Brake pod mixing

[Truelove]

My truck crane has 30/30 and 40/40 pods mixed on both drive axles, and are on alternate sides. 

You guys ever seen an application like this, or are they just replacements?

Thanks

[cruiseliner64]

Replacements id say.if you have 30/30 on one side and 40/40 on the other side of the same axle you will have a brake imbalance.it would never pass a safety inspection here in Ireland.... 

Paul

[Geoff Weeks]

I have never heard of or seen a #40 brake chamber. #36 is the largest in common use, and even they are not common.

Got a "hit" for type 50 rotochamber, but nothing for a 40. 

Edited Tuesday at 09:00 PM by Geoff Weeks

[Joey Mack]

axles need to have matiching brake components across them..  These guy's told you right..  Jojo

[fjh]

36 is common on mixer’s here du to the weight it’s ok to have one axle bigger but not one for on each! That said your safer with all  the same on all drivers are best! Steer axle brakes Must have matched pods even if you have roto chamber they must be both roto by our rules here! Common to have 24 on the front sometimes 20!As a side note long stroke pots are not inter mix able here either even though they are 30/30  0r 24/24 dumb but true!my belief is that every thing should have long stroke pots period!

[MACKS]

13 minutes ago, fjh said:

36 is common on mixer’s here du to the weight it’s ok to have one axle bigger but not one for on each! That said your safer with all  the same on all drivers are best! Steer axle brakes Must have matched pods even if you have roto chamber they must be both roto by our rules here! Common to have 24 on the front sometimes 20!As a side note long stroke pots are not inter mix able here either even though they are 30/30  0r 24/24 dumb but true!my belief is that every thing should have long stroke pots period!

Never knew they even made different stroke lengths for the 30/30 chambers..

[Mark T]

1 minute ago, MACKS said:

Never knew they even made different stroke lengths for the 30/30 chambers..

Most long strokes have a square form around the ports for the air ( service and spring )  Geometry is all different for regular and long stroke. They make'm though.

[Joey Mack]

Macks, there are 2 1/2'' and 3'' maxi's..  the 3'' one's can be identified buy square cut ports for the air lines,,,  just in case you can read the lable or whatever...  Jojo

[MACKS]

16 minutes ago, Joey Mack said:

Macks, there are 2 1/2'' and 3'' maxi's..  the 3'' one's can be identified buy square cut ports for the air lines,,,  just in case you can read the lable or whatever...  Jojo

I know 24 cans are long or short but the 30 are just one length right..

[Joey Mack]

the rod length is not the issue here,  ther are many laengths of rods,,  the stroke of the plunger in the diaphragm is where the difference is.  the actual movement of the rod..   you can also see that the center section of the brake chamber is wider too..

[Joey Mack]

I meant to say longer..  the whole unit is longer..  

[Mark T]

30 minutes ago, MACKS said:

I know 24 cans are long or short but the 30 are just one length right..

No 

[Mark T]

Air chambers can be confusing since there's so many different ones that have become popular.

[MACKS]

11 hours ago, Mark T said:

No 

Ok my bad,never heard anybody ask for a short stroke  30 at the parts store,our local Mack dealer has a huge cardboard box on the floor 6x6 filled with brake chambers all long stroke,I’ve just been grabbing them from there as long as. I can rember..

[mechohaulic]

13 hours ago, Joey Mack said:

the rod length is not the issue here,  ther are many laengths of rods,,  the stroke of the plunger in the diaphragm is where the difference is.  the actual movement of the rod..   you can also see that the center section of the brake chamber is wider too..

the diaphragm is the most important component to the long/short stroke chamber,  2 1/2 vs 3 diaphragm side by side show considerable  difference in height. not good to put a 2 1/2 in a long stroke chamber. have seen the pressure blow apart the diaphragm from pushing it further then manufactured for.

[fjh]

13 hours ago, MACKS said:

I know 24 cans are long or short but the 30 are just one length right..

The best identifier is the square port as mentioned  and No as mentioned! 30/30 is the most common these days on drum brakes ! Im not sure what they are using on the Disc  stuff as Im well removed from the business these days thankfully ! They look like 20/20 or 24/24 !

[Mark T]

9 hours ago, fjh said:

The best identifier is the square port as mentioned  and No as mentioned! 30/30 is the most common these days on drum brakes ! Im not sure what they are using on the Disc  stuff as Im well removed from the business these days thankfully ! They look like 20/20 or 24/24 !

Discs are a whole other size. I'm learning about this lately.  Just changed some on my T880, they're like 24/18s or something.  Really need to pay attention anymore. Mix'n anything is a fast way to no brakes.