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Old 11-10-2002, 09:29 AM   #1
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emergency brakes

My 79 has rear drum brakes.
I just adjusted the emergency brakes and now have a strong emergency brake going forward. Going backwards I have virtually no emergency brake. It will pretty much role out of the driveway. I only saw one adjusting wheel. What gives?
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Old 11-10-2002, 09:39 AM   #2
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Rear axle brakes or the trans/driveshaft mounted brake?

John
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Old 11-10-2002, 09:42 AM   #3
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drum emergency brake. I think only the rear disk brake rigs have the driveshaft brakes?
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Old 11-10-2002, 10:17 AM   #4
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Don't know if you have a manual, this is a synopsis for the pedal type:

Raise on hoist

Apply parking brake 1 notch from fully released.

Tighten equalizer nut until a moderate drag is felt when rotated forward.

Fully release brake and rotate rear wheels. No drag should be felt.

Shoes are leading and trailing (primary and secondary, I have heard both). The leading shoe helps drive both shoes into the drum. If it works forward, I would look at the rear shoe to see of it is glazed, loose on the pin, springs shot so it could move. Sounds to me like the hardware, the leading shoe is grabbing going forward but the whole assembly is not expanding enough to lock against the drum.
John
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Old 11-10-2002, 10:50 AM   #5
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Thanx John,
I got it. I first adjusted the rear brakes even more. It's a myth that the rear drum brakes will always adjust automatically. The last thing you want to do is backing up a lot.
The further adjustment gave me a little more emergency brake going in reverse.
Then I took some of the stretch out of the cable, as you mentioned above.
I think there is a mechanical difference in emergency brake strenght going forward or reverse.
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Old 11-10-2002, 10:59 AM   #6
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I think there is a mechanical difference in emergency brake strenght going forward or reverse.

Got to be, the leading shoe has more bite. The way the hardware forces it to expand going forward probably isn't a lot of help in reverse either.

John
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Old 08-04-2012, 08:39 PM   #7
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I revived this old thread from 2002 to hopefully get some input on my 1987 345 emergency brakes adjustment. Since I have rear disk brakes, do we have driveshaft emergency brakes and how do they get adjusted?
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Old 08-05-2012, 03:36 PM   #8
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Attaching the pages from the "Chevrolet Motor Home Chassis Service Manual" on adjusting the driveline parking brake.
Attached Files
File Type: pdf parking brake adjustment.pdf (820.2 KB, 53 views)
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Old 08-06-2012, 07:02 AM   #9
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Thank you kindly!
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