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Old 05-07-2018, 01:18 PM   #1
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parking brake does not activate

2001 sunsport cummings with Allison tranny.Went to park on slight incline and had no park brakes,had to block it with 4x4.Brake release switch sounds like it is working but it will roll down the incline.Just finished 200 mile drive and brakes work and holds full pressue.Any ideas on what to check? thanks
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Old 05-07-2018, 01:48 PM   #2
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With the wheels chocked, I'd get eyes on the parking brake mechanism as someone applies and releases the parking brake. It could be a frozen mechanism or just brake shoes that need adjustment.
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Old 05-07-2018, 01:55 PM   #3
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Sounds like your parking brake is on the driveshaft, not dual chamber spring parking brakes on the rear brake drums. Let us know which you have.
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Old 05-07-2018, 01:57 PM   #4
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Quote:
Originally Posted by greezykid View Post
2001 sunsport cummings with Allison tranny.Went to park on slight incline and had no park brakes,had to block it with 4x4.Brake release switch sounds like it is working but it will roll down the incline.Just finished 200 mile drive and brakes work and holds full pressue.Any ideas on what to check? thanks
What chassis do you have and does it have air brakes?
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Old 05-07-2018, 02:12 PM   #5
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2001 gulfsteam sunsport diesel with air over hydraulic brakes on spartan frame.
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Old 05-07-2018, 02:21 PM   #6
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The drive shaft mounted parking brake needs an adjustment.

Watch as someone actavates it. The rod going into the spring chamber should only move 1 to 2 inches. Don't know if you adjust the rod or it has a star wheel inside that you get to thru a oval shaped slot. The slot may have a rubber plug in it.

If it has an adjustment slot, with the brake off, turn the star wheel until tight and then back off 5 or 6 teeth. Then apply it and check the rod movement.
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Old 05-07-2018, 04:03 PM   #7
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X2 on the ^^^^ and it's about the same as adjusting the brakes on a trailer. Block the wheels, but you knew that.
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Old 05-08-2018, 04:44 PM   #8
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I have a air cylinder mounted next to enclosed housing which I'm sure is driveshaft brake. looks like only adjustment is on air cylinder threaded yoke.I'll let you know after I adjust yoke.
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Old 05-08-2018, 05:07 PM   #9
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If adjusting the length of the rod on the air chamber doesn't give braking action, you might have to disassemble the enclosed housing and replace the brake shoes. (or pad if it's a disc brake)
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Old 05-09-2018, 06:51 AM   #10
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If adjusting the length of the rod on the air chamber doesn't give braking action, you might have to disassemble the enclosed housing and replace the brake shoes. (or pad if it's a disc brake)
Does your unit have this set up for adjusting?
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Old 05-09-2018, 09:34 AM   #11
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Does your unit have this set up for adjusting?
Yes, a slight tightening of the rod made my parking brake hold on a slope when it had slipped before.
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Old 05-09-2018, 10:43 AM   #12
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Yes, a slight tightening of the rod made my parking brake hold on a slope when it had slipped before.
Thanks,spartan was no help!
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Old 05-09-2018, 10:47 AM   #13
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Yes, a slight tightening of the rod made my parking brake hold on a slope when it had slipped before.
Oops, rereading my post I meant to say "lengthening of the rod" not tightening.
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Old 05-15-2018, 11:06 AM   #14
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!st answer was right,tighten.
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