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Old 07-08-2019, 01:40 PM   #1
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Which rear brake diaphragms

Iím pretty sure my rear brake diaphragms are going bad.. I can hear them hissing when applied at a stop light etc, and the compressor seems to run a lot. So Iím planning on changing them out. I called the international dealership and they told me I need ď30sĒ in the rear. The problem is I donít know if I need 30s with 2.5Ē stroke (seems standard) or 3Ē long stroke diaphragms assemblyís? Anyone know how to tell which diaphragms I need?

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Old 07-08-2019, 03:15 PM   #2
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You will have to look at the brake chambers to determine if it's standard or long stroke. If your bus is older, it's most likely standard. Long stroke chambers have square nipples where the air hoses connect. Got a pic of yours so we can verify?
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Old 07-09-2019, 06:22 AM   #3
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IMG_5751.jpgIMG_5752.jpgIMG_5755.jpgIMG_5756.jpg

Thanks!
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Old 07-09-2019, 06:44 AM   #4
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Looks like long stroke chambers to me.
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Old 07-09-2019, 07:01 AM   #5
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Thanks I really appreciate it!
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Old 07-10-2019, 06:15 PM   #6
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Turns out itís actually the front brake thatís leaking. Refer to the pictures below. So I need to figure out what part it is also. IMG_5791.jpgIMG_5792.jpgIMG_5790.jpg
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Old 07-10-2019, 07:03 PM   #7
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Can't tell for sure, but looks like Type 24 chamber maybe? There is no long or short stroke on steer axle single can brakes.
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Old 07-12-2019, 06:22 AM   #8
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The brake chambers should have an ID plate on them that tell you the make and part number to get replacements. On the front service chambers, if not rusted up, you can easily change the diaphrams and save a good bi of money. Rears (spring brake) are another story altogether and should be changed as a complete assembly. DO NOT try to service a spring brake chamber!!
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Old 07-12-2019, 02:53 PM   #9
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Thanks! I changed the fronts(which were leaking at least in the drivers side). And your right the old brakes did have a tag indicating the type. I havenít changed the rear ones yet. Should I wait till I get a leak or change all of them out together?
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Old 07-12-2019, 03:15 PM   #10
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You kinda need to know what you are doing so not to hurt yourself.
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