More. Brake problems
 

Hyd brakes on my 35 R.D. ,,everything was bad so put 4 new WC and new MC ,flushed out lines ,adjusted lockhead brakes as per motor manual,using dot 4 fluid ,,bench bled MC ,,
Everything ready,,,I have no pedal at all,,,pump pump pump,no bubbles in in jar,, what’s wrong,?? Just keep pumping???

Re: More. Brake problems
 

did you bench bleed the master?

Re: More. Brake problems
 

As this is a non stock application, a few questions are in order.
What pedal setup do you have? Are you getting a decent stroke on the cylinder?
Is the pedal push rod set up so you get a minimum of wasted stroke before the piston closes off the recuperation port? Is the recup. port open at rest? Do you have a good return spring on the pedal?

I find it difficult to bleed by just pumping. I have used both pressure type bleeders and a vacuum system before now, and they both got the job done. The pressure type is better, though, just a little more finicky to set up.

Mart.

Re: More. Brake problems
 

System has been there for about 20 yrs and worked fine ,I think it was a complete 39 or 40 swap.pedals ,mount and all. Tried the vacuum pump,not much luck!might need to rig up a pressure setup or get neighbor to come over and use his leg while I try bleeders again!,

Re: More. Brake problems
 

make sure piston is not stuck at the end of it,s stroke. is it a foren make if yes it could be your problem

Re: More. Brake problems
 

It is a Dorman product,don’t know where it’s made but acts like it nots even pumping,pain to take out but will definitely check this,,,

Re: More. Brake problems
 

The system may have had a mc with a built in residual valve and the new one does not .

Re: More. Brake problems
 

What about the question in post #2?..... Mark

Re: More. Brake problems
 

Re-read the end of line 2 in the original post.;)





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Re: More. Brake problems
 

I’ve been doing this kind of work 64 years for a living.
Bench bled a master cylinder once.
Don’t see any reason to do it. Doesn’t hurt to do it just makes a not needed mess.
Why not chassis bleed it?
Anyway he said in the first post he bench bled it. If he bench bled it we know the cylinder is ok. Mounting it in the car did something. Must be no free play in the push rod.
Don needs to put some safety glasses on and look in the master cylinder to see if the piston is coming back far enough to see that it is uncovering the hole so the fluid can drop down into the bore when the pedal is back.

Re: More. Brake problems
 

Will check post 10 this morning,good idea!!

Re: More. Brake problems
 

What mess?? I stand on the other side of the street from you,and I don't see the mess.

Meanwhile we still haven't helped Don. I would guess that a real deal pressure bleeder should help after double checking the adjustment.

Re: More. Brake problems
 

Exactly.

Never bench bled anything at either place I worked either.
He could make his own power bleeder if he's got the same master he had originally and maybe has a spare cover. He could install a valve stem in the cover and put about 5 psi air above the brake fluid. That'll definitely push brake fluid through the system and out to the four corners.

Re: More. Brake problems
 

The pressure bleeders I have used that had a gage on them we used up to 20 psi. But 5 will do the job. You just run out of pressure sooner with 5.
A pressure bleeder won’t do him biddily if the push rod is holding the piston too far in.

Re: More. Brake problems
 

Removed Mc and looked at internals ,everything looked good,will make a better adjustment on rod when I reinstall!! Took a empty propane cyl and cut in half and made up a larger cup with old lid to hold a lot more brake fluid blead Mc on bench again ,surprisingly how much air was in there ,,will try again tomorrow,,,need to make up a pressure cup,if this don’t work!!like the valve core in cap but would empty Mc very quickly if muchair in lines,which I believe I have,,,

Re: More. Brake problems
 

Maybe you should consider installing a set of 'Speed Bleeders'.
Then you won't need a neighbor to pump the pedal.
They were the solution to a brake bleeding problem that I had.
https://www.fordbarn.com/forum/attac...3&d=1591968663

Re: More. Brake problems
 

as you discovered it can cause a lot of problems.I was not being smart when I asked about bleeding it.as you know there is bleeding and then there is bleeding.hopefully this allows you to be out and about now

Re: More. Brake problems
 

How do speed bleeders work? What do they do? Are they just a check valve?

Re: More. Brake problems
 

They are more than just a check valve, they have a substance applied to the thread to prevent sucking air on the pedal back stroke.

Re: More. Brake problems
 

Problem solved!! Finally got it all back togeather this morning ,plunger on Mc adjusted so toi let flluid in ,got neighbor out of bed to pump pedal,SLOWELY., went thru twice beeeding ,had a good hard pedal with a little room at top,,, but but looked under car!leak at banjo fitting ,I put to new washers in earlybut think the brass had a split,!friend supposed to bring me over a spare,,then start over, I think my problem was I wasn’t giving MC enough time to fill up !moving pedal to fast ,lot of good help here,thanks!!