Project is stalled. Cannot solve brake problem

[Peter coppola]

So regarding the firewall, I have the power brake bracket on the firewall. I am checking the push rod tomorrow when the checking tool arrives. I will send photos. I change combo valve already once as another buddy told me his issue with the combo valve. I will see if depressing the combo pin while bleeding. I can make a tools from some small square stock.

 

[Peter coppola]

Thank you for sketch. Will work on that bracket as well.

 

[Peter coppola]

OK, got home late from work and its cold in the barn. Won't have time to rig up a pedal bracket as recommended till the weekend as I am working late next two nights and Friday date night with wife.

I did three simple things as follows:

1. I got the push rod checking tool from Amazon today. Cost $12 bucks delivered. I unbolted the master and confirmed the push rod and the master are good. About .020 gap as stated. The rod on the booster is not adjustable in any case.

2. I removed the rear brake line and plugged rear master port. Started truck - pedal to floor.

3. I swapped lines and plugged front master port. Started truck - excellent pedal.

4. I removed both lines and plugged both master ports. Started truck - rock hard pedal.

I think therefore the master is good.

Above took me all of 10 minutes after dinner.

Any thoughts?

 

[WatfordJohn]

Sidebar as to not detract from all the master cylinder/booster talk: Do your front brake lines match the size of your banjo? (10mm vs. 7/16")

 

[Peter coppola]

using ac delco front lines, new copper washers and new callipers, the bolt fits snugly in the line banjo and I have no leaks. No air comes out on pressure bleed or vacuum bleed.

 

[Ricko1966]

Have you checked pedal pushrod clearance? There should be practically non you shoukd just barely feel it when you move the pedal with your hand you may even have to touch the pushrod it's self while moving the pedal,to feel the clearance.