Good Sam Club Open Roads Forum: Tow Vehicles: Front brakes
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Grit dog

Black Diamond, WA

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Posted: 02/07/22 10:00am Link  |  Quote  |  Print  |  Notify Moderator

mkirsch wrote:

Grit dog wrote:

RoyJ wrote:

The front brakes more under HEAVY braking. The proportioning valve assumes enough weight transfer has occurred and send more hydraulic pressure forward. Under light braking, most modern trucks/cars use the rears more.

Now if the fronts are actually cold / lukewarm, there might be a problem.

Have you tried hard (threshold of ABS) braking and then carefully feel the front for increased heat?

scroll up 2 posts. OP said his brakes work fine.


Then why in hell did he ask the question in the first place?


Exactly!
But what I gathered from his cryptic first post was that he slapped now pads on all 4 corners and 1 or 2 new rotors in back. And then drove it around the block once, stuck his finger on each brake and found that the one(s) with the most friction with new rotors were warmer.


2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
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RoyJ

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Posted: 02/07/22 05:55pm Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

There's a reason that front brakes are never smaller or less capable and generally always larger with more stopping force than rear brakes on ALL vehicles.


On LIGHT vehicles / trucks.

Starting in Class 4 / 5, rear brakes starts to match or slightly exceed the fronts. Ram 5500s have 15.5" rear disks IIRC.

Class 7 and above, single / tandem axle dumps, city buses, hwy coaches, tractors, all have significantly more rear braking power than the front. There's a point where weight transfer can't overcome the much heavier rear axle, especially with long wheelbases.

Grit dog

Black Diamond, WA

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Posted: 02/07/22 06:04pm Link  |  Quote  |  Print  |  Notify Moderator

RoyJ wrote:

Grit dog wrote:

There's a reason that front brakes are never smaller or less capable and generally always larger with more stopping force than rear brakes on ALL vehicles.


On LIGHT vehicles / trucks.

Starting in Class 4 / 5, rear brakes starts to match or slightly exceed the fronts. Ram 5500s have 15.5" rear disks IIRC.

Class 7 and above, single / tandem axle dumps, city buses, hwy coaches, tractors, all have significantly more rear braking power than the front. There's a point where weight transfer can't overcome the much heavier rear axle, especially with long wheelbases.


Yup, 10-4, roger that, I agree. This thread was about a 3/4 ton truck though.
My mistake for using the term “all” without context …

* This post was edited 02/07/22 10:42pm by Grit dog *

BurbMan

Indianapolis, IN

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Posted: 02/07/22 06:59pm Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

What I found was during acceleration, if wheel spin was detected, the car would apply braking force to the rear brakes to control minor wheel spin prior to defaulting to traction and stability control engaging.


Excellent point and trucks do that too when the box is unloaded, ie RWD with no weight over the drive wheels. Similar to my point that proportioning valves that use ride height sensors are overusing rear brakes when they sense that the truck is unloaded.

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