L/D or H/D brakes when buying wheel bearings? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

buhler1 · 10-20-2008, 11:19 PM

Hi guys. I really appreciate all the great info on this site.

I'm putting ECE dropped spindles on my 72 SWB and when I went to buy new wheel bearings, there was a choice between Heavy Duty and Light Duty brakes. I assumed Light Duty (A6) but when I went to match them up with the new spindles, it looks like the inners are too small. Am I right in assuming I just need to go back and get the larger inner bearings (A5) and retain the outer (A3) because they are the same for both versions?

Also have a question on the relay that runs the high fan speed for the HVAC. It seems the high speed no longer works on my blower. Where is the relay located?

Thanks for the help.

Al

Longhorn Man · 10-21-2008, 05:29 AM

Honestly, I am not familiar with a HD brake for the front of a disk brake truck.

The blower motor relay, for a stock A/C truck, is on the bassenger side over the heater box... basicly behind the glove box.

chevy_mike · 10-21-2008, 12:22 PM

My understanding is there are two sizes of rotor thickness. 1" and 1.25" (aka LD and HD). I thought '71/'72 factory rotors were the 1.25" thick ones, hence HD. I think it was later in the years (late '70 early '80) when the two different options were available.

When all else fails, call ECE as I know they are more then happy to help!

sneakysnake · 10-21-2008, 01:16 PM

Here's a relay pic

Longhorn Man · 10-21-2008, 03:15 PM

chevy mike... you are right as far as I know. I should have said i was not familiar with a HD brake for the front of a 71/72 truck

buhler1 · 10-21-2008, 06:04 PM

Thanks very much. I bought the correct inner ones today and should be all set. Also thanks for the relay photo. Very helpful.

This is a fun truck and I bought it as one that was "done". But they are never really done.

If I chase a few more leaks, stop a few more rattles, detail a few more parts, then it might be done. But then what would I have to do with my weekends, right?

Again, thanks guys. I really appreciate it.

Al

10-20-2008, 11:19 PM	#1
buhler1 Registered User Join Date: Dec 2007 Location: Bloomington, Illinois Posts: 9	L/D or H/D brakes when buying wheel bearings? Hi guys. I really appreciate all the great info on this site. I'm putting ECE dropped spindles on my 72 SWB and when I went to buy new wheel bearings, there was a choice between Heavy Duty and Light Duty brakes. I assumed Light Duty (A6) but when I went to match them up with the new spindles, it looks like the inners are too small. Am I right in assuming I just need to go back and get the larger inner bearings (A5) and retain the outer (A3) because they are the same for both versions? Also have a question on the relay that runs the high fan speed for the HVAC. It seems the high speed no longer works on my blower. Where is the relay located? Thanks for the help. Al

10-21-2008, 05:29 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: L/D or H/D brakes when buying wheel bearings? Honestly, I am not familiar with a HD brake for the front of a disk brake truck. The blower motor relay, for a stock A/C truck, is on the bassenger side over the heater box... basicly behind the glove box.

10-21-2008, 12:22 PM	#3
chevy_mike Never Ending Projects Join Date: Jul 2006 Location: San Diego, CA Posts: 3,836	Re: L/D or H/D brakes when buying wheel bearings? My understanding is there are two sizes of rotor thickness. 1" and 1.25" (aka LD and HD). I thought '71/'72 factory rotors were the 1.25" thick ones, hence HD. I think it was later in the years (late '70 early '80) when the two different options were available. When all else fails, call ECE as I know they are more then happy to help! __________________ . 1965 C10 Panel, Tiki Express http://www.67-72chevytrucks.com/vboa...d.php?t=506580 SOLD 1968 Chevy C10, Long, Fleetside, Hot Rod Hauler http://67-72chevytrucks.com/vboard/s...d.php?t=313233 SOLD 1965 Chevy C10, Long, Fleetside, Hot Rod C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415702 SOLD We were given two ears and one mouth for a reason... listen twice as much and speak half as often...

10-21-2008, 01:16 PM	#4
sneakysnake It's a catastrophic success. Join Date: Jan 2003 Location: Oklahoma Posts: 2,077	Re: L/D or H/D brakes when buying wheel bearings? Here's a relay pic Attached Images

10-21-2008, 03:15 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: L/D or H/D brakes when buying wheel bearings? chevy mike... you are right as far as I know. I should have said i was not familiar with a HD brake for the front of a 71/72 truck

10-21-2008, 06:04 PM	#6
buhler1 Registered User Join Date: Dec 2007 Location: Bloomington, Illinois Posts: 9	Re: L/D or H/D brakes when buying wheel bearings? Thanks very much. I bought the correct inner ones today and should be all set. Also thanks for the relay photo. Very helpful. This is a fun truck and I bought it as one that was "done". But they are never really done. If I chase a few more leaks, stop a few more rattles, detail a few more parts, then it might be done. But then what would I have to do with my weekends, right? Again, thanks guys. I really appreciate it. Al



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