Bleeding Master Cylinders for Budd Brakes

[bajajoaquin]

All the info below is related to the 1967 Imperial and Chrysler FSM. I got my master cylinder from PST last weekend, and I'm hoping to put it on this weekend. A couple of things:

1) Previously, I hadn't seen the separate trouble-shooting section in the Budd brakes part of "Brakes." I only saw the one in the front of the chapter. One of the symptoms is "Front Brakes Heat up During Driving and Fail to Release."

One possible cause is Residual pressure valve in master cylinder.

The fix says, "Remove valve. (See Fig. 15)." Unfortunately there is no Fig. 15. I've bought the MC, so I'm not likely to return it, but... anyone have an idea here? Note that this is on 5-29. It's possible that it's a typo, and they're referring to Fig 3 on 5-36, but that doesn't really solve the issue.

2) (and this is really getting to the point) On P 5-37, under "Bleeding the Master Cylinder," the instruction reads, "Clamp master cylinder in a vice and attach bleeding tubes Tool C-4029 (Fig 7). Be sure that a residual pressure valve is on end of tube in large capacity resivoir. (This keeps brake fluid from being syphoned out of reservoir during bleeding operation.)"

Huh? If the tubes go to a level lower than the brake fluid, how would it siphon out (never mind their odd spelling of "siphon").

Anything to this? Anything to be worried about, or just go ahead and make my bleeding tubes and get on with it?

Pic grabbed from manual for reference.

 

[bluefury361]

All the info below is related to the 1967 Imperial and Chrysler FSM. I got my master cylinder from PST last weekend, and I'm hoping to put it on this weekend. A couple of things:

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View attachment 28892

The set up shown in the diagram should work fine. I would block off the forward outlet and bleed the rear first, then go on to the forward outlet.

 

[bajajoaquin]

Thanks. Where do I get a residual pressure valve? All the discussion I've seen of bench bleeding is a simple bent brake line that routes back into the reservoir. Is it a necessary part?

 

[commando1]

I think they're referring to a check valve.
I just use a flexible tube and pull it back out when returning the stroke.
Stick it back in when I depress it again,
Repeat.


I think....

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[bluefury361]

Most parts stores will have a universal bleeder kit. It has different plastic fittings and clear flexable hoses ..... It's all you need

 

[70bigblockdodge]

There are residual pressure valves in m/c for drum brakes. I would doubt very much in this day and age that a disc/drum master cylinder would be built / rebuilt with them on the disc side would not concern yourself with it. Use the kit Will is talking about and just bleed away till no more bubbles, the residual valves keep a little pressure in wheel cylinders to help brake pedal feel and height, on any disc brakes it would.make them drag as there are no springs to pull back/ release brakes like drum brakes.