GM Longroof Forum
Would you like to react to this message? Create an account in a few clicks or log in to continue.



 
HomeHome  PortalPortal  GalleryGallery  Latest imagesLatest images  SearchSearch  RegisterRegister  Log in  

 

 Sticking drum brake

Go down 
4 posters
AuthorMessage
Walterf




Posts : 155
Join date : 2019-03-23
Location : Daytona area, Florida

Sticking drum brake Empty
PostSubject: Sticking drum brake   Sticking drum brake Icon_minitimeSat Feb 25, 2023 2:36 pm

91 OCC. Adjusted rear drum brakes to just dragging but right one got bound up. Replaced leaky axle seal and changed shoes and installed new drums. Left is fine but right drags slightly and drum gets real hot. Not the adjustment and installation seems right. Could it be wheel cylinder? Replaced with China after market about 3 years ago, not leaking.
Back to top Go down
Fix Until Broke




Posts : 251
Join date : 2019-04-05
Location : Southeast Wisconsin

Sticking drum brake Empty
PostSubject: Re: Sticking drum brake   Sticking drum brake Icon_minitimeSat Feb 25, 2023 4:41 pm

Check/double check that all the hardware is installed correctly.

Very unlikely that it's a wheel cylinder.

Is your brake fluid fresh in the whole system
Back to top Go down
Walterf




Posts : 155
Join date : 2019-03-23
Location : Daytona area, Florida

Sticking drum brake Empty
PostSubject: Re: Sticking drum brake   Sticking drum brake Icon_minitimeSat Feb 25, 2023 5:34 pm

This one has the self adjuster on the primary shoe per The FSM includes the following note, "Some cars pqarking brake installed on primary shoe". However, the cable would nto permit that. I'm tempted to scrap the self adjuster and just use a brake spoon from time to time. THX


Back to top Go down
goldwolfnhn




Posts : 328
Join date : 2019-07-11
Location : Stevens Point, Wisconsin

Sticking drum brake Empty
PostSubject: Re: Sticking drum brake   Sticking drum brake Icon_minitimeSat Feb 25, 2023 6:26 pm

stupid question, but did you clean up the backing plate, primarily the contact patches that the shoes ride on?
Back to top Go down
Walterf




Posts : 155
Join date : 2019-03-23
Location : Daytona area, Florida

Sticking drum brake Empty
PostSubject: Re: Sticking drum brake   Sticking drum brake Icon_minitimeSat Feb 25, 2023 8:17 pm

not a stupid question at all. I cleaned them but did not grease them. The hold down spring on the rear (primary) shoe is really tight over the self adjuster lever. Even when dragging, the drum comes off relatively easy.
Back to top Go down
booster




Posts : 582
Join date : 2020-04-21
Location : Andover, Minnesota

Sticking drum brake Empty
PostSubject: Re: Sticking drum brake   Sticking drum brake Icon_minitimeSat Feb 25, 2023 9:22 pm

The sticking on the parking brake cross piece is a pretty deal, I think, and the cause of many dragging rear shoes. People tend to like them snug because they are afraid of rattles, but they need to be able to move freely because you don't really know how they are going to move when activated. The should also be greased with moly grease like the shoes to backing plate. My cross piece on the parking brake were petty worn so I got new and of course they were the wrong ones and I had to open up the slots.
Back to top Go down
Walterf




Posts : 155
Join date : 2019-03-23
Location : Daytona area, Florida

Sticking drum brake Empty
PostSubject: Re: Sticking drum brake   Sticking drum brake Icon_minitimeMon Feb 27, 2023 3:13 pm

I filed the parking brake cross bar, greased the contact points and emptied and bled wheel cylinder. Starts out fine but begins to drag after several stops. Leads me to believe the wheel cylinder is hanging up. Will let forum know result when parts arrive and are installed.
Back to top Go down
Walterf




Posts : 155
Join date : 2019-03-23
Location : Daytona area, Florida

Sticking drum brake Empty
PostSubject: Re: Sticking drum brake   Sticking drum brake Icon_minitimeTue Feb 28, 2023 12:07 pm

Changing wheel cylinder helped. After market part needed filing to fit correctly but works well. Still finding that right drum running a bit hotter than left. I guess I need to live with it. Thanks for advice.

Back to top Go down
Walterf




Posts : 155
Join date : 2019-03-23
Location : Daytona area, Florida

Sticking drum brake Empty
PostSubject: Re: Sticking drum brake   Sticking drum brake Icon_minitimeFri Mar 03, 2023 1:00 pm

The problem turned out to be with the after market drum being out of round. An old time mechanic called it "cast shift" and said it can't be machined out. Waiting on replacement drum from Autozone but car operable in the meantime.

I suppose us Longroofers are now caught up in the problem with poorly manufactured, imported aftermarket replacement parts being all that's available. Case in point are the fuel pumps.
Back to top Go down
goldwolfnhn




Posts : 328
Join date : 2019-07-11
Location : Stevens Point, Wisconsin

Sticking drum brake Empty
PostSubject: Re: Sticking drum brake   Sticking drum brake Icon_minitimeFri Mar 03, 2023 2:02 pm

well it's not just for our b body cars, I was going from De Pere to Stevens point with my old suburban that had a plow, just outside of Waupaca the rear drivers side tire came off. a local shop replaced the brakes on that corner and a started noticing a noise, took it to a local shop once I got back home and they found that while the drum was fine the holes, for the lugs and the axle, where off centered so it couldn't even be put on a lath to try and get it true and the only option was replacement or put up with the noise.
Back to top Go down
Sponsored content





Sticking drum brake Empty
PostSubject: Re: Sticking drum brake   Sticking drum brake Icon_minitime

Back to top Go down
 
Sticking drum brake
Back to top 
Page 1 of 1
 Similar topics
-
» drum brake adjustment...
» Spongy brake pedal and brake light.
» Where did my brake fluid go?
» Some brake questions
» Tailgate Glass Release button sticking

Permissions in this forum:You cannot reply to topics in this forum
GM Longroof Forum :: Longroof Tech :: Suspension, Steering and Brakes-
Jump to: