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Old 07-15-2006, 08:48 PM   #1
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1996 34' Excella
Americus , Georgia
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Rear disk brake adjustment on Yukon ?

Hi Ya`ll,
I would like to know if the rear disk brakes can be adjusted on a 2001 GMC Yukon ? If so how ? I would also like to know if the parking brake can be adjusted because there is no braking when parking brake pedal is depressed . Thanks Davis.
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Old 07-15-2006, 11:46 PM   #2
Frank S
 
1973 27' Overlander
peoria , Illinois
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Hi Davis--I too lost the parking brake on my 2001 Suburban, probably by driving a short distance with it on. It is not forgiving like a drum brake and there is no adjustment. As I understand it the parking brake is separate and is just a small pad that locks against the rotor. Chevy service manager told me they no longer refer to it as an emergency brake, as it will not stop the vehicle in an emergency. His recommendation was to not use it, and just leave the transmission in park. Told him I felt I really needed it for safety when parking hitched to my A/S on an incline. Cost about $230 to have it repaired. I am not aware of any adjustment for disk brakes, as they are basicly self adjusting.--Frank S
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Old 07-16-2006, 04:20 PM   #3
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1960 24' Tradewind
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OK everyone , here is the story on the park brake deal .I have repaired these alot in my repair shop .The rear disc rotor has the park brake shoe inside the
HAT as it is called ,the part the studs protrude from .Pull the rear calipar and retaining bracket off .Then remove the rotor ,you mught be (usually) shocked
to find the park brake shoe is metal on metal with the rotor destoying the inside. The dealer has the replacement shoes and a newer style retainer clip
and screws to help the shoe stay centered .What happens is that you apply
the park brake as normal then release to drive ,the park brake shoes stays leaned over on the rotor ,no pressure on it but it just lays against it and the shoe wears down. the new clip seems to help keep the shoe from moving off center ,the whole shoe (shaped like a horse shoe) floats at the top so it can
move off center .Gm has claimed that a loose park brake pedal is normal and
its a load of BS .When operating properly ,as you apply the pedal on the park
brake it will go down without the NORMAL feel most vehicals have ,but will feel like it is getting tight ,not as tight as the older styles however.So the
first thing to do is pull the rear rotors for inspection .The little clips over the
wheel studs ,you may find 2 or 3 can be cut off and tossed as they hold the rotor in place during the assembly at the factory .If your dealer said they checked it ,and you check it and find the clips still there ,as I have with some of my customers yukons etc, you know they never looked .If the damaged is there you do need to replace the rotors and You don't need to get them from GM. GM is not admitting a problem with this design but it is a common failure.
and the redesign clip GM sells with the new shoe you will get from the dealer
tells the story .After repairs ,removal of the rotor is necessary for routine
inspection .All the GM trucks with rear disc including suburbans and pickups
all use this setup .

Scott
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Old 07-16-2006, 04:24 PM   #4
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One more thing ,the dealers says don't use it because they fail as posted .
and they say park brake because ,no way it will save you in an emergency,last ,they want no liabiliy anyway ,and the factory designed it and the dealer cannot really solve it permanently anyway.

Scott
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Old 07-16-2006, 06:54 PM   #5
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Thanks for the replies. Guess I need to remove the rotors for inspection. Thanks Davis.
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Old 07-16-2006, 09:31 PM   #6
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Quote:
Originally Posted by scottanlily
One more thing ,the dealers says don't use it because they fail as posted .
and they say park brake because ,no way it will save you in an emergency,last ,they want no liabiliy anyway ,and the factory designed it and the dealer cannot really solve it permanently anyway.

Scott
I'd say they fail in many cases because they are light duty and due to people forgetting to release the parking brake before driving. Mine works perfectly ('01 2500hd w/ 55,000 miles) but I remember to release it before driving. My boss at work is another story. He was driving down the highway with a few coworkers and they started smelling something. He had driven more than 5 miles on the highway with the parking brake on (Chrysler van). Did he ever take a ribbing.
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Old 07-16-2006, 10:29 PM   #7
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1960 24' Tradewind
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Hello craig ,

sorry to disagree but ,definatley not the reason .The brake release dash light is very obviouse and right in front of you and this problem is very common.
My posting clearly states the exact cause .2 of the first trucks ,a suburban
and a 1500 pickup that I repaired were almost new with low miles ,this happens very quickly .Ive done at least 10 of these trucks in the last year
alone ,all the same problem ,why do you think the dealer says don't use it.
how dumb is that to tell a customer not to use the parking brake anyway?
Now, you mentioned you have a 2500 hd so that changes the story as it is
the 1/2 ton 1500 series trucks 6 lug wheels that have the trouble ,thats not to say others don't leave the brake on sometimes but ,definately the design.
remember i said GM redesigned the top retainer clip to try to keep the shoe
in the center of the spinning rotor.It has had some improvement ,no real
solution to the problem and there are many of these trucks needing repaired.
I will see more of them as well to repair .If I pull the rotors to check the shoe
only one side of the shoe (the side that has been rubbing leaning over onto
the rotor)will be ground down .even if the lining on the shoe was thicker
you still need to keep the shoe centered .If you get the chance to see
one of these setups being repaired you will see what I mean .There is no
maybe on this problem as to the cause .Gm stocks these park brake shoe
kits in large quantities ,and I have spoke to the local dealership owner here
in town when a customer was charge 80 dollars for a check on his 1500 truck
and the rotor clips were never removed ,I pulled the rotors with the customer right there to see ,and the rotors were all tore up ,you can bet the dealer
service department got an earful .

Scott
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Old 07-17-2006, 10:24 PM   #8
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Scott,
If you get a chance, post a picture of the setup if you run across it again. Manufacturers do some strange development sometimes all for the sake of simplicity or just to make a cheaper part i.e. tailgate cables in place of the steel straps.
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Old 07-17-2006, 10:30 PM   #9
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I most definately will do that ,seeing is believing for sure.

Scott
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