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Old 04-27-2007, 05:10 AM   #1
magnumtow
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topkick parking brake

My parking brake on my 1996 gmc topkick keeps going on by it self and beeping starts so i have to stop the truck and reset the brake then it does it again i have an allison automatic transmission anyone have any idea of what might be going on here please let me know thanks
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Old 04-27-2007, 01:05 PM   #2
axle
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do you have an air leak ? if so is it when you apply your brake or all the time could be a brake chamber or a hole in a hose etc.
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Old 04-27-2007, 01:57 PM   #3
John_G
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No it sounds like he has the hydraulic parking brake set-up. Eeeewwwwww!

These electrical over hydraulic parking brake things are TERRIBLE.

There is a "black box" that controls the whole thing at the driver's left foot area. On the box there is a 2 digit display and a hole with two small terminals inside. To read out the codes you short the terminals togather (I use a screwdriver). If you can get the codes, I may have the book handy.

The most common causes of PB problems are a bad ground at the frame from the battery cables near the battery box on the RH side under the cab, a bad or failing isolation solenoid (under the cab on the driver's side above and infront of the parking canister in the service box), then contamination of the fluid in the reservoir.

There are TONS more things that goes wrong with these POS parking brake systems, but those three are the most common.
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Old 04-27-2007, 02:18 PM   #4
magnumtow
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if u can can u send me the trouble codes for the unit so i can see what code i got fax me at 505-438-8697 or call me at 505-424 0346
thanks
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Old 08-24-2009, 02:54 AM   #5
Joe Greasegun
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Quote:
Originally Posted by John_G View Post
No it sounds like he has the hydraulic parking brake set-up.
A rebuild kit for the hydraulic actuator is unavailable from GMC.
I have them....
Email me for details....
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Old 08-15-2010, 01:38 PM   #6
corrick
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gmc topkick park brake

i to have a problem finding code look up for the park brake i have error code 03 if some 1 can tell me what it is that would be great trying to get this truck on the road this week
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Old 06-04-2012, 03:38 PM   #7
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Quote:
Originally Posted by Joe Greasegun View Post
A rebuild kit for the hydraulic actuator is unavailable from GMC.
I have them....
Email me for details....
I have a 2001 GMC Topkick C6500 with a spitting actuator and found that Uhaul truck parts online has this kit.

Uhaul truck parts online has it listed on Ebay also.
They list it as: GMC C6000 Topkick Actuator Seal Kit 1993 - 1994.
It seems to be the same for most years of this style actuator.

GM Part # of the complete actuator is 15967298.

I just ordered the part from Uhaul. At this time the kit costs under 30.00 with shipping.

The cost of a new complete actuator from GM at this point in time is $968.00.

I hope this works to cure my problem.

I'll let you know if this works for me so that in the future , it may work for you.
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Old 06-17-2012, 12:53 AM   #8
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UPDATE: I got the kit from Uhaul and installed the seal. It wasn't very hard to do and I only had to take off the 4 bolts and the line to get to the seal(s). I took less that 1 hour and now the Emergency brake works again like it is supposed to. The only thing that I am trying to figure out is how to reset the "service park brake light". Any thoughts?
Thank my stars for this may have cost me upwards of $1,700.00 or more to get repaired/towed/parts.
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