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Brake chambers for XL
Looking to do my brake chambers on my XL.
I believe the fronts are T30. The drive is 30/36 and tag isn’t the harder to find 16/24. Found these online. Is this the correct 16/24 brake chambers ?
https://www.anythingtruck.com/product/370-04454115860.html
questions –
-are our brake chambers long rod or Clevis ? I think it’s not a Clevis but trying to confirm
-are their 2 chambers on the drive or 4 ? I’ve seen posts with people posting 6 and 8
-are the brake chambers normal stroke length or long stroke length ?
thanks
Ed
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12 Replies
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Hard to correctly answer without knowing details about the coach such as year, model.
My 97 had the sizes you mention and if had disc brakes on the steer and tag, drums on the drive.
It had self adjusting slack adjusters and the brake chambers had long threaded rods I cut to length. At the time 16/24 was not available over the counter, but I could get a 16/24 piggyback and a separate 16 that I used to build the 16/24 combo.
I never bought the brake chambers of that type from Prevost because their price was about 3X or more than what the truck parts places were selling them for.
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I did mine last year 97 XL Steer replaced Diaphragms Type #30, Drives replaced the piggybacks and service Diaphragms GP3036 and a DP type #30 Diaphragms,Tags also replaced Piggybacks GP1624 and a DP16 Type #16 Diaphragms also a Type # 36 for lifting the tags. Also Check all rubber brake hoses I had a bubble in 1 of mine so I replaced all 8 of them. from Prevost https://www.finditparts.com/ https://www.finditparts.com/products/367963/haldex-gp3036
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Sorry guys. Mine is a 93 chassis XL. 94 Liberty classic.
Trying to acquire the units outside of Prevost parts and just trying to get the right parts before either me attempting some or taking it to the local truck service center and having them do it. Knowing at least two of the parts arent as common, trying to make sure I have the right parts to hand to them.
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Like Art, I used to rebuild my brake chambers, back in the day when you could replace the spring brake diaphragm, but I never got the life from the ones I rebuilt so I started buying them from truck parts places like Fleet Pride or Truck Pro.
The reason I asked about coach information was because my 87 40 footer did not have a parking brake on the tag, apparently your 93 does, and that is a good thing. I am assuming though you have drums so verify chamber sizes.
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So prevost parts got back to me. They say you only need a type 16 unless you have an emergency brake. I have a parking brake but is that the emergency brake or is that separate from the parking brake ( which I guess technically could be used as an emergency brake ).
anyhow if you have the emergency brake – then it’s a 16/24 unit. If you don’t it’s a straight type 16. Not sure how i determine if I have an emergency brake or whether the parking brake is the emergency brake. And the parts from provost are side specific for the 16/24.
But still looking to get haldex or Euclid replacement chambers just need to know if they are regular or long throw and or whether they use Clevis pin attachment (which they don’t appear to be)
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Ed, please excuse my comments if they offend you, but working on brakes is a serious activity, and before even considering doing the work I would presume an owner would have poked his nose under the coach to see what there is to see.
Right off the bat doing that reveals the type and size of the brake chambers. It reveals if you have spring brakes on just the drive or on the tag also.
That visual review, combined with a standard DOT brake check, and a helper to apply brakes while someone watches shows travel (assuming the slack adjusters have been adjusted) so while those of us who have done brake work can provide some information and advice none of what we say is valid unless you personally have verified it.
I have never shopped for a specific brand of brake chambers. I know Bendix disagrees, but to me they seem to be generic and as a cheapskate I am OK pulling $25 type 30’s from the big carton sitting in the middle of the floor at the truck parts store.
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and jon, totally agree. I’m 99% certain going to take it to professionals to go and do. But because of the age of the coach and not it having some brake chamber parts that are NOT readily available, Im just trying to get the parts together for them to have it when I take it in. Rather than taking it, they disassemble it and need a week to get a semi-rare brake chamber part before proceeding (especially since brake chambers are kind of bulky and not something you want to air in) just to get the parts in.
So not trying to get to the point of DIY. Just trying to get things together for someone to do. Now, if I was within 300 miles of a PRevost center, that might be a bit different.
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Ed,
I am trying to remember the details of my 87 coach with respect to brake chambers so take the sizes and comments with a grain of salt.
Availability of brake chambers on that coach was excellent. I know for sure the steers were type 30, the drives were 30/36, and the tag was a 24 or 27, not a combo.
You can easily determine if the tags are spring or just a single service brake by laying on the ground and looking across at the tag chamber on the other side.
As I recall a parts store either had all the chambers in stock or had them overnight.
If I were to have a shop do the brake chamber replacement it is a one day job. On a coach your age they are or should look at hoses and maybe consider replacing any showing their age. If you have all drum as I suspect they should inspect the shoes and linings and drums for thickness and evidence of cracking of drums or friction material. Their final task is going to be adjusting the slack adjusters which is a minute per wheel. I would not anticipate problems with S cam bushings, but would make sure the brakes have not been compromised with leaky hub seals or broken return springs.
If you bring your coach to the shop doing the repairs and ask them to figure out what parts they need along with other work they determine needs done as a result of the inspection the work you require should be a one day job or maybe a second if they find upon inspection some other needed work.
Most shops have a policy about not using customer supplied parts, not because they want to cheat you, but because they want to be sure the parts are correct. They don’t want to tie up their shop or lift waiting to get the right parts.
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Jon thanks for the reply. Prevost says the coach left with a type 16 in the tag. And chances are it wasn’t modified to a 16/24. But many coaches maybe later had the 16/24. That would simplify things – type 30 up front, 30/36 in drive and 16 in the tag.
I use the local carter/caterpillar to service the coach. They don’t mind having the right parts on hand and if it doesn’t work – they will tell me and I usually have them order it. The Detroit diesel shop here will do the same since it isn’t parts they always readily stock. If it’s Detroit parts – then I usually have the Detroit handle it. The carter/cat guys frequently don’t stock Prevost’s specific parts but the brake stuff might be different. I use them because they arrive two other local coach companies that have prevost in their inventory (albeit the newer h3’s).
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Ed,
Add a signature so folks can respond with like year and converter.
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I did my brakes, etc. Here’s the LINK
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It’s easy to replace the diaphragm on the service side of all brake chambers. The manufacturer makes the parking side non-serviceable and for a good reason. The only time I would replace the service diaphragm on a parking brake is a temporary fix. Replace it all. If the service side needs replaced the parking side is probably in the same condition. Be sure and cage parking brake chambers before removing.
2000 Featherlite H3-45
2024 Jeep Grand Cherokee
Leesburg, FL
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