Changing Brake Chamber Size

[Yauchout]

(11-04-2025 )4ways Wrote:  The LT625 I’m driving has the 18/24D (Disk) standard stroke brake chambers on the drive axles. The mechanic says I have air back feeding through the rear quick release valve when I’m pressing the foot brake. I have disassembled the QRV and didn’t see anything wrong with it. I’m replacing the QRV with new but thinking a brake chamber might be back feeding so I will be carrying a spare until it does it again (It stopped back feeding before he could show me but he is a trusted mechanic).

So these brake chambers (18/24D) are hard to find and I’ve had problems before when they were hard to find while I was OTR and broke down with shops saying they might not be able to find one locally.

I’d gladly replace 2 or all 4 at the same time to a more common 30/30 size but I don’t know if I can do that. I know I can’t mix and match on the same axle but not sure if I’d have to replace only 2 at a time or all drive cans (4) or possibly the steers as well.

Thanks in advance

a 30/30 is a drum brake chamber and will not work with disks, your options are a 18/24 or a 20/24 (20/24 being the long stroke option) for disk... the complete axle must match so if you go to a 20/24 on the left front drive the right front drive must be replaced with a matching stroke at the same time...