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#1 |
On a budget like Fred Sanford
Join Date: Oct 2005
Location: Topeka, KS
Posts: 2,031
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front brakes: 1" vs 1.25"
What all is different in the front brake system between the 1" and 1.25" rotors? Is it just the rotors and spindle or are the calipers and pads different too? I've got 1.25" rotors on my truck and want to swap to the 1" setup to fit the new lowering spindles I picked up. What all parts do I need?
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'85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD |
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#2 |
Registered User
Join Date: Jun 2009
Location: Lubbock, TX
Posts: 1,671
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Re: front brakes: 1" vs 1.25"
You will indeed need the rotors (of course) and calipers as well, and with that I believe pads, but can't quote me on that.
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2006 GMC Sierra CCSB, 6.0 swap 2000 Chevy C3500 Crew Cab shortbed dually 1999 Chevy c2500 Crew Cab shortbed 1982 El Camino 350/350 1979 K5 2wd blazer bagged/bodied 1986 Monte Carlo SS 1991 Chevy CK SWB-67 clip and tailgate, bagged 350/700r4 1955 Chevy Bel Air 2014 Chevy Silverado ccsb |
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#3 |
Registered User
Join Date: Mar 2009
Location: pueblo CO
Posts: 86
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Re: front brakes: 1" vs 1.25"
i did this same swap the pads are the same you will need calipers rotors and brake lines for the 11x2" brake set up
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#4 |
On a budget like Fred Sanford
Join Date: Oct 2005
Location: Topeka, KS
Posts: 2,031
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Re: front brakes: 1" vs 1.25"
The rubber brake lines are different too?
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'85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD |
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#5 |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,698
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Re: front brakes: 1" vs 1.25"
No.
EDIT: I stand corrected by post below.
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 Last edited by lolife99; 08-12-2010 at 08:48 PM. |
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#6 |
Registered User
Join Date: Mar 2009
Location: pueblo CO
Posts: 86
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Re: front brakes: 1" vs 1.25"
yes the ends that go on the calibers are different first pic is for 1.25" set up and second is for 1"
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#7 |
I really hate wet sanding!
![]() Join Date: Dec 2008
Location: Brookfield, MO
Posts: 601
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Re: front brakes: 1" vs 1.25"
Are the wheel bearings, races, and grease seals the same....not that it matters to me but the original poster will probably need to know this.
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Jeff, 68 C-10 75 C-20, now a C-10! 10 F-150 |
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#8 |
Registered User
Join Date: Mar 2009
Location: pueblo CO
Posts: 86
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Re: front brakes: 1" vs 1.25"
forgot that part but yes they are different
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#9 |
On a budget like Fred Sanford
Join Date: Oct 2005
Location: Topeka, KS
Posts: 2,031
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Re: front brakes: 1" vs 1.25"
Thanks guys, yet another parts store run tonight I guess!
This budget lowering job (shackles/hangers/spindles) has now cost me over twice as much as I planned on, and about 5x as much time. ![]()
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'85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD |
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#10 | ||
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: front brakes: 1" vs 1.25"
Quote:
A well engineered kit is far easier to deal with and generally pretty predictable. (lowering or lifting)
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You can review the site's rules here. Quote:
Bad planning on your part does not necessarily constitute an instant emergency on my part.... The great thing about being a pessimist is that you are either pleasantly surprised or right. ![]() |
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#11 | |
On a budget like Fred Sanford
Join Date: Oct 2005
Location: Topeka, KS
Posts: 2,031
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Re: front brakes: 1" vs 1.25"
Quote:
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'85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD |
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#12 | |
Registered User
Join Date: Dec 2003
Location: Waller, TX
Posts: 57
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Re: front brakes: 1" vs 1.25"
Quote:
I used to lower a lot of trucks, and this is a typical issue. Most all C10's have 1.25" brakes in my experience. I think the only C10's with 1" brakes would have to have been the 6 cyl trucks. I guess there should be a "lowering FAQ" here on the forum that has information like "be sure to actually measure your brake rotors before orderering drop spindles" might save someone some headache.
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2004 Chevy Silverado 1500 RCSB 4.8v8 5 speed 2002 GMC Sierra 1500 RCSB 4.8v8 auto (wifes truck) 1986 Chevy Caprice 5.0 auto (like driving a couch down the road) 1982 Chevy C30 Crew Cab 2wd LWB - Beater Truck (I have more!) Too many to list! |
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#13 |
Registered User
Join Date: Dec 2003
Location: Waller, TX
Posts: 57
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Re: front brakes: 1" vs 1.25"
Never had an issue with Driveshaft length though. You must have put a manual trans in your truck, most came with an Auto? I never had issues with Drive shaft length when lowering a standard amount, like 2,4,6 inch drop kits for rear.
