New caliper and hose leaking - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cfan10 · 06-20-2024, 03:19 PM

Installed new caliper and hose and it is still leaking from the bolt where the brake hose connects to the caliper. This is my daily driver I need to get back to work tomorrow. Any advice is greatly appreciated. Missed two days this week already!

**HOTFUN** · 06-20-2024, 06:57 PM

Ive been running into this on my 73 rebuilt calipers and sold by Rockauto. Apparently the remans use a oversized 10 mm bolt that is a 20mm length and the reman process they over bore the bolt casting in caliper to 11mm and place this 20mm bolt in. NO one I could find sells a 25-30mm 11mm bolt out there. Only about 3 threads catch after using your banjo style brake hose with both copper washers in place. I tried Nugen and then a Cardone and same. I finally bought a set of NOS Delco calipers to use original gm brake hose bolts. Perfect leak free fit like genuine GM parts! Next to that I would look for a set of original calipers that have not been bored to an off size and rebuild them.

72c20customcamper · 06-20-2024, 07:00 PM

Did you use new cooper crush washer? I’ve had leaks and had to tighten the banjo more than I was comfortable with but the leaks stopped .

New or rebuilt ? Rebuilds sometimes don’t have a smooth mating surface for the crush washer

Honest Bob · 06-20-2024, 07:36 PM

Quote:

Originally Posted by 72c20customcamper

Did you use new cooper crush washer? I’ve had leaks and had to tighten the banjo more than I was comfortable with but the leaks stopped .

New or rebuilt ? Rebuilds sometimes don’t have a smooth mating surface for the crush washer

Ive run into the same issue. They seem tight enough to nearly break off but one last umph gets it to stop leaking.

cfan10 · 06-22-2024, 01:44 PM

Quote:

Originally Posted by Honest Bob

Ive run into the same issue. They seem tight enough to nearly break off but one last umph gets it to stop leaking.

Tried that with another caliper and snapped the bolt off, going to find the oem one and pray it works because I've already installed this one which is a oreillys unit vs. the detriot axle one in photo.

06-20-2024, 03:19 PM	#1
cfan10 Registered User Join Date: May 2011 Location: Texas Posts: 977	New caliper and hose leaking Installed new caliper and hose and it is still leaking from the bolt where the brake hose connects to the caliper. This is my daily driver I need to get back to work tomorrow. Any advice is greatly appreciated. Missed two days this week already! __________________ Rest In Peace:Mikhail {Mickey Rooney} Alpha 2/5/13 Omega 7/22/14 10:28AM I love you tremendously and outragiously Superpuppi Thai Ridgeback...The most intelligent dog known to me. Don't mess with my truck, my momma or my money...not necessarily in that order. © Stand for something or fall for anything. [LIST][*]'98 Bourbon St. Brawl ©2010

06-20-2024, 06:57 PM	#2
HOTFUN Senior Member Join Date: Jan 2001 Location: Lincoln, Nebraska Posts: 2,144	Re: New caliper and hose leaking Ive been running into this on my 73 rebuilt calipers and sold by Rockauto. Apparently the remans use a oversized 10 mm bolt that is a 20mm length and the reman process they over bore the bolt casting in caliper to 11mm and place this 20mm bolt in. NO one I could find sells a 25-30mm 11mm bolt out there. Only about 3 threads catch after using your banjo style brake hose with both copper washers in place. I tried Nugen and then a Cardone and same. I finally bought a set of NOS Delco calipers to use original gm brake hose bolts. Perfect leak free fit like genuine GM parts! Next to that I would look for a set of original calipers that have not been bored to an off size and rebuild them. __________________ '66 CST BBW swb fleet 327 fac ac '67 CST 4x4 swb 327 stepside project '72 Cheyenne K20 50k original '72 Cheyenne Super K20 project '73 Sierra swb 4x4 frame off in paint stage '74 Cheyenne Super swb w/16k actual '71 & 72 Cheyenne K10 4x4 swb's '70 426 HEMICUDA conv SHAKER 4 sp Dana 60 '60 Impala conv 327 PG fac ac loaded 3rd owner '72 GMC K2500 4x4 '59 Apache CST BBW fleetside swb 283 '73 ElCamino SS LS1 T56 true SS bucket tach '76 ElCamino SS 52k survivor '87 Grand National 41k True 2nd to last built in 1987. '86 K30 454 SRW fleetside CA since new '88 Trans Am GTA 39k bought new 2018 DEMON plum crazy @ 840HP! "Need for speed" Last edited by HOTFUN; 06-20-2024 at 07:03 PM.

06-20-2024, 07:00 PM	#3
72c20customcamper Registered User Join Date: Jul 2018 Location: Catskill Mountains,NY Posts: 8,318	Re: New caliper and hose leaking Did you use new cooper crush washer? I’ve had leaks and had to tighten the banjo more than I was comfortable with but the leaks stopped . New or rebuilt ? Rebuilds sometimes don’t have a smooth mating surface for the crush washer __________________ Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary.



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