Load Sensing Valve Delete?

[GeneralDisorder]

Are the front A1R cans larger than the backs? When checking my brakes I noticed the front shoes showed significantly more wear.
Edit: yes, 5.5"dia for rear, 6"dia for front

Yes but the front only has a single can. Rear wheels have two cans per wheel. Rear brakes are the "primary" in the system and should have more power than the front.

The front shoe wear would tend to be less even since they have only a single can and they only expand from one side of the shoes not both. That is somewhat offset by drum brakes "self energizing" feature but not under light braking.

 

[aw113sgte]

Yes but the front only has a single can. Rear wheels have two cans per wheel. Rear brakes are the "primary" in the system and should have more power than the front.

The front shoe wear would tend to be less even since they have only a single can and they only expand from one side of the shoes not both. That is somewhat offset by drum brakes "self energizing" feature but not under light braking.

Interesting, all that would point to the rear wearing faster, I wonder why the fronts are down more. Truck only has 3,000 miles so I doubt they've replaced any shoes. The wedge mechanisms are in good shape as well.

 

[STI2NR]

Interesting, all that would point to the rear wearing faster, I wonder why the fronts are down more. Truck only has 3,000 miles so I doubt they've replaced any shoes. The wedge mechanisms are in good shape as well.

Your load sensing valve might be blocked off inside like mine was hence I was only using my front brakes the entire time.

 

[Ronmar]

Interesting, all that would point to the rear wearing faster, I wonder why the fronts are down more. Truck only has 3,000 miles so I doubt they've replaced any shoes. The wedge mechanisms are in good shape as well.

Providing everything is aligned correctly and delivering to spec. You need some T fittings and pressure gauges/transducers to confirm the pressure end, the rest is mechanical. Shoe free space(.026” center shoe?). wedges have a limited amount of travel and if the mechanical alignment isn’t right you run out of wedge before you get full shoe force… A symptom of mechanical issue in the rear would be the park brake not wanting to hold the vehicle in gear and even light throttle…

 

[aw113sgte]

Providing everything is aligned correctly and delivering to spec. You need some T fittings and pressure gauges/transducers to confirm the pressure end, the rest is mechanical. Shoe free space(.026” center shoe?). wedges have a limited amount of travel and if the mechanical alignment isn’t right you run out of wedge before you get full shoe force… A symptom of mechanical issue in the rear would be the park brake not wanting to hold the vehicle in gear and even light throttle…

She won't budge with parking brake and full throttle in 1st... so that's good

 

[aw113sgte]

Your load sensing valve might be blocked off inside like mine was hence I was only using my front brakes the entire time.

A1R, no load sensing valve present.

 

[Ronmar]

She won't budge with parking break and full throttle in 1st. so that's good

Thats good, but the ABS modulation valves are inline and could be effecting final output even if ABS is not activated. The only way to confirm this is with T fittings at the cans and pressure transducers looking at the final pressure actually reaching the cans.

 

[coachgeo]

Interesting, all that would point to the rear wearing faster, I wonder why the fronts are down more. Truck only has 3,000 miles so I doubt they've replaced any shoes. The wedge mechanisms are in good shape as well.

not having memorized your setup...... wear on front may be because you have lot more weight on front.. (engine). Definitely case if you have nothing on the back but chassis and bed. Thats not a lot over the rear axle realistically.