Brake adjustment on GM
 

Brake adjustment on GM

Started by richard5933, July 12, 2018, 03:36:51 PM

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richard5933

Curious how others accomplish brake adjustment on their GM coaches, particular the 4108 or Buffalo series. It seems impossible to safely reach the slack adjusters without being under the bus, and the manual states that the wheels need to spin to properly adjust. The manual states tighten till drag is felt, then back off till the wheel spins freely.

Am I reading all this to mean that to correctly adjust the brakes (which the manual states should be done every 2000 miles) that everyone is jacking/blocking the bus up and going through this whole procedure? Am I missing something? Is there an easier and/or safer method?
Richard
1974 GMC P8M4108a-125 Custom Coach "Land Cruiser" (Sold)
1964 GM PD4106-2412 (Former Bus)
1994 Airstream Excella 25-ft w/ 1999 Suburban 2500
Located in beautiful Wisconsin

eagle19952

I've adjusted a lot of brakes in my day. Put me in the group that has done it wrong if jacking is a requirement.
Hundreds maybe thousands of adjustments without incident and never a jack.
Donald PH
1978 Model 05 Eagle w/Torsilastic Suspension,8V71 N, DD, Allison on 24.5's 12kw Kubota.

chessie4905

Probably, but I have a pit. Sucks without one.
GMC h8h 649#028 (4905)
Pennsylvania-central

Dave5Cs

On MCI 5C in the book it states, that you can do it that way but if on the ground measure the throw of the slack from where it rests to where it extends should be between 1-1/4" to 1-3/4". The rears are pretty tough to do without taking off the tires but can be done. :)

Also must add, here ours are DD3's
"Perfect Frequency"1979 MCI MC5Cs 6V-71,644MT Allison.
2001 Jeep Cherokee Sport 60th Anniversary edition.
1998 Jeep TJ ,(Gone)
Somewhere in the USA fulltiming.

richard5933

Quote from: eagle19952 on July 12, 2018, 03:46:45 PM
I've adjusted a lot of brakes in my day. Put me in the group that has done it wrong if jacking is a requirement.
Hundreds maybe thousands of adjustments without incident and never a jack.
If not jacking, then how? Block the body and slide under on a creeper?
Richard
1974 GMC P8M4108a-125 Custom Coach "Land Cruiser" (Sold)
1964 GM PD4106-2412 (Former Bus)
1994 Airstream Excella 25-ft w/ 1999 Suburban 2500
Located in beautiful Wisconsin

Dave5Cs

I use my ramps on the back and put a 3 inch block between the bump-stops on rear and just turn the wheels out on the front and reach in.
"Perfect Frequency"1979 MCI MC5Cs 6V-71,644MT Allison.
2001 Jeep Cherokee Sport 60th Anniversary edition.
1998 Jeep TJ ,(Gone)
Somewhere in the USA fulltiming.

eagle19952

What he said. ^^

My point is the part about spinning the wheel.
I use the thud-ring test.
it thuds its too tight it rings its loose add 1/3 to 1/2 turn.
of course throw dimension dictates
Donald PH
1978 Model 05 Eagle w/Torsilastic Suspension,8V71 N, DD, Allison on 24.5's 12kw Kubota.

dtcerrato

Dan & Sandy
North Central Florida
PD4104-129 since 1979
Toads: 2009 Jeep GC Limited 4X4 5.7L Hemi
             2008 GMC Envoy SLT 4x4 4.2L IL Vortec