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joeheb
Senior Member
121 Posts |
 Posted - 01/23/2013 : 11:52:44 AM
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| 2009 IC 72P bus, just curious as to what you guys have done to repair the popping noise on the front end when the brakes are applied. I've replaced all the front spring bushings and shackles, sometimes that fixes the problem, other times it doesn't. If it doesn't fix the problem then I replace the front shoes even if they have plenty shoe left, one or the other has worked for me. |
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sob
Senior Member
USA
53 Posts |
Posted - 01/23/2013 : 12:32:05 PM
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| Body Mounts ? |
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joeheb
Senior Member
121 Posts |
Posted - 01/23/2013 : 12:44:31 PM
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| Never had any problems with body mounts but I'll definately check those on this next bus. |
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offroadwolf1
Active Member
27 Posts |
Posted - 01/23/2013 : 2:00:29 PM
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| Sounds to me like either misadjusted brakes or worn brake components. I have found a lot of mine with worn s-cam bushings, anchor pins and bushings, and bad slack adjusters. |
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IBTMech
Top Member
USA
960 Posts |
Posted - 01/23/2013 : 3:10:49 PM
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You don't say what type of brakes you have or the mileage on the bus. Popping noises from S-cam brakes isn't unusual. Lubing the anchor pins where they turn in the bushings and the cam rollers where they contact the shoes usually takes care of it. Inspect the camshafts and rollers for any flat spots. Replace if necessary. Do not lubricate where they contact.
I've never had the State Police fail any of my buses because of brake popping noises. It's not abnormal. |
If it doesn't fit, FORCE it.
If it breaks, well, it needed replacing anyway.
Pullin' wrenches for 45 years. |
Edited by - IBTMech on 01/23/2013 3:14:10 PM |
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Mechan1c
Top Member
USA
623 Posts |
Posted - 01/23/2013 : 5:32:11 PM
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| Both the base adjustment, and a few flat-spotted rollers have been issues here. Normally we leave auto slacks alone and let them work, but on some of these we adjusted them up a bit to see if the noise went away and it did. The 3-4 with flat spotted rollers we had to change out using new parts. |
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raytobe
Advanced Member
USA
272 Posts |
Posted - 01/23/2013 : 6:03:00 PM
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| I have the most problems with the REs. Usually, changing the rollers takes care of the problem. With all due respect to the above poster, there's no way I trust the auto-adjust slacks--especially on the rear. Although I will say that over the years they seem to be getting better. |
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57fan
Active Member
United States
49 Posts |
Posted - 01/23/2013 : 8:52:07 PM
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IC has been real good at not lubricating the "S" cams from the assembly line. We have had many dry and rusty cam bushings and cams. Definetly clean and lube up the clevis pins on the slacks. AS for Auto slacks, I hate Gunites with a passion but overall Auto slacks is the only way to go. Plus it is mandatory for the past 15 or so years..
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Lead, Follow or get out of the way! |
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joeheb
Senior Member
121 Posts |
Posted - 01/24/2013 : 06:00:19 AM
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My bad, should've specified types of brakes and mileage. Bus has air brakes and has just over 46000mi. I've never had to lube anchor pins and rollers, won't that attract brake dust? Never had flat spot problems either. What type of lube do you recommend for the pins and rollers? I have replaced many worn S-cam bushings before and fixed the popping noise. Thanks for the tip, it's a cheap start.quote:
Originally posted by IBTMech
You don't say what type of brakes you have or the mileage on the bus. Popping noises from S-cam brakes isn't unusual. Lubing the anchor pins where they turn in the bushings and the cam rollers where they contact the shoes usually takes care of it. Inspect the camshafts and rollers for any flat spots. Replace if necessary. Do not lubricate where they contact.
I've never had the State Police fail any of my buses because of brake popping noises. It's not abnormal.
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joeheb
Senior Member
121 Posts |
Posted - 01/24/2013 : 06:06:13 AM
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Absolutely agree with you about IC not lubing the way they should. First thing we do when we recieve a new IC bus is lube it. They use very little lube to save money I assume.quote:
Originally posted by 57fan
IC has been real good at not lubricating the "S" cams from the assembly line. We have had many dry and rusty cam bushings and cams. Definetly clean and lube up the clevis pins on the slacks. AS for Auto slacks, I hate Gunites with a passion but overall Auto slacks is the only way to go. Plus it is mandatory for the past 15 or so years..
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1983ChevroletWayne
Senior Member
Canada
111 Posts |
Posted - 01/24/2013 : 09:01:10 AM
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Our mechanics here use that brush-able copper anti-seize type stuff on these parts.
Similar to this:
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Formerly "83ChevroletWayne"
Pic by "BS67009" |
Edited by - 1983ChevroletWayne on 01/24/2013 09:07:09 AM |
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Mechan1c
Top Member
USA
623 Posts |
Posted - 01/24/2013 : 10:25:02 AM
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"With all due respect to the above poster, there's no way I trust the auto-adjust slacks--especially on the rear."
No offense taken. I have not had a lot of problems with ASA's. I've been doing this since '86 on buses, and the changes have been dramatic in brake adjustment and lubricants. We prefer Haldex, but the last 50 buses have come with the Meritor slacks and Q+ brakes, and they've held up quite well. We use Mobil syn grease. I purchased 18 2006 C-CE's and and have yet to do a brake reline front or rear. Getting 75K on brakes makes me happy. Full disclosure: We did spec engine brakes. We havent replaced a UJ either! |
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joeheb
Senior Member
121 Posts |
Posted - 01/24/2013 : 11:16:05 AM
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Brought bus in and inspected body mounts, mounts are good, check S-cam bushings, S-cam bushings are good. Took IBTMech advice and lubed anchor and roller pins with anti seize and all is well now, no more popping noise in the front end. Thanks for all the input.
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Topic |
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Front end pops
