disc brake help on 70rr

[TRAMO]

ok guys need a little brake help.my right front caliper will stick after the brakes are depressed 4 or 5 times. but will unstick when i open the bleeder.i replaced the brake hoses didnt help .i replace the right caliper and still didnt help. even the left caliper gets very tight but does not stick completly. the 70 manual says the residual pressure valve inthe master cyl might be the problem, but the illustrations show the residual valve controls the rear brakes. any help appreciated.also the front calipers are off 73 duster.

 

[bm02tj]

Try cracking the brake line at the master and if the brake releases you have a master problem or an adjustment problem

 

[Brads70]

pushrod too long?

 

[67 coronet]

well,its either the prop valve or the master at this point.bm02tj is right and that should tell you wich to change.

 

[AMX364]

Or try loosing the nuts mounting the MC to booster, if pushrod is too long. If releases then will need to grind some length off pushrod. With clean brake fluid should see the MC piston move with strong flashlight in bore. Do not want it to move till press brake pedal. Also check for misadjusted brake light switch, if really bad adjusted might be holding it in.

 

[TRAMO]

Replaced mc and fixed

 

[SureGrip]

Glad to hear that fixed the issue.

I just found these old service videos on line...this one does a great job of explaining the single-piston braking system.

http://www.youtube.com/watch?v=Kgnf28SLz_4

http://www.youtube.com/watch?v=Tuuv6xyq9Ns