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Username Post: 1985 C10 front brake hoses?        (Topic#369898)
Mad Professor 
Contributor
Posts: 172

Reg: 12-30-08
10-29-22 03:16 PM - Post#2849224    

I need to replace both front brake hoses on my C10 2WD.

Had some questions seeking advice before I start as it's my daily driver and don't want to get hung up w/o transportation. This will also be an outside escapade.

Question concerns disconnecting the flexible lines where they go through the frame and connect to the steel lines. Not a lot of room on inside of frame rail.

The truck has a 305 V8 with all the stock stuff including the smog pump on the passenger side.

GM manual does not give much details. Is it best to try to disconnect the steel brake lines before loosening the nuts (on the inside of frame rail) that hold the flexible lines in place? The GM manual shows nuts for 2WD, clips 4WD, could there be clips instead? I've dealt with the clips in the past.....

Also I'm hoping a 1985 still has standard size brake hardware? I have standard tubing wrenches but not metric. If anyone knows the sizes of the hardware that would be an asset.

Since I'll have things apart and will need to bleed the system also plan on changing pads and repacking the wheel bearings. That I've done many times on GMs so no questions there.

Any insight is appreciated. Thank you in advance.



62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
85 C10 305, SM465
89 S10 baja package







 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25808
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
10-30-22 02:50 AM - Post#2849247    
    In response to Mad Professor

Do you have the GM manuals? I'll have to look through my manual to see if wrench sizes are available. Standard size should work.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
Mad Professor 
Contributor
Posts: 172

Reg: 12-30-08
10-30-22 07:12 AM - Post#2849261    
    In response to gchemist

I've got the complete truck/van shop manual but 1986, should be about sameas 1985? ~1500 pages

Not jack on details. Shows what looks like 2WD w/nuts? through frame, 4WD lines on a hanger w/clips?

All I have is that GM manual.

Since this is a driveway job, also thinking about where to block up frame? Lower control arm blocking is going to be in the way to get at line connections inside frame rail. Thinking frame under cab. I've got 6 X 6" cutoffs to work with.

Glad I just got a new high lift floor jack......

62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
85 C10 305, SM465
89 S10 baja package







 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25808
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
11-01-22 11:30 AM - Post#2849386    
    In response to Mad Professor

Have you searched other K10 forums? I can post a few links.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
Tony1963 
Frequent Contributor
Posts: 1788

Loc: Orlando Florida
Reg: 07-09-18
11-01-22 01:47 PM - Post#2849395    
    In response to Mad Professor

I believe that you will find the steel brake line with metric fittings.

The trick is to spray down the end of the line with PB Blaster and remove the hold down clip for the line. Then, with a line wrench, try to break loose the line from the steel fitting.



People fear change because it threatens what they know, or what they claim to know.


 
Shepherd 
Valued Contributor
Posts: 2761

Loc: Lake George, NY
Reg: 11-11-15
11-01-22 02:50 PM - Post#2849400    
    In response to Tony1963

Correct on the metric fittings, by 85 GM had switched to metric and mostly bubble flares on the lines, the calipers were definitely metric.



 
Mad Professor 
Contributor
Posts: 172

Reg: 12-30-08
11-03-22 10:18 PM - Post#2849586    
    In response to Tony1963

  • Tony1963 Said:
I believe that you will find the steel brake line with metric fittings.

The trick is to spray down the end of the line with PB Blaster and remove the hold down clip for the line. Then, with a line wrench, try to break loose the line from the steel fitting.





Tony, I'm not sure what you mean by line wrench? Tubing flare/nut wrench or something different?

I have a set of tubing/flare nut wrenches but it looks like I'll be investing in some metric ones.

Thanks to all for the advice. This is a 2WD C10 not a K10

I can't post the image from the manual as I'm not a paying member. It seems to so a nut on the inside of the frame rail securing the line. I guess I'll find out for sure when I crawl underneath it.

One more ? I see they make crowfoot flare wrenches. Would it be worth getting those too to get at the nuts inside the frame rail? Might see if I can get these as loaners as money is tight right now.


62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
85 C10 305, SM465
89 S10 baja package







Edited by Mad Professor on 11-03-22 11:11 PM. Reason for edit: No reason given.

 
Mad Professor 
Contributor
Posts: 172

Reg: 12-30-08
11-04-22 07:18 AM - Post#2849595    
    In response to Mad Professor

I found a youtube link for doing the hoses on a 1977. The steel line nut was 3/8" and the retaining nut 15/16". So I'm guessing metric will be 10mm and 22-24mm? Does have a clip on wheel side. Not sure if my 3/8" might slip on the Nut, that's 9.5 mm.

