70 C10 rear brake ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

lutronjim · 07-20-2018, 10:18 PM

Brakes hung partially - popped petal and they released. Since I have disk in front I expected rear. Pulled hubs today to see what I needed.

Passenger side looked to have a good 20% of lining left. Driver side was so thin that lining was crackled on both primary and secondary shoes.

Why would hydraulic brakes wear with so much difference? The pressure should be equal. Passenger drum had almost no wear - driver drum had such a low amount that I am not going to have them turned.

**mongocanfly** · 07-21-2018, 12:53 AM

might have been the way the were adjusted......one tighter than the other and dragging

AcampoDave · 07-21-2018, 10:26 AM

I'd guess the worn out side was working fine, the other had a problem with the self adjuster which kept it from fully functioning. Maybe just corrosion. It happened to me when I had a Waverunner due to backing my rear wheels into the water when I launched it.

lutronjim · 07-21-2018, 10:42 PM

AcampoDave that kinda makes sense. The adjuster, however, looked OK at first glance. See pics.

AcampoDave · 07-22-2018, 05:39 PM

Is that brake fluid all over it and was it like that when you popped the drum? Also adjusters come in drivers and passengers side. They thread in opposite directions. After all these years, who knows they could be both the same. Edit: having drums turned always improves braking when you remove the "mirror finish" As a bonus your e-brake will stop you better in an emergency. These are the rear brakes.... do it once first class and it'll last a long time. Way longer than fronts do.

68gmsee · 07-22-2018, 07:34 PM

After fighting break problems on my 68 for many years I finally decided to go all out and replace all new parts. I got all new break cylinders, shoes, springs and clips and had the drums turned. I took apart the adjusters and cleaned them with wire brush and coated them with a thin coat of grease.

I also replaced all the rubber hoses -two in front and the one for the rear brakes (I had one collapse on my 69 many years ago and caused the rear brakes to hang). It's amazing the difference it made in braking

lutronjim · 07-22-2018, 11:25 PM

Wet stuff was mineral spurts that I was using to clear off dust. Since there was only 'bout 20% left, I assumed the adjuster is correct but I'll double check when I do that side.

I had switched fronts to disk.

**Captainfab** · 07-22-2018, 11:28 PM

You might want to double check that the adjusters are on the correct side, or are correct for the side they are on.

AcampoDave · 07-23-2018, 08:06 PM

Quote:

Originally Posted by 68gmsee

After fighting break problems on my 68 for many years I finally decided to go all out and replace all new parts. I got all new break cylinders, shoes, springs and clips and had the drums turned. I took apart the adjusters and cleaned them with wire brush and coated them with a thin coat of grease.

I also replaced all the rubber hoses -two in front and the one for the rear brakes (I had one collapse on my 69 many years ago and caused the rear brakes to hang). It's amazing the difference it made in braking

Yep,, night and day. I redid all that stuff too and even my longbed with drums all around will do a nice straight hard stop, with no sudden grabs or pulls, or it can lay down a 4 wheel skid when you slam 'em hard.

AcampoDave · 07-23-2018, 08:12 PM

Quote:

Originally Posted by 68gmsee

After fighting break problems on my 68 for many years I finally decided to go all out and replace all new parts. I got all new break cylinders, shoes, springs and clips and had the drums turned. I took apart the adjusters and cleaned them with wire brush and coated them with a thin coat of grease.

I also replaced all the rubber hoses -two in front and the one for the rear brakes (I had one collapse on my 69 many years ago and caused the rear brakes to hang). It's amazing the difference it made in braking

yeah, night and day. I redid all that stuff too and even my longbed with drums all around can lay down a 4 wheel skid.

lutronjim · 07-23-2018, 11:07 PM

Had time to rebuild passenger side today. I found nothing wrong. I was expecting seized or hard to turn adjuster but it rotated freely. It was correct one - marked for right side.

Go figure. I can't remember how long it was since I last relined so if it has the same trouble - I won't complain.

