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Old 06-24-2022, 10:26 AM   #1
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2007 Classic Hydraulic disc brake pad min thickness

Hi all, I have been looking all over but canít find the info. Does anyone know at what thickness the pads should be replaced. The pads are about 5/16Ē thick now.

It is a 5000# Dexter Axle 410875-17 (airstream part number)

If anyone can link me to some information I would appreciate it.

Cheers
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Old 06-24-2022, 11:45 AM   #2
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In automotive applications there is a wear groove. (Like a tire wear bar) When the pad is worn enough the groove no longer exists, time for replacement and addressing the rotor surface.

An older method would be to replace when the friction material thickness is just less than the metal backing thickness of the pad.

Action
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Old 06-24-2022, 04:39 PM   #3
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Thanks Action. Do you know approximately how thick a new pad is?

Quote:
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In automotive applications there is a wear groove. (Like a tire wear bar) When the pad is worn enough the groove no longer exists, time for replacement and addressing the rotor surface.

An older method would be to replace when the friction material thickness is just less than the metal backing thickness of the pad.

Action
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Old 06-24-2022, 05:27 PM   #4
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On a car - about 3 to 4 times the thickness of the metal plate for the pad.

This can vary some based on who is manufacturing the disc brake pad.

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Old 06-24-2022, 05:31 PM   #5
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Sky,

2007 Classic Slide Out owner here and born a Buckeye.

I just measured the thickness of the friction material on my collection of used pads. Thickest was .380". If you look at the link, you might be able to contact Dexter and ask or etrailer might be a shot too.

https://www.dexteraxle.com/product/2...eplacement-kit

Sorry no new one to check. That pic the rotor doesn't look like it was being asked to do much based on surface condition. Any more brake issues to report? I've done almost everything to mine due to the old short brake hose recall even rebuilding calipers.

You have the baddest brakes that was ever put on an Airstream they should really be doing a job for you. Mine are.

Gary
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Old 06-25-2022, 09:23 AM   #6
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Thanks Gary, Go Bucks.

How did you determine what axle you have so you could order parts? My Airstream parts manual says its a 5000# axle. The Dexter Booklet I received with the trailer does not have a 5000# disc brake axle in it. Dexter says the axle number is in the middle and back side of axle, but I have gray/black tanks jammed against mine.

Why is this so hard, or am I an idiot?
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Old 06-25-2022, 09:26 AM   #7
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Quote:
Originally Posted by Sky View Post
Thanks Gary, Go Bucks.

How did you determine what axle you have so you could order parts? My Airstream parts manual says its a 5000# axle. The Dexter Booklet I received with the trailer does not have a 5000# disc brake axle in it. Dexter says the axle number is in the middle and beck side of axle, but I have gray/black tanks jammed against mine.

Why is this so hard, or am I an idiot?
I was told by DEXTER rep, that they never produced a 5k axle. AS spec'ed a 5k axle and Dexter labelled them as such to match the GVWR of the trailer. Our axles are in actuality 6k axles.
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Old 06-25-2022, 09:32 AM   #8
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This is the label you are looking for....but I am sure it has degraded so as to be illegible. It was probably curbside front on the axle tube.

If you call AS with your VIN, they may be able to give you the info. With this label, Dexter knows exactly the specs and build of your axles.
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Old 06-25-2022, 09:39 AM   #9
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Sky,

Dexter has a serious library of docs. This is one page of 122 pages in their Light Duty Catalog 600-8000 Lbs. Axle Capacity.

https://www.dexteraxle.com/Resources...mation-Center/
https://www.dexteraxle.com/user_area...ice_manual.pdf

Gary

Not the college Buckeye type, just an Ohio guy that fly's the Ohio burgee on his rig. And it gets lots of questions!
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Old 06-25-2022, 02:46 PM   #10
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Thanks guys, I went ahead and ordered the K71-629 pads.
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Old 06-25-2022, 03:40 PM   #11
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Sky,

If you could please measure the friction material thickness and post it. That can help future queries.


For my rig each year I pull the wheels and pads to clean the caliper anchor to pad surfaces of crud and any rust then apply a light film of brake pad grease to those surfaces.


Gary
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Old 06-25-2022, 03:49 PM   #12
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Sky,

If you could please measure the friction material thickness and post it. That can help future queries.


For my rig each year I pull the wheels and pads to clean the caliper anchor to pad surfaces of crud and any rust then apply a light film of brake pad grease to those surfaces.


Gary
Both the old and the new thicknesses, please. Maybe your best guestimate on miles on the old pads. I have 67,000 miles (per hubometer) and last rotation it appeared I have a good 40 - 50% left????
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Old 07-01-2022, 11:52 AM   #13
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The new pads came in and here are the numbers:

New Dexter K71-629 pad thickness = 3/8"
Old Dexter pad thickness = 5/16"
Trailer mileage = 70,000 miles

I appears I wasted $500, but at least the effort has shown me I need new caliper seals.
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Old 07-01-2022, 12:11 PM   #14
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Sky,

If you'd like some been there done that info, send me a PM and I can save you a few Band-Aids and a bunch of DOT 3/4. Even pics!

Gary
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Old 07-01-2022, 02:17 PM   #15
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Sky,

If you'd like some been there done that info, send me a PM and I can save you a few Band-Aids and a bunch of DOT 3/4. Even pics!

Gary
Sissy! Post for everyone!

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Old 07-01-2022, 02:18 PM   #16
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Quote:
Originally Posted by Sky View Post
The new pads came in and here are the numbers:



New Dexter K71-629 pad thickness = 3/8"

Old Dexter pad thickness = 5/16"

Trailer mileage = 70,000 miles



I appears I wasted $500, but at least the effort has shown me I need new caliper seals.
Yeah, these pads are a really high metallic content. Wear, literally, like iron. But mine are noisy as all git out. They squeal like a piggy!!!!!

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Old 07-01-2022, 07:31 PM   #17
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Quote:
Originally Posted by Sky View Post
The new pads came in and here are the numbers:

New Dexter K71-629 pad thickness = 3/8"
Old Dexter pad thickness = 5/16"
Trailer mileage = 70,000 miles

I appears I wasted $500, but at least the effort has shown me I need new caliper seals.
Looks like the metal is 1/4"
Which is the point that when the friction material gets, I consider replacing the pads.

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Old 07-02-2022, 11:58 AM   #18
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Quote:
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Hi all, I have been looking all over but canít find the info. Does anyone know at what thickness the pads should be replaced. The pads are about 5/16Ē thick now.



It is a 5000# Dexter Axle 410875-17 (airstream part number)



If anyone can link me to some information I would appreciate it.



Cheers


I see youíve already replaced the pads.

I do brake work on my cars regularly. Those pads looked great to me, but the rotors look rough. Someone else mentioned that the pads have a high metallic content and are ver long wearing, but this tends to come at the expense the rotors.

Rotors also have a minimum thickness and this should be marked on them. You may need to buy a cheap caliper from a store like Harbor Freight to measure them.
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