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Front disc brakes locking up question.
#1198698
03/17/12 11:37 PM
03/17/12 11:37 PM
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Joined: Aug 2011
Posts: 297 Oklahoma
TinCuda
OP
enthusiast
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OP
enthusiast
Joined: Aug 2011
Posts: 297
Oklahoma
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1971 Plymouth 'Cuda 440-6 power brakes with stock front disc, rear drum.
Both of my front brakes seem to be locking up. The car drives and stops fine. I can't feel the brakes drag and the car does not pull to one side or the other when I apply the brakes or when cruising. I noticed a lot of brake dust on the front wheels so I jacked the front end of my car up and both front wheels where really hard to spin by hand, like really hard. Both rear wheels are fine. The parts that are new or freshly overhauled: power booster, master cylinder, both calipers, discs and pads. At that point, I replaced the master cylinder with a different overhauled one. Same problem. If I let the car set for a while, the pressure lets off until I drive the car again. Any ideas?
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(O O {]{]{]||[}[}[} O O)
1971 Plymouth 'Cuda 440-6
{||O||}
2000 Yamaha V-Max
(O O [========= SRT] O O)
2011 Dodge Challenger SRT 392
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Making as big as a carbon footprint as I can!!!
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Re: Front disc brakes locking up question.
[Re: TinCuda]
#1198699
03/17/12 11:43 PM
03/17/12 11:43 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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take off the line from the M/C port next to the firewall and stick a drill bit deep down into the brass cone seat & you'll feel the springy RPV if it has one. Thread a screw into the cone and lever it out then toss the RPV then replace the brass cone seat. If it has no RPV check that the calipers ain't hanging up on the grooves (sliders) & if good there replace the calipers. Some calipers dont retract the piston enough for minimal drag. EDIT I'm assuming the line next to the firewall goes to the front discs
Last edited by RapidRobert; 03/18/12 12:16 AM.
live every 24 hour block of time like it's your last day on earth
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Re: Front disc brakes locking up question.
[Re: Kern Dog]
#1198701
03/18/12 04:34 AM
03/18/12 04:34 AM
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Joined: Aug 2003
Posts: 12,291 Kent, Wa
340SHORTY
Truck Nut
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Truck Nut
Joined: Aug 2003
Posts: 12,291
Kent, Wa
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Id crack the front line open to see if there is pressure. If so check to see if the front wheels are hard to turn still.
or crack 1 caliper at a time. if they are holding pressure its possible that the rubber lines are bad.
I am truckless..
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Re: Front disc brakes locking up question.
[Re: DAYCLONA]
#1198706
03/18/12 04:59 PM
03/18/12 04:59 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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Missed that it was power brakes. I bet Dayclona nailed it, not enough clearance
live every 24 hour block of time like it's your last day on earth
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