Author Topic: Front brakes locking up question.  (Read 2979 times)

Offline TinCuda

  • Sr. Member
  • ****
  • Posts: 1288
    • 'Cuda
Front brakes locking up question.
« on: March 17, 2012 - 08:59:50 PM »
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.
(O O [             SRT ] O O)
(O O {]{]{]||[}[}[} O O)
{||O||}

2016 Dodge Challenger Hellcat
1971 Plymouth 'Cuda 440-6
2008 Dodge Charger R/T Hemi
2015 Chrysler 200c AWD 3.6L
2000 Yamaha V-Max
Doing my part to leave a big carbon footprint!
Image Hosted by ImageShack.us
Shot at 2012-09-05




Offline wiging19

  • Full Member
  • ***
  • Posts: 601
Re: Front brakes locking up question.
« Reply #1 on: March 18, 2012 - 02:31:09 AM »
are the disc brakes slidders or pin? 

Offline Bullitt-

  • Permanent Resident
  • *******
  • Posts: 12167
  • Better Things To Come Member Since 2/16/06
Re: Front brakes locking up question.
« Reply #2 on: March 18, 2012 - 07:41:32 AM »
I've read that if the rod sticking out of the booster is to long pressure is not released, there should be a nut on the end of the rod for adjustment. 
Wade  73 Rallye 340..'77 Millennium Falcon...13 R/T Classic   Huntsville, AL
Screwed by Photobucket!

Offline mopar12372

  • Sr. Member
  • ****
  • Posts: 1163
    • mopartech
Re: Front brakes locking up question.
« Reply #3 on: March 18, 2012 - 09:47:31 AM »
 are the rear brakes adjusted ?   the rear brake pads good ?  are the rear wheel cylinders leaking or sticking ?  is the proportional valve  working ? do you have really skinny tall tires on the front?  does the car pull to one side or another when brakeing ? do you hear anything grinding front or rear while driveing  ? do you hear anything grinding or rubbing while brakeing ?  do you drive with your foot on the brake pedal ? are your wheel bearings good ?
MOPARTECH.NET ( come over and visit some time )
RESTO PICTURES
http://www.cuda-challenger.com/cc/index.php?topic=71096.30

Offline TinCuda

  • Sr. Member
  • ****
  • Posts: 1288
    • 'Cuda
Re: Front brakes locking up question.
« Reply #4 on: March 19, 2012 - 03:02:06 AM »
are the rear brakes adjusted ?   the rear brake pads good ?  are the rear wheel cylinders leaking or sticking ?  is the proportional valve  working ? do you have really skinny tall tires on the front?  does the car pull to one side or another when brakeing ? do you hear anything grinding front or rear while driveing  ? do you hear anything grinding or rubbing while brakeing ?  do you drive with your foot on the brake pedal ? are your wheel bearings good ?


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 and the wheel spin freely again until I drive the car.
(O O [             SRT ] O O)
(O O {]{]{]||[}[}[} O O)
{||O||}

2016 Dodge Challenger Hellcat
1971 Plymouth 'Cuda 440-6
2008 Dodge Charger R/T Hemi
2015 Chrysler 200c AWD 3.6L
2000 Yamaha V-Max
Doing my part to leave a big carbon footprint!
Image Hosted by ImageShack.us
Shot at 2012-09-05

Offline Cooter

  • Sr. Member
  • ****
  • Posts: 1207
  • There goes the lone Challenger............
    • christinecarclub.com
Re: Front brakes locking up question.
« Reply #5 on: March 19, 2012 - 08:00:42 AM »
What about the brake hoses? I've seen these come apart inside and cause a "Trap door" effect causing what you describe.
1958 plymouth Belvedere 2dr hd top "Christine" [OO)====V====(OO]
1969 dodge Charger "General Lee"         [___|______I______|___]                        
1968 Dodge Dart 2dr sedan 505" Stroker    (O]=0==========0=[O)                
1970 Challenger R/T Clone "Kowalski Special"   (OO) [___________] (OO)

Offline TinCuda

  • Sr. Member
  • ****
  • Posts: 1288
    • 'Cuda
Re: Front brakes locking up question.
« Reply #6 on: March 19, 2012 - 03:54:22 PM »
What about the brake hoses? I've seen these come apart inside and cause a "Trap door" effect causing what you describe.

Yeah, those are brand new also.


.,
(O O [             SRT ] O O)
(O O {]{]{]||[}[}[} O O)
{||O||}

2016 Dodge Challenger Hellcat
1971 Plymouth 'Cuda 440-6
2008 Dodge Charger R/T Hemi
2015 Chrysler 200c AWD 3.6L
2000 Yamaha V-Max
Doing my part to leave a big carbon footprint!
Image Hosted by ImageShack.us
Shot at 2012-09-05