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09-27-07, 08:40 PM
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#1 (permalink)
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Forum Lifer
Join Date: May 2002
Location: Jackson, MS
Posts: 3,727
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4 wheel drum diagnosis
Need a little help with diagnosis.
stock 4 wheel drum system
All 8 cylinders new. New shoes all around. Adjusted them all so that the shoes drag on the new drums.
Bleed it out 6 ways to sunday. Pedal to the floor on first pump then rising to a good pedal on more pumps. Wait 5 seconds, back to the floor. We were sure it didn't have air, so I thought it was the master.
New master, bench bleed, super bleed the system, same symptoms.
Thinking it has to be air, we did a loop with brake tube to flush fluid through the MC back into the resivoir. 150 or so pumps, only 2 air bubbles.
Gravity bleed the whole system for 2 hours, still no luck.
Thoughts?
I know, I know... convert to disks. Any other thoughts?
__________________
Greg Thompson
89 FJ62, Unstock.
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09-27-07, 09:01 PM
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#2 (permalink)
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Oh...Durka Durka Durka.
Join Date: Oct 2003
Location: in the shop
Posts: 16,034
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Adjust your brake shoes, again.
I bet that the shoes are not centered on the drum...
No really, that is your problem.
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09-27-07, 09:10 PM
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#3 (permalink)
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Forum Regular
Join Date: Oct 2006
Location: I live in Wyoming, lived here 36 yrs.
Posts: 74
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Same problem I have on my cruiser with the exact same new parts. I have pumped the pedal and bled gallons of brake fluid through the system so many times it makes me sick to even think of doing it again.
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09-27-07, 09:10 PM
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#4 (permalink)
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Forum Lifer
Join Date: May 2002
Location: Jackson, MS
Posts: 3,727
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Quote:
Originally Posted by Poser
Adjust your brake shoes, again.
I bet that the shoes are not centered on the drum...
No really, that is your problem.
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K. TKS.
__________________
Greg Thompson
89 FJ62, Unstock.
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09-27-07, 11:49 PM
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#5 (permalink)
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elder statesman
Join Date: Apr 2004
Location: so cal, going 45
Posts: 8,309
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Quote:
Originally Posted by Poser
Adjust your brake shoes, again.
I bet that the shoes are not centered on the drum...
No really, that is your problem.
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What he said.  It's that simple. Try driving the truck back and forth down the driveway a few times in each direction, braking at both ends. It will help the shoes center faster.
Mark A.
__________________
A carbureted man in a fuel injected world.
65SWB45, 64LWB45, 68FJ40,72V840, 76HJ45[gone],84FJ60[gone], 76K5, 73Sub454, 97Sub5.7, 2002 Trailblazer
TLCA delegate, Trail Crew-LAC TLCA, The White Trash of the Elwood Chapter
my website:
http://www.marksoffroad.net
IT'S FASTER if you CALL ME!
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09-28-07, 03:35 PM
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#6 (permalink)
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Forum Regular
Join Date: Jun 2005
Posts: 39
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manually adjusting brakes should be outlawed ... X10 on readjust the shoes
arndog
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09-28-07, 04:53 PM
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#7 (permalink)
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250+ Club
Join Date: Nov 2003
Location: Mountaintop, Pa
Posts: 440
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I agree with the above.. When I do drums I crank them up till they stop the wheels, bleed, crank them up again bleed and then back 'em off to proper adjustment . One mistake I had on a dana 60 was I went the wrong way and thought I heard them scraping/touching. Well after a new master/ rubber lines and 2 gals of fluid I check the drums only to find out I went the wrong way. 15mins later I was cruising.
bob
__________________
I cut this wire 3 times and it's still to short.
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euclid
Poser
1969 Toyota Land Cruiser, FJ-40
65swb45
