Front brake flexi hoses fitment change thru model year? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

J1MMY · 10-17-2015, 05:48 AM

I've been looking for replacement flexis and I've noticed that some outlets list '73-'78 and '79-'87 differently. Was there a change in thread pitch or from UNF/UNC to metric?

('79 C10)

ray_mcavoy · 10-17-2015, 08:42 PM

Yes, I believe that was right around the time when GM changed from standard to metric threads on the banjo bolts that attach the flex lines to the calipers.

The earlier banjo bolts have 7/16"-20 threads while the later ones are M10-1.5.

J1MMY · 10-24-2015, 11:37 AM

Then it would appear that I have one of each - 7/16-20 on the left...

10-17-2015, 05:48 AM	#1
J1MMY Registered User Join Date: Aug 2009 Location: Wiltshire, UK Posts: 157	Front brake flexi hoses fitment change thru model year? I've been looking for replacement flexis and I've noticed that some outlets list '73-'78 and '79-'87 differently. Was there a change in thread pitch or from UNF/UNC to metric? ('79 C10) __________________ '63 C10 Longbox fleetside '94 C1500 Sierra ex-USAF beater

10-17-2015, 08:42 PM	#2
ray_mcavoy Registered User Join Date: Nov 2009 Location: Sherman, ME Posts: 2,366	Re: Front brake flexi hoses fitment change thru model year? Yes, I believe that was right around the time when GM changed from standard to metric threads on the banjo bolts that attach the flex lines to the calipers. The earlier banjo bolts have 7/16"-20 threads while the later ones are M10-1.5.

10-24-2015, 11:37 AM	#3
J1MMY Registered User Join Date: Aug 2009 Location: Wiltshire, UK Posts: 157	Re: Front brake flexi hoses fitment change thru model year? Then it would appear that I have one of each - 7/16-20 on the left... __________________ '63 C10 Longbox fleetside '94 C1500 Sierra ex-USAF beater



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