Disc brake swap problem

[cantflip]

Working on an edit

 

[cantflip]

Thank you for your help. I actually only used water to wash out MC ,after thinking about it, and scraped the rust and muck with a wire brush. I repeated this several times then blew it dry with compressed air. Sorry I said parts cleaner in initial post but that was incorrect as I had just run out of it on a previous project. I still think it sounds like MC need inspection and will start there. I appreciate all help and take no offense to anyone's input. This is not what I found for a living but I enjoy working on these old cars... I am apparently just not very good at it

Don't worry... everyone has those days.

Could also be the rear rubber brake line is damaged and is creating a check valve situation. I have had this happen to me on a new rubber brake line that was less then a year old.

This is correct, it could be in the rear brake hose. If it is torn internally this can happen... pretty common actually.

Also look in the master while someone moves the pedal... be cautious so it doesn't squirt everywhere... look for turbulence at both front and rear chambers from the compensating ports (little holes at the floor of the reservoir)... If no turbulence, your push rod is adjusted to far forward.

 

[pmschmitt]

Ok will do! After work tommorrow I will start to sort this sucker out...... To be continued

 

[cantflip]

Ok will do! After work tommorrow I will start to sort this sucker out...... To be continued

Cool. I neglected to give diagnostic instructions for the brake hose... in case they help. Simple really, you hold pressure at the wheel cylinders as you discovered opening the bleeder. Crack the line loose where its attached to the hose... if you don"t hold pressure before the hose and do at the bleeder... has to be the hose. Sorry, don't know where my head is sometimes...

 

[pmschmitt]

Ok got new MC for 69 model ( larger bore than current one so less pressure ). Also looked at flexible line and it was garbage. Lots of debri had built up over the years and I was unable to blow through it. So gonna go ahead and swap it out also while we are neck deep in this project.

 

[pmschmitt]

Huge shout out to all helped me in trouble shooting this project! This forum is very helpful.

I got the new MC and brake booster in, replaced the flexible hydraulic line to the rear diff. bled brakes, adjusted rear brakes and then bedded them in as described in this forum and the improvement over drums is amazing. Well worth the busted knuckles and four letter words. You really can't appreciate the difference until you are really using the brakes and heat them up. Brake fade is a thing of the past.

I'll send some more pics soon.

 

[pmschmitt]

Update on disc brake conversion.... All is well with the upgrade. Just got the car aligned and now she is cruising straight as an arrow ( front end rebuild). Also new mc and power booster work great. I didn't like how far I was having to push the brake down until I got stopping power, but an adjustment of the push rod solved the problem. Again thanks to this forum.

 

[live4theking]

It isn't any fun when you don't have confidence in your brakes. Happy cruising.