The Most Comprehensive Free Online Reference for Packard Owners
Happy 4th of July! Become a member of Packard Motor Car Information, right now! (it's free)
Login
Username:

Password:

remember me

Lost Password?

Register now!
FAQ's
Main Menu
Recent Forum Topics
Who's Online
29 user(s) are online (25 user(s) are browsing Packard Forums)

Members: 2
Guests: 27

Wesley Boyer, kevinpackard, more...





57 Clipper - Break Issue
Home away from home
Joined:
2018/10/28 16:42
From Bruce, MI
Posts: 146
Any thoughts on why my brakes would fade to the floor?

The prior owner removed the booster from the circuit...


I rebuilt the master, booster and bled each line. I worked great for several weeks and now the pedal will go to the floor. No brake fluid at any of the connection points and fluid has not been topped off since I rebuilt them.

I am going to re-bleed the lines again (to make triple sure there is no air in the lines) but I thought I would ask to make sure I am not chasing a ghost.

Posted on: 5/31 17:15:20
Transfer the post to other applications Transfer


Re: 57 Clipper - Break Issