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Freebirdbeachbum
Samba Member
Joined: July 13, 2018
Posts: 129
Location: Space City
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 Posted: Mon Feb 11, 2019 8:51 am Post subject: Sticky Wheel After Brake Rebuild |
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I did a complete rebuild on the drum brakes (i.e. new master cylinder, new wheel cylinders, new shoes, turned drums) and repacked the bearings.
Three of the four wheels spin freely but the left front is dragging badly and I've not yet even bled the system (yes, I have fully backed-off the adjuster star wheels).
Any thoughts?
Thanks,
Ken
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1971 Super Beetle Convertible
1986 Alfa Romeo Spider
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1972 Honda CB750 Four
1980 Honda 500CX Custom
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1965 Moto Guzzi Lodola GT
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bluebus86
Banned
Joined: September 02, 2010
Posts: 11075
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| Posted: Mon Feb 11, 2019 8:58 am Post subject: Re: Sticky Wheel After Brake Rebuild |
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| Freebirdbeachbum wrote: |
I did a complete rebuild on the drum brakes (i.e. new master cylinder, new wheel cylinders, new shoes, turned drums) and repacked the bearings.
Three of the four wheels spin freely but the left front is dragging badly and I've not yet even bled the system (yes, I have fully backed-off the adjuster star wheels).
Any thoughts?
Thanks,
Ken |
remove drum, inspect shoes for propper seating on holders, make sure springs, e brake and associated parts are correctly installed. make sure shoe ends are correct shape.
Also sometimes the shoes are not centered well, but will become centered when brakes are activated.
Bug On!
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FeelthySanchez
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Joined: February 03, 2011
Posts: 1349
Location: Now is that a real poncho, or a Sears poncho?
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| Posted: Mon Feb 11, 2019 9:34 am Post subject: Re: Sticky Wheel After Brake Rebuild |
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No mention of the return spring. Look it over: properly seated/have enough tension?
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vernonc
Samba Member
Joined: April 23, 2012
Posts: 681
Location: Parkersburg, WV..yes, I sold the boat
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| Posted: Mon Feb 11, 2019 9:41 am Post subject: Re: Sticky Wheel After Brake Rebuild |
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Are the adjusters installed properly? They only go in one way because of the 'angle' in the slot.
mort
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Eric&Barb
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Joined: September 19, 2004
Posts: 26440
Location: Olympia Wash Rinse & Repeat
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| Posted: Mon Feb 11, 2019 12:04 pm Post subject: Re: Sticky Wheel After Brake Rebuild |
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Sounds like a bad brake flex line. Flex lines are actually each one line inside the other. What happens is the inner sleeve after so much time (about 8 to 10 years) breaks up and turns the line into a one way valve. Pressure will go to the wheel, then takes a long time to go back to the MC. Causing the shoes to drag against the drum and possibly causing a fire.
If it has been about a decade or who knows when flex lines were last replaced. Then time to do so and save you more headaches out on the road.
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Freebirdbeachbum
Samba Member
Joined: July 13, 2018
Posts: 129
Location: Space City
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| Posted: Tue Feb 12, 2019 6:18 am Post subject: Re: Sticky Wheel After Brake Rebuild |
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| Eric&Barb wrote: |
Sounds like a bad brake flex line. Flex lines are actually each one line inside the other. What happens is the inner sleeve after so much time (about 8 to 10 years) breaks up and turns the line into a one way valve. Pressure will go to the wheel, then takes a long time to go back to the MC. Causing the shoes to drag against the drum and possibly causing a fire.
If it has been about a decade or who knows when flex lines were last replaced. Then time to do so and save you more headaches out on the road. |
Sorry, forgot to also include new flex lines.
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1971 Super Beetle Convertible
1986 Alfa Romeo Spider
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1980 Honda 500CX Custom
1968 Benelli Cobra
1965 Moto Guzzi Lodola GT
1973 Moto Guzzi Eldorado |
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Freebirdbeachbum
Samba Member
Joined: July 13, 2018
Posts: 129
Location: Space City
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| Posted: Tue Feb 12, 2019 6:39 am Post subject: Re: Sticky Wheel After Brake Rebuild |
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I ruled out the drum and the bearings as problematic by swapping with the right side. It seems the drum gets hung up pressing it on the last 1/4" or so.
