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02-17-2020, 09:37 AM
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#1
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Senior Member
Join Date: Nov 2010
Posts: 386
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ABS brakes, 2002 front brakes dont activate same time
Both wheels dont brake at same time. Jerks wheel left then right during hard stop. Or vice versa....
Anyone else experience the same? Modulator or....?
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02 Allegro Bus. Freightliner
ISC 350 Cummins
2019 Chev Colorado
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02-17-2020, 09:51 AM
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#2
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Community Administrator
Tiffin Owners Club
Join Date: Sep 2013
Location: DFW, Texas
Posts: 21,562
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How long since you had the brakes serviced? It sounds like it could be a S cam sticking on one or both brakes.
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 2017 Phaeton 40IH XSH Maroon Coral - Power Glide Chassis with IFS
Previous '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
'16 Jeep JKU Wrangler Sahara or '08 Honda Goldwing
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02-17-2020, 10:34 AM
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#3
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Senior Member
Join Date: Jul 2014
Posts: 35,441
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Is the ABS poping off when you stop hard.
If not, like mentioned, its time for a checkup on the front brakes. S cams, slack adjuster self adjuster function, even brake shoe condition.
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02-17-2020, 02:04 PM
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#4
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Senior Member
Join Date: Nov 2010
Posts: 386
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Every shop ive been to with the complaint has adjusted and replaced everything else, but never taken the drums off. During test drives to recreate the situation at those times it didnt happen again. I have always suspected the S cams, but rather than insist on drum removals i cringe at the cost and bite my tongue.
It doesnt happen all the time obviously, only those rare occasions.
Before committing to the drum removal, i thought i would fish for others that may have experienced the same.
From one Lt. Dan to another, thanks for the input, enjoy you and twinboat on the forums.
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02 Allegro Bus. Freightliner
ISC 350 Cummins
2019 Chev Colorado
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02-17-2020, 02:46 PM
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#5
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Senior Member
Join Date: Nov 2010
Posts: 386
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Twinboat,
Yes the ABS does pops off when braking hard.
__________________
02 Allegro Bus. Freightliner
ISC 350 Cummins
2019 Chev Colorado
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02-17-2020, 02:58 PM
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#6
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Senior Member
Join Date: Jul 2014
Posts: 35,441
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Has anyone checked the wheel bearing end play and ABS sensor depth setting.
I wonder if the front ABS sensor wires are crossed.
There should be grease fittings on the S cam shafts. Have they been greased properly ?
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02-17-2020, 04:36 PM
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#7
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Senior Member
Join Date: Nov 2010
Posts: 386
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Is it possible for me to check ABS Sensor depth? I do know the RF sensor came out during a blow out. I just stuck it back in to make light go out..!
Quote:
Originally Posted by twinboat
Has anyone checked the wheel bearing end play and ABS sensor depth setting.
I wonder if the front ABS sensor wires are crossed.
There should be grease fittings on the S cam shafts. Have they been greased properly ?
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__________________
02 Allegro Bus. Freightliner
ISC 350 Cummins
2019 Chev Colorado
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02-17-2020, 05:00 PM
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#8
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Senior Member
Join Date: Jul 2014
Posts: 35,441
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Quote:
Originally Posted by gerdutch
Is it possible for me to check ABS Sensor depth? I do know the RF sensor came out during a blow out. I just stuck it back in to make light go out..!
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You need to find the specs of the gap and push it in until contact and back it out or measure the gap with a gauge.
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02-18-2020, 04:50 AM
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#9
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Senior Member
Join Date: Nov 2010
Posts: 386
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Thank you both for your input.
__________________
02 Allegro Bus. Freightliner
ISC 350 Cummins
2019 Chev Colorado
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02-18-2020, 08:03 AM
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#10
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Senior Member
Newmar Owners Club
Join Date: Dec 2011
Posts: 724
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There is a roller on the end of the brake shoe that should rotate when activated by the s cam but over time they don’t rotate as easily and take more s cam movement to move the shoes outward toward the brake drum, causing a delay in brake application.
__________________
2002 KSDP 3669/Freightliner XC CHASSIS/Cummins 5.9 ISB 300hp
Joplin, MO
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02-18-2020, 08:20 AM
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#11
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Senior Member
Monaco Owners Club
Join Date: Jun 2014
Posts: 14,601
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If it was the ABS sensor the ABS light would probably stay on all the time.
Do you have a way to check fault codes, if so you should be able to get a code on the ABS fault. I had one on my 2002 Windsor and it showed the front ABS sensor gap problem. Pull the sensor, cleaned and reinstalled. Didn't check gap, just drove it and it corrected.
If the brake is not working the ABS may be coming on because it is sensing a difference in wheel speed and trying to correct.
Sounds like you may have a brake problem, as others suggested it may be the S-cam. Have you been lubricatng, mine has a grease fitting.
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Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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