**Wrenchbender Ret** · 07-24-2018, 03:21 PM

Check the emergency brake cables. The side with the thin linings is probably hanging up.

07-20-2018, 10:18 PM	#1
lutronjim Registered User Join Date: Dec 2013 Location: Dunwoody,Ga Posts: 443	70 C10 rear brake ? Brakes hung partially - popped petal and they released. Since I have disk in front I expected rear. Pulled hubs today to see what I needed. Passenger side looked to have a good 20% of lining left. Driver side was so thin that lining was crackled on both primary and secondary shoes. Why would hydraulic brakes wear with so much difference? The pressure should be equal. Passenger drum had almost no wear - driver drum had such a low amount that I am not going to have them turned.

07-21-2018, 12:53 AM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,585	Re: 70 C10 rear brake ? might have been the way the were adjusted......one tighter than the other and dragging __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

07-21-2018, 10:26 AM	#3
AcampoDave Registered User Join Date: Feb 2013 Location: central California Posts: 2,726	Re: 70 C10 rear brake ? I'd guess the worn out side was working fine, the other had a problem with the self adjuster which kept it from fully functioning. Maybe just corrosion. It happened to me when I had a Waverunner due to backing my rear wheels into the water when I launched it. Last edited by AcampoDave; 07-21-2018 at 10:32 AM.

07-21-2018, 10:42 PM	#4
lutronjim Registered User Join Date: Dec 2013 Location: Dunwoody,Ga Posts: 443	Re: 70 C10 rear brake ? AcampoDave that kinda makes sense. The adjuster, however, looked OK at first glance. See pics. Attached Images

07-22-2018, 05:39 PM	#5
AcampoDave Registered User Join Date: Feb 2013 Location: central California Posts: 2,726	Re: 70 C10 rear brake ? Is that brake fluid all over it and was it like that when you popped the drum? Also adjusters come in drivers and passengers side. They thread in opposite directions. After all these years, who knows they could be both the same. Edit: having drums turned always improves braking when you remove the "mirror finish" As a bonus your e-brake will stop you better in an emergency. These are the rear brakes.... do it once first class and it'll last a long time. Way longer than fronts do. Last edited by AcampoDave; 07-22-2018 at 05:49 PM.

07-22-2018, 07:34 PM	#6
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: 70 C10 rear brake ? After fighting break problems on my 68 for many years I finally decided to go all out and replace all new parts. I got all new break cylinders, shoes, springs and clips and had the drums turned. I took apart the adjusters and cleaned them with wire brush and coated them with a thin coat of grease. I also replaced all the rubber hoses -two in front and the one for the rear brakes (I had one collapse on my 69 many years ago and caused the rear brakes to hang). It's amazing the difference it made in braking __________________ 68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...

07-22-2018, 11:25 PM	#7
lutronjim Registered User Join Date: Dec 2013 Location: Dunwoody,Ga Posts: 443	Re: 70 C10 rear brake ? Wet stuff was mineral spurts that I was using to clear off dust. Since there was only 'bout 20% left, I assumed the adjuster is correct but I'll double check when I do that side. I had switched fronts to disk.

07-22-2018, 11:28 PM	#8
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	Re: 70 C10 rear brake ? You might want to double check that the adjusters are on the correct side, or are correct for the side they are on. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

07-23-2018, 11:07 PM	#11
lutronjim Registered User Join Date: Dec 2013 Location: Dunwoody,Ga Posts: 443	Re: 70 C10 rear brake ? Had time to rebuild passenger side today. I found nothing wrong. I was expecting seized or hard to turn adjuster but it rotated freely. It was correct one - marked for right side. Go figure. I can't remember how long it was since I last relined so if it has the same trouble - I won't complain.

07-24-2018, 03:21 PM	#12
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,190	Re: 70 C10 rear brake ? Check the emergency brake cables. The side with the thin linings is probably hanging up.



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