Can anyone spot a problem here:
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1971 Super Beetle Convertible
1986 Alfa Romeo Spider
2017 Triumph Tiger Explorer
1972 Honda CB750 Four
1980 Honda 500CX Custom
1968 Benelli Cobra
1965 Moto Guzzi Lodola GT
1973 Moto Guzzi Eldorado |
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vernonc
Samba Member
Joined: April 23, 2012
Posts: 681
Location: Parkersburg, WV..yes, I sold the boat
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| Posted: Tue Feb 12, 2019 6:56 am Post subject: Re: Sticky Wheel After Brake Rebuild |
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This is a 'wild ass guess' but could the backing plate be slightly bent? This could cause the back of the shoes to have a slightly larger diameter than the front.
mort
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"Those who don't read newspapers are un-informed. Those who do read newspapers are mis-informed." Will Rogers
'69 sedan, low mileage, all original.....currently being 'freshened-up' for road trips and daily driving...just not every day
Freshening-up link http://www.thesamba.com/vw/forum/viewtopic.php?t=617386 |
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Q-Dog
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Joined: April 05, 2010
Posts: 8881
Location: Sunset, Louisiana
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| Posted: Tue Feb 12, 2019 7:08 am Post subject: Re: Sticky Wheel After Brake Rebuild |
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One of the adjusters is installed upside down. Slot angle needs to match shoe angle. Check the wheel cylinder slots to make sure one of them isn't upside down too.
(rear wheel, but same deal)
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Cusser
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Posts: 33587
Location: Hot Arizona
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| Posted: Tue Feb 12, 2019 7:18 am Post subject: Re: Sticky Wheel After Brake Rebuild |
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| Freebirdbeachbum wrote: |
I ruled out the drum and the bearings as problematic by swapping with the right side. It seems the drum gets hung up pressing it on the last 1/4" or so.
Can anyone spot a problem here:
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Bottom right adjuster slot needs to be rotated 1/2 turn so slot lines up.
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bluebus86
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Posts: 11075
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74 Thing
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Joined: September 02, 2004
Posts: 7692
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| Posted: Tue Feb 12, 2019 9:35 am Post subject: Re: Sticky Wheel After Brake Rebuild |
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It is the adjuster screw on the right bottom of the photo as indicated above. Remove that shoe, then rotate the screw 180 degrees, then reinstall.
If you look at the adjuster screws they are angled and the shoe should sit flat in the screw face-if not you have it installed backwards! |
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ashman40
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Joined: February 16, 2007
Posts: 16802
Location: North Florida, USA
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| Posted: Tue Feb 12, 2019 12:08 pm Post subject: Re: Sticky Wheel After Brake Rebuild |
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Here's some pics that help illustrate what the others are talking about:
In the upper pic you can see that on the late model adjuster screw the slot is cut all the way to the threads on one side. This is the top of the adjuster screw.
You can see this in the bottom pic on the right side as the screw is virtually cut away so you can see the bottom of the shoe rests on the slant inside the slot. Compared to your pic where the shoe is being held further away by the inverted screw slot.
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Freebirdbeachbum
Samba Member
Joined: July 13, 2018
Posts: 129
Location: Space City
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| Posted: Tue Feb 12, 2019 11:07 pm Post subject: Re: Sticky Wheel After Brake Rebuild |
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Y’all are pretty good. Both adjusters were upside down. Thanks so much.
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1971 Super Beetle Convertible
1986 Alfa Romeo Spider
2017 Triumph Tiger Explorer
1972 Honda CB750 Four
1980 Honda 500CX Custom
1968 Benelli Cobra
1965 Moto Guzzi Lodola GT
1973 Moto Guzzi Eldorado |
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