No adjustment hole for rear brakes - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

andyh1956 · 10-19-2018, 01:03 PM

I bet this is why people go to Disc Brakes in the rear!

**hatzie** · 10-19-2018, 05:14 PM

The 14bolt axles on my 76 & my T400 have the slots in the backer plates.
I'd leave the drum as-is for balance reasons... but I'm not above doing some amateur machining on the back plates with a cobalt drill bit and a file.

Tom · 10-19-2018, 06:30 PM

All my trucks have no backing plate hole for adjustment. You pull the drum, adjust, then install the drum and check. Pretty simple really.

Bandit130 · 10-19-2018, 09:00 PM

Mine has the adjustment slot in drum accessed from outside. Have to rotate wheel to 6 o'clock position for adjustment. Do not need to remove wheel.

Pontiac1976 · 10-21-2018, 05:15 PM

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Join Date: Mar 2011

Location: Coos Bay , Oregon

Posts: 269

Quote:

Re: No adjustment hole for rear brakes

This must be an oddball truck no knockouts to be found ., maybe Canadian trucks did not have them .

This Not a Canadian thing as Canada does not make break parts as (drums/rotor, pads/ shoes) or there all USA made out source to Asia to save money. The one with no hole you got are cheaper drums or your meant to pop out the knock hole.

10-19-2018, 01:03 PM	#26
andyh1956 Registered User Join Date: Mar 2010 Location: thomastown mississippi Posts: 1,261	Re: No adjustment hole for rear brakes I bet this is why people go to Disc Brakes in the rear!

10-19-2018, 05:14 PM	#27
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,975	Re: No adjustment hole for rear brakes The 14bolt axles on my 76 & my T400 have the slots in the backer plates. I'd leave the drum as-is for balance reasons... but I'm not above doing some amateur machining on the back plates with a cobalt drill bit and a file. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

10-19-2018, 06:30 PM	#28
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,738	Re: No adjustment hole for rear brakes All my trucks have no backing plate hole for adjustment. You pull the drum, adjust, then install the drum and check. Pretty simple really. __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.

10-19-2018, 09:00 PM	#29
Bandit130 Registered User Join Date: Dec 2014 Location: Euless, Texas Posts: 516	Re: No adjustment hole for rear brakes Mine has the adjustment slot in drum accessed from outside. Have to rotate wheel to 6 o'clock position for adjustment. Do not need to remove wheel. __________________ 1974 Cheyenne 10 LWB Stock 350 W/HEI /TH350/AC/4 BBL Quadrajet Mopar by Birth Chevy by Choice



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