Rear Drums slowly locking up when driving
#2510082
06/18/18 06:09 PM
06/18/18 06:09 PM
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Joined: Feb 2009
Posts: 1,149
NW New Jersey
RSI700VIPER
OP
super stock
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OP
super stock
Joined: Feb 2009
Posts: 1,149
NW New Jersey
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Just started driving my 1970 440-4BBL Challenger and discovered I have a rear drum brake issue. The brakes worked fine for about 8-10 miles, then I noticed the engine was laboring when I was pulling into my driveway. I barely made it to the garage door when the rear drums locked up. I could smell brake lining material, and check the rear drum temps with an infrared lazer gun and one drum was 290 degrees and the other was 310 degrees.
I figured is was an adjuster issue and let the car sit overnight. The next morning, I was able to roll the car easily with just the push of my hand. Took it out for another test ride and the problem happened all over again. My guess is that it is a hydraulic issue, and that the brake pressure slowly bleeds off from the wheel cylinders. The car is new to me so I don't have the history but it looks like it has a new Master cyl.
Last edited by RSI700VIPER; 06/18/18 06:10 PM.
1970 Superbird 440 Six BBL, 4-Speed, Dana, FJ5
1969 Daytona Charger 440 4-Speed, Dana, EV2
1971 340 Challenger Conv. Flemington Speedway Pace Car, FC7
1970 340 Six Pack Callenger T/A 4-speed T8 Tan
1971 340 Challenger RT Formal Roof, EV2 w/ V2 Stripe & Orange Houndstooth
1969 Talladega Torino, 428CJ
1969 Gurney Special Cyclone Spoiler II, 351 Cleveland
"Id rather have a bottle in front of me than a frontal lobotomy" Ben Franklin 1755
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Re: Rear Drums slowly locking up when driving
[Re: stumpy]
#2510127
06/18/18 08:22 PM
06/18/18 08:22 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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^^^ What Stump said & there just was a comprehensive thread on a pretty much identical situation (2 long shoes on one side iirc).
live every 24 hour block of time like it's your last day on earth
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Re: Rear Drums slowly locking up when driving
[Re: RSI700VIPER]
#2510128
06/18/18 08:24 PM
06/18/18 08:24 PM
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Joined: Feb 2010
Posts: 403
IL us
ink
mopar
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mopar
Joined: Feb 2010
Posts: 403
IL us
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^^^^^^^^^^^^^^^^^ x3
Last edited by ink; 06/18/18 08:25 PM.
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Re: Rear Drums slowly locking up when driving
[Re: RSI700VIPER]
#2510191
06/18/18 10:45 PM
06/18/18 10:45 PM
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Joined: Dec 2014
Posts: 5,748
ohio
ruderunner
master
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master
Joined: Dec 2014
Posts: 5,748
ohio
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A little more involved but, crack ableeder loose and see if the brakes release. If so it's a hydraulic problem.
Get it to do it again, crack the rear line loose at the master. Do brakes release? If so problem it s master or booster related. If not then hose, line or p valve related. Duplicate symptoms and crack line at various places, note the results.
Angry white pureblood male
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Re: Rear Drums slowly locking up when driving
[Re: ruderunner]
#2510209
06/18/18 11:19 PM
06/18/18 11:19 PM
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Joined: Feb 2009
Posts: 1,149
NW New Jersey
RSI700VIPER
OP
super stock
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OP
super stock
Joined: Feb 2009
Posts: 1,149
NW New Jersey
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A little more involved but, crack ableeder loose and see if the brakes release. If so it's a hydraulic problem.
Get it to do it again, crack the rear line loose at the master. Do brakes release? If so problem it s master or booster related. If not then hose, line or p valve related. Duplicate symptoms and crack line at various places, note the results. This seems to be a good approach. I will try and report back. The proportioning valve is stock and original but the MC is aftermarket...
1970 Superbird 440 Six BBL, 4-Speed, Dana, FJ5
1969 Daytona Charger 440 4-Speed, Dana, EV2
1971 340 Challenger Conv. Flemington Speedway Pace Car, FC7
1970 340 Six Pack Callenger T/A 4-speed T8 Tan
1971 340 Challenger RT Formal Roof, EV2 w/ V2 Stripe & Orange Houndstooth
1969 Talladega Torino, 428CJ
1969 Gurney Special Cyclone Spoiler II, 351 Cleveland
"Id rather have a bottle in front of me than a frontal lobotomy" Ben Franklin 1755
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Re: Rear Drums slowly locking up when driving
[Re: RSI700VIPER]
#2510541
06/19/18 10:07 PM
06/19/18 10:07 PM
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Joined: Jun 2006
Posts: 125
kalispell montana
jwilson 61
member
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member
Joined: Jun 2006
Posts: 125
kalispell montana
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Water in the brake fluid will cause this also, as the boiling point isn't as high as brake fluid and it expands when hot, brake fluid being hygroscopic absorbs water over time so needs to be changed at times to keep rust out of the system and things working correctly.
70 cuda 440 6bbl Auto with a dana 60
68 road runner QQ1 383 auto
1970 6 barrel 4 speed Superbird FY1 number matching
15 Challenger 6.4 SRT pearl White 6 Speed
72 Cuda 440 5 speed
71 Road Runner 440 4 speed
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Re: Rear Drums slowly locking up when driving
[Re: RSI700VIPER]
#2510693
06/20/18 09:38 AM
06/20/18 09:38 AM
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Joined: Jan 2003
Posts: 21,059
Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,059
Niles , Ohio
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Seems no one has said if it has self adjusters to check them.If backwards the brakes will adjust up everytime you use them going forward.Rocky
Chrysler Firepower
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Re: Rear Drums slowly locking up when driving
[Re: therocks]
#2510720
06/20/18 11:16 AM
06/20/18 11:16 AM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Seems no one has said if it has self adjusters to check them.If backwards the brakes will adjust up everytime you use them going forward.Rocky Except they don't unadjust when sitting overnight
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: Rear Drums slowly locking up when driving
[Re: therocks]
#2511024
06/20/18 08:21 PM
06/20/18 08:21 PM
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Joined: Jun 2006
Posts: 125
kalispell montana
jwilson 61
member
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member
Joined: Jun 2006
Posts: 125
kalispell montana
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Seems no one has said if it has self adjusters to check them.If backwards the brakes will adjust up everytime you use them going forward.Rocky But they are released once they cool off, Adjusters will stay tight ..
70 cuda 440 6bbl Auto with a dana 60
68 road runner QQ1 383 auto
1970 6 barrel 4 speed Superbird FY1 number matching
15 Challenger 6.4 SRT pearl White 6 Speed
72 Cuda 440 5 speed
71 Road Runner 440 4 speed
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Re: Rear Drums slowly locking up when driving
[Re: jwilson 61]
#2511182
06/21/18 02:04 AM
06/21/18 02:04 AM
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Joined: Aug 2003
Posts: 954
garnett kansas
rhad
super stock
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super stock
Joined: Aug 2003
Posts: 954
garnett kansas
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sounds like they are adjusted a little to tight and drag a little,the more you drive the more they heat and drag,when they cool they retract
my ladder of success is missing some rungs
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