Looks to be a real PITA to get at the nuts. I might have to get crowfoot flare wrench set.

Update Friday PM. Went to HF and got metric tubing/flare and clawfoot tubing/flare wrench sets. Sprayed down wheel wells and frame around brake lines with engine cleaner. Sprayed some PB blaster on the fittings and got underneath the truck. Turns out the PITA nuts are standard 3/8" and have not got them to move with my tubing wrench. Sprayed with more PB blaster and called it quits this afternoon. Nothing is apart so can still drive the truck and exchange the tools tomorrow. The clawfoot tubing wrench might be the ticket? I think a short 3/8" extension will get me on the nuts, with room to try to turn them.

Driver side is a PITA to get at, PS pump is in the way I might move that, then heat the fitting with some MAPP.

The other side is worse. Smog pump in the way and gas lines running alongside with the brake line so no heating that one. Not sure if I can move the smog pump out of the way easy?

The lines/pipes and fittings seem in good shape so want to save the lines.

c10 brakes hoses

62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
85 C10 305, SM465
89 S10 baja package







Edited by Mad Professor on 11-04-22 12:29 PM. Reason for edit: No reason given.

 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25808
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
11-04-22 03:31 PM - Post#2849626    
    In response to Mad Professor

What's a smog pump? It's the first thing I removed off mine. It's been a while since I checked under the hood. Email me a pic or two. I'll post them for you.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
Mad Professor 
Contributor
Posts: 172

Reg: 12-30-08
11-04-22 04:32 PM - Post#2849627    
    In response to gchemist

I got the truck with 32,000 original miles. The whole engine compartment was stock with all the hoses and crap but everything works properly. Until I start having problems I'm keeping it original. It just turned 40,000. Yup, still has smog pump.

My camaro is just the opposite, bare bones simple. Single wire GM dist with curve kit. PCV and vac advance are only vac lines, hide away grill vac is disconnected. Carter mech pump and holley 4150 carb. Still has power steering. That has a 370/350 I built up years ago.

My 73 C10 w/292 I-6 too 1-wire GM dist, rebuilt man choke carb off a 60s 292. Put in a spare muncie M20-21? I had lying around. That one you can camp out under the hood when it's raining and work on it.

Thanks for the offer on the pictures I'll try to get some as I do the work to help others out.

62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
85 C10 305, SM465
89 S10 baja package







Edited by Mad Professor on 11-04-22 04:34 PM. Reason for edit: No reason given.

 
Mad Professor 
Contributor
Posts: 172

Reg: 12-30-08
11-06-22 05:05 AM - Post#2849699    
    In response to Mad Professor

Loaded for bear now. Got the crowfoot tubing wrenches (SAE). 3/8" 24 tubing nuts/connectors and Ni/copper 3/16 brake line (had that from 25' roll), double flare tool. I can work back to proportioning valve if need be. Still will be a PITA.

Seems all is still standard on my 1985. 3/8" 24 fittings went into brake hoses and the 3/8" tubing wrench on proportioning valve nuts.

62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
85 C10 305, SM465
89 S10 baja package







 
Tony1963 
Frequent Contributor
Posts: 1788

Loc: Orlando Florida
Reg: 07-09-18
11-20-22 12:49 PM - Post#2850286    
    In response to Mad Professor

Mad Professor - my apologies. When I mentioned a "line wrench" I was referring to the wrench that grips the end of the nut on five sides.

Sometimes referred to also as flare nut wrenches.

https://www.amazon.com/Crescent-CFNWS1-Metri c-Flar...

People fear change because it threatens what they know, or what they claim to know.


 
Mad Professor 
Contributor
Posts: 172

Reg: 12-30-08
11-24-22 06:08 AM - Post#2850417    
    In response to Tony1963

  • Tony1963 Said:
Mad Professor - my apologies. When I mentioned a "line wrench" I was referring to the wrench that grips the end of the nut on five sides.

Sometimes referred to also as flare nut wrenches.

https://www.amazon.com/Crescent-CFNWS1-Metri c-Flar...



No problem. I sort of understood your meaning.

I've had old USA Craftsman tubing wrenches since the 1970s. Problem is they don't get into the space on the inside of the framerail to be useful.

They will fit on the nut, but then you can't turn it.

I got a set of crowfoot tubing wrenches. The 3/8" would fit on the tubing nut, then I could get a 3" 3/8" extension on it and turn it with a ratchet.


I've got one side done now.

Happy T-day......I'm doing the other side this afternoon.....

62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
85 C10 305, SM465
89 S10 baja package







 
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