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1975 270 Disc Brake pressure not releasing

Unread postby diskman on Sun Oct 09, 2016 1:55 pm

Winterizing the 270 today and decided to run to the gas station and put in a few gallons and some Sta-Bil.. Noticed that the front discs were dragging.. Decided to turn around and almost didn't make it home. VERY hot and smoking fronts.

I released the bleeders and high pressure fluid shot out of both. Was then able to drive to the gas station. Can still feel the fronts are not releasing all way.

Replaced front flex lines and some hard lines last June 2016 with new ones. Also rebuilt entire rear brakes and hardware at the same time.

Where do I start looking for the pressure problem?

Ideas?
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Re: 1975 270 Disc Brake pressure not releasing

Unread postby Acesneights on Mon Oct 10, 2016 8:02 pm

Does it have vacuum boosters or Hydraulic(runs of power steering)?
Your problem sounds typical of bad hydravac.
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1974 Travco 220 Parts unit
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Re: 1975 270 Disc Brake pressure not releasing

Unread postby diskman on Mon Oct 10, 2016 9:17 pm

Vacuum boosters. PO replaced them about 10 years ago.. Is there a test I can do? Or just throw $$$ at it? :p
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Re: 1975 270 Disc Brake pressure not releasing

Unread postby 77Travco on Tue Oct 11, 2016 2:12 pm

Could also be a an internally collapsed rubber brake line. I had that happen once on a 1 ton Chevy.
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Re: 1975 270 Disc Brake pressure not releasing

Unread postby KB2CRK on Wed Oct 12, 2016 11:59 am

77Travco wrote:Could also be a an internally collapsed rubber brake line. I had that happen once on a 1 ton Chevy.

Just had that happen with My 86 Dodge pick up.
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Re: 1975 270 Disc Brake pressure not releasing

Unread postby diskman on Wed Oct 12, 2016 4:31 pm

Hmm.. I *just* installed brand new lines 4 months ago...
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Re: 1975 270 Disc Brake pressure not releasing

Unread postby KB2CRK on Wed Oct 12, 2016 4:49 pm

[quote="diskman"]Hmm.. I *just* installed brand new lines 4 months ago...[/quote

Hoses or lines or both?
Hydrovac units can also cause an issue like this.
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Re: 1975 270 Disc Brake pressure not releasing

Unread postby Acesneights on Wed Oct 12, 2016 6:03 pm

diskman wrote:Vacuum boosters. PO replaced them about 10 years ago.. Is there a test I can do? Or just throw $$$ at it? :p

10 years they could easily be shot. Non use ruins them more than use.
Can you replicate the brakes locking up ?
If the brakes lock up try opening the bleeder at the hydrovac and see if it releases. If no then possible hose. If yes, most likely hydrovac. Also if opening the bleeder on the hydrovac does release the brakes then try the test one more time but loosen a line at the master although I would doubt it's proportioning valve.
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Re: 1975 270 Disc Brake pressure not releasing

Unread postby diskman on Sat Nov 05, 2016 5:40 pm

Ok! It was the brake pedal not returning all the way. I noticed a few times when getting gas that my brake lights were on until I pulled the pedal up.

Took her out for a drive today and felt the fronts grabbing again. I pulled the pedal up about 2 inches and felt them release. Whew.

lubed and greased the whole assembly underneath and it really freed up nicely! Now I don't have brake lights anymore.. Another project.

posted from my phone so may be typos. Lol.
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Re: 1975 270 Disc Brake pressure not releasing

Unread postby KB2CRK on Sat Nov 05, 2016 6:58 pm

Is the spring attached to the arm?

Image

The pedal return spring is in the left lower section of the picture.
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