failed emissions... because I "don't have back brakes"
08-21-2012, 04:42 PM
#1
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Year: 1993
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failed emissions... because I "don't have back brakes"
Any thoughts on this one? I failed emissions today because they put it on the dyno and couldn't get the back brakes to stop the rear wheels. I have never worked with drum brakes in my life before and was wondering if I simply have to tighten something or if there's a bigger problem. I already did a visual inspection of my brake lines from the master cylinder all the way back and couldn't find anything wrong with them.
08-21-2012, 04:47 PM
#2
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Engine: Check
Pull the rear tire. The drum's hat SHOULD slide off.
If it does, inspect the shoes, wheel cylinders, and adjuster. Replace as needed.
If not...then its prolly time to do some rear brake maintenance.
If it does, inspect the shoes, wheel cylinders, and adjuster. Replace as needed.
If not...then its prolly time to do some rear brake maintenance.
08-21-2012, 04:52 PM
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Year: 1995
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Engine: 4.0 HO
Any thoughts on this one? I failed emissions today because they put it on the dyno and couldn't get the back brakes to stop the rear wheels. I have never worked with drum brakes in my life before and was wondering if I simply have to tighten something or if there's a bigger problem. I already did a visual inspection of my brake lines from the master cylinder all the way back and couldn't find anything wrong with them.
If there is some brake left on the shoes then your self adjuster isnt working. that is at the bottom and is supposed to self adjust. If the adjuster can not spin then it will not self adjust. I would still suggest just putting new shoes on once you have the tires off and drums off. There are write ups out there to help you replace the drum brakes with pictures.
https://www.cherokeeforum.com/f51/ho...kes-d35-45100/
08-21-2012, 06:01 PM
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Thank you to you both! I have done countless brake jobs, but I've always been scared of drum brakes because I've never had to dig into them before. I'll check into everything and I'll follow that write up and see if I can figure it out.
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08-21-2012, 08:53 PM
#9
Caracticus Potts The Mod
When doing emission testing on a dyno, you need to be able to brake when your finished. Also some states do a loaded emission test by dragging the brake a little while accelerating the vehicle to simulate actual driving conditions.
08-21-2012, 09:01 PM
#10
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Originally Posted by Willys55
When doing emission testing on a dyno, you need to be able to brake when your finished. Also some states do a loaded emission test by dragging the brake a little while accelerating the vehicle to simulate actual driving conditions.
08-21-2012, 11:48 PM
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We have dyno emissions and they told me it was unsafe doing a rwd dyno without rear brakes. I told them I could put it in 4wd, and we could put it on an awd dyno and use the front brakes to stop the rear wheels and they said they had already associated my VIN with needing a safety inspection prior to testing so they can't do that. I'm guessing they will find something else if they do a safety inspection...
08-22-2012, 06:24 AM
#12
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We have dyno emissions and they told me it was unsafe doing a rwd dyno without rear brakes. I told them I could put it in 4wd, and we could put it on an awd dyno and use the front brakes to stop the rear wheels and they said they had already associated my VIN with needing a safety inspection prior to testing so they can't do that. I'm guessing they will find something else if they do a safety inspection...
08-22-2012, 07:06 AM
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Year: 1996
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Originally Posted by cruiser54
Inspect and adjust if possible. The "self adjusting" brakes on our Jeeps don't.