Share Pics of People Hauling or Towing Something Wrong

[Dftodd]

Bruce

That's evil and genius

 

[aczlan]

No it doesn't. All brakes (present) on a trailer required to be applied automatically upon breakway. Nowhere does it state that each axle must have brakes present.

It does in 49CFR571.121 S5.2.2 49 CFR § 571.121 - Standard No. 121; Air brake systems.
S5.2.2 Brake distribution and automatic adjustment. Each vehicle shall be equipped with a service brake system acting on all wheels.

Aaron Z

 

[Chilliwack Murray]

That's evil and genius

F150 is all wrong, that should really be a 1990s Explorer or the S10 type Blazer/Jimmy. They would roll over on their own if you just hurt their feelings.

 

[Chilliwack Murray]

It does in 49CFR571.121 S5.2.2 49 CFR § 571.121 - Standard No. 121; Air brake systems.
S5.2.2 Brake distribution and automatic adjustment. Each vehicle shall be equipped with a service brake system acting on all wheels.

Aaron Z

Not to take sides but that states "service brakes" not emergency (spring) brakes. Even service brakes weren't required on all axles until the 80s. Prior to that most class 8 trucks had no brakes on the front axle to avoid jackknifing.

 

[aczlan]

Not to take sides but that states "service brakes" not emergency (spring) brakes. Even service brakes weren't required on all axles until the 80s. Prior to that most class 8 trucks had no brakes on the front axle to avoid jackknifing.

Look at my last post where they say that all brakes are required to be applied automatically upon breakaway:

That is odd, Regulations Section says "Question 2: Are all brakes on a trailer required to be applied automatically upon breakaway? Guidance: Yes"
That would seem to imply that spring brake cans are required on both axles.

So if all axles are required to have brakes and all brakes on a trailer are required to be applied automatically upon breakaway, any trailer built after that requirement was enacted should have spring cans on all axles.

Aaron Z

 

[Chilliwack Murray]

Fair enough, and to that point I've never seen a trailer that didn't have spring brakes on every axle. Tractors however don't have spring brakes on tag and steering axles. I've never seen a drive axle without spring brakes though.

 

[aczlan]

Fair enough, and to that point I've never seen a trailer that didn't have spring brakes on every axle. Tractors however don't have spring brakes on tag and steering axles. I've never seen a drive axle without spring brakes though.

Cant disagree with that.

Aaron Z

 

[duramaxsky]

None of our tandem axle tractors from the last several years have spring brakes on the front drive axle. The last 2 years with drum brakes and all of the disc bake units. I looked at them yesterday.

 

[4570Man]

Fair enough, and to that point I've never seen a trailer that didn't have spring brakes on every axle. Tractors however don't have spring brakes on tag and steering axles. I've never seen a drive axle without spring brakes though.

Same here. It’s almost guaranteed that a standard 5 axel semi will have 4 axels with spring brakes. Both drives and both trailer axels.

 

[SouthernSky]