This looks like a smart innovation, has anyone tried it?

Cardone advocates using a syringe , pushing brake fluid down into the empty master cylinder ..... then with the syringe pushing it in "reverse" from the output on the MS backward, bubbles of air coming up through the reservoir. This looks like it makes a lot of sense.

https://www.youtube.com/watch?v=USdtwqju4GY

Do you have to bleed dual rear (of the master cylinder) outputs simultaneously or one then the other?

Sixto
83 300SD

Looks cumbersome. I never bench-bleed on the bench. I install the MC on the car and use the pedal to bleed, w/ tubes looped from the ports back to the reservoir. Cheap plastic tubes often come w/ a rebuilt MC. Usually takes at least 50 pumps before you see no more bubbles. Some of my newer cars might be the "stepped bore" mentioned since look similar to the youtube.

__________________
1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

I like the reverse direction of BF flow those bubbles want to go UP

I stopped seeing air after 5 cycles .... should I trust that? Several cycles after that, no bubbles, with waiting in between.

I bench bled it unskillfully before installing

now am doing it in the car , pushing the brake pedal with a piece of 2 x 4 with good view of tubes into the reservoir

I totally changed all the fluid ie bled all four calipers maybe three times got some air each time and still have a mushy pedal

also changed all the brake hoses

rebuilt the rear calipers

new metelli master cylinder

wtf wtf wtf

I don't know what car you have. In mine, the rear 2 lines bleed quickly that way. Once bled, I capped those lines and bled the front line which takes forever.

Sixto
83 300SD

mine is 84 300TD

couldn't be any different.

front fluid output goes to the two rear wheels

the rear two outlets on the MS each go direct to a front wheel

do you get just a few tiny bubbles when working the front only

and you just keep at it until you get not even occasional tiny ones?

little bits, then an occasional larger one, then nothingh, then little bits

There must be a better way

In my case and bleeding in the car, the front wouldn't bleed completely until I capped the rear 2 ports. If you're in the same situation, try bleeding just the forward cylinder section with the rears plumbed to the wheels. That might give enough resistance to bleed the forward section more completely.

Sixto
83 300SD

well I don't which is or is not
I am getting bubbles from the rear pair feeding front wheels

The front line (real wheels) is simply normally connected.

when the front wheels (rear pair of connects tothe MS) finally get free of bubbles I'll cap them and repeat with the

you weren't kiddin

its a grind

Im into trying the syringe

this is no fun

sf bay area too Los altos

you're the one with experience

I in the pain of learning by screwing it up phaze

I meant does the syringe thingy work when a master cylinder piston serves two lines.

Sixto
83 300SD

don't know, anything that ejects bubble quickly would be good

never had the MS apart, I suspect both front wheels share fluid output from a single chamber through the two openings, and the same piston,

You don't really meant that right.... cumbersome?

vs 50 strokes waiting each stroke keeping it depressed?

If the video from Cardone is not a complete fraud then its far quicker, more efficient.

Not sure what waiting is for. I just keep pressing the pedal slowly, watching the loop-back tubes. Doesn't normally take me 50 strokes, maybe 15 then a few more to insure no stray bubbles, but don't stop at a given count, just keep going until solid liquid.

Also, don't conclude "mushy pedal" after the first brake application. Drive the car around the block, braking repeatedly. If you changed pads and such, they need to seat and the caliper pistons need to find their home. With rear drum brakes (not my M-B), the pedal is really loose at first until you back up many times, jamming on the brakes to let the self-adjusters take up the slack.

__________________
1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

I put bolts, the same thread in MC output ports, M10 X 1, so they are blocked

the pedal still sinks right to the floor

Metelli master break cylinder

Bad master brake cylinders maybe aren't so uncommon .... especially low brow cheap ones

the piston syringe pushing B fluid backwards expells but gulps of air at once, all of it at once