since air dissipates heat far better then metal.
Go measure the brake calipers on the rear of a 2015 or later 3/4 ton or bigger truck. They are larger than those on a pre 2005 pickup. When factory tires on most pickups changed to 17 inch I believe around 2007-8 many were pissed because that meant the could no longer use their takeoffs on their farm equipment and trailers and many tried to revert to 16 inch stock wheels . It is not and wasn't possible. Why ? Because 16 inch wheels won't fit over the rear calipers.
While thermal capacity is one consideration taken into account for calculating stopping force it is not the primary factor.
The primary factor is the coefficient of friction.
Federal law mandates that vehicles must come to a stop from a certain speed in a certain distance.
Larger pistons within the caliper are one way of increasing the friction applied to the rotor from the brake pad to provide the needed force to stop the vehicle within the required distance.
Another push to rear disc brakes was the federal mandates of four wheel abs.
Abs is possible with front disc rear drum. But it was difficult if not impossible for most manufacturers to meet the requirements with rear drum brakes and it be financially viable!
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Silver
Well-known member
So you are claiming rotor size has not increased??
Brake calipers do not significantly stick up above the rotor, no matter the size of the caliper. Go take a wheel off and have a look.
The thickness of the rotor is offset by increased diameter with regards to cooling. This isn't rocket surgery, if you take the time and use your Googler I'm sure you will discover this.
Brake calipers do not significantly stick up above the rotor, no matter the size of the caliper. Go take a wheel off and have a look.
The thickness of the rotor is offset by increased diameter with regards to cooling. This isn't rocket surgery, if you take the time and use your Googler I'm sure you will discover this.
chevytaHOE5674
Well-known member
Correct larger brakes necessitated 17" wheels. Guys may have been mad about that until they found out a new 1/2 ton will legally tow what their old 3/4 would or more. Or they hooked 25k lbs of hay behind their 3/4 ton and felt confident they could stop it.
Maybe if you used one of them there measurement doohickey thingamobobs you would understand that calipers extend above the rotors more than 2 inches. Much more in some applications.
If you use the googley thingomobber you will find that rotor thickness has decreased not increased. You will also find the best rotors for dissipating heat are the thinner ones with groves machined into them to increase heat dissipation. You would also find out that the majority of braking occurs at the rear wheels not the front . So more stoping force must be applied to the rear than the front. Most brake systems also apply pressure to the rear axle prior to the front axle.
Don't need the googley thing to tell me what I did daily for over 30 plus years.
chevytaHOE5674
Well-known member
60-80% of braking is front tires....
And fronts act sooner. Not uncommon to wear 2 sets of front pads for every set of rears.
And fronts act sooner. Not uncommon to wear 2 sets of front pads for every set of rears.
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Silver
Well-known member
Little Joe
Well-known member
That was my thinking, I wear out more front pads than rear.
Funny thing drum brakes don't require calipers . And the required space between brake drum and wheel is smaller then the area of required space between rotor and wheel because a caliper has to be Inbetween the rotor and the wheel.
Federal regulations such as reduced stoping distance , four wheel abs among others lead to vehicle manufacturers moving from rear drum to rear disc brakes.
More stopping force is applied to the rear axle of a vehicle then the front axle to maintain steerability . Increased stopping force required bigger pistons in the rear calipers. It is common to have smaller calipers and brake pads on the front axle of pickups and larger vehicles then the rear axle . Some may have same size front and rear but not smaller on the rear.
Basic science says increased stopping requires increased force and or increased stopping surface. Not hard to understand most stopping force is applied to rear axle . So more stopping force is required at rear axle then front axle. Only so many ways to increase that force .
Leading to larger calipers on rear . Meaning bigger wheels to be allow for more larger calipers.
Federal regulations such as reduced stoping distance , four wheel abs among others lead to vehicle manufacturers moving from rear drum to rear disc brakes.
More stopping force is applied to the rear axle of a vehicle then the front axle to maintain steerability . Increased stopping force required bigger pistons in the rear calipers. It is common to have smaller calipers and brake pads on the front axle of pickups and larger vehicles then the rear axle . Some may have same size front and rear but not smaller on the rear.
Basic science says increased stopping requires increased force and or increased stopping surface. Not hard to understand most stopping force is applied to rear axle . So more stopping force is required at rear axle then front axle. Only so many ways to increase that force .
Leading to larger calipers on rear . Meaning bigger wheels to be allow for more larger calipers.
Travlr
Well-known member
NO WE WON"T!!!
YES WE WILL!!
MurraysMutts
Well-known member
Hey you stay outta this.Sheesh, open a thread about grass market and you guys talk about trucks…… No wonder the world is the way it is…
This thread is about brakes. And wheels. And thingy-ma-bobs.
Doo-hickeys too.
CowboyRam
Well-known member
I was thinking this thread was turning into He said, she said.Sheesh, open a thread about grass market and you guys talk about trucks…… No wonder the world is the way it is…
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MurraysMutts
Well-known member
Don't make me bring my goat too!!
I didn't get to watch many calves sell today. But the ones I did see, were pretty darn expensive. I think the supply chain ain't keeping up! Too many calf factories sent to slaughter.
Crazy thing was, lots of nice 2 to 5 year old pairs from 2200 to 2750. 1100lb pairs. Not big cows but that's still down a bit from where we were a few weeks ago.
I didn't get to watch many calves sell today. But the ones I did see, were pretty darn expensive. I think the supply chain ain't keeping up! Too many calf factories sent to slaughter.
Crazy thing was, lots of nice 2 to 5 year old pairs from 2200 to 2750. 1100lb pairs. Not big cows but that's still down a bit from where we were a few weeks ago.