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2004 Chevy Silverado 1500 RCSB 4.8v8 5 speed 2002 GMC Sierra 1500 RCSB 4.8v8 auto (wifes truck) 1986 Chevy Caprice 5.0 auto (like driving a couch down the road) 1982 Chevy C30 Crew Cab 2wd LWB - Beater Truck (I have more!) Too many to list! |
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#14 |
Senior Member
Join Date: Aug 2004
Location: Everett, WA
Posts: 2,316
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Re: front brakes: 1" vs 1.25"
Potential dumb question, but the 1" vs. 1.25" refers to the thickness of the rotors right?
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2009 Honda Fit CfC (bsf 44.9 mpg) 2000 Tahoe Limited 1991 GMC CrewCab Dually 2wd, will end up swb, not dually and replace CCswb below 1991 GMC CrewCab Dually 4x4, just going to fix things up for now 1982/1989 K5/GMC Jimmy 2wd 1987 GMC 1/2 ton swb 2wd Crew (sold) |
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#15 | |||
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: front brakes: 1" vs 1.25"
Quote:
Quote:
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__________________
You can review the site's rules here. Quote:
Bad planning on your part does not necessarily constitute an instant emergency on my part.... The great thing about being a pessimist is that you are either pleasantly surprised or right. ![]() |
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#16 | |
On a budget like Fred Sanford
Join Date: Oct 2005
Location: Topeka, KS
Posts: 2,031
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Re: front brakes: 1" vs 1.25"
Quote:
shimp: Yes I swapped the M21 into my truck and the drive shaft isn't the original. I don't remember what I got it from, but it fit so I used it! Was just an inch too long after dropping the truck 4".
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'85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD |
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#17 | |
Registered User
Join Date: Jan 2009
Location: Kansas city
Posts: 756
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Re: front brakes: 1" vs 1.25"
Quote:
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#18 |
Registered User
Join Date: Apr 2015
Location: Heber city, Utah
Posts: 28
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Re: front brakes: 1" vs 1.25"
Sorry to resurrect a dead post but does anyone have part numbers for the 1.25 calipers, lines, etc..?
My parts catalog just lists RPO codes and I'm having trouble finding which is which thanks Last edited by rocket_customz; 02-03-2017 at 11:51 AM. |
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#19 |
Diggin The SquareLife
Join Date: Dec 2010
Location: garland,tx
Posts: 1,933
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Re: front brakes: 1" vs 1.25"
Any auto parts store should have that info on their website they ask u what brakes u have when y buy then in person
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#20 |
Registered User
Join Date: Nov 2016
Location: El Paso, TX
Posts: 10
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Re: front brakes: 1" vs 1.25"
Hello everyone,
Not wanting to take over this post, but i figure it was the most appropriate and recent post. I've been reading many of the posts on here, and i have a 1960 that i already swapped in a 1985 front suspension. however my front suspension doesn't have the rotors for me to measure. I want to use the 91 camaro rotor so i can have the 5 on 4.75 bolt pattern as i already have some skinnies for the front and its not a DD so the thinner rotor is no big deal. Like i said, i read several post but my question is how do i know what spindle i have, i know i need the spindle for 1" rotor to be able to use the camaro rotors. These are the measurements i got so far. 2.0" at the base of the spindle where the bearing sits 1.37" where the inner bearing sits 0.84" where the outer bearing sits If anyone has the measurement for the 1" and 1 1/4" rotor spindle that would help me out. |
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#21 |
Diggin The SquareLife
Join Date: Dec 2010
Location: garland,tx
Posts: 1,933
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Re: front brakes: 1" vs 1.25"
pretty sure u have the 1" spindle don't think they had that option in later years think it stopped in 82
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#22 |
Registered User
Join Date: Nov 2016
Location: El Paso, TX
Posts: 10
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Re: front brakes: 1" vs 1.25"
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#23 |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,194
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Re: front brakes: 1" vs 1.25"
Here's the brake release chart for '87 (should be the same for '85 - I just happened to have this one handy).
The 1" rotor goes on the manual brake applications (JB1), and the lightest duty power system (JB3). The majority of the vehicles were built with the 1.25 rotor (JB5 system). K ![]()
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#24 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,964
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Re: front brakes: 1" vs 1.25"
The difference in spindles (Which ones do I have?) can be verified by checking what wheel bearings fit since the 1" brake rotors use different (inner?) bearings.
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#25 |
Registered User
Join Date: Nov 2016
Location: El Paso, TX
Posts: 10
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Re: front brakes: 1" vs 1.25"
Well i picked up some bearings from the parts store and apparently i have the spindles that go with the 1.25" rotors so the camaro rotor swap is out unless i get aftermarket lowering spindles or stock 1" spindles. Since the truck is not a DD im having the rotors drilled for now while decide. Thanks for the info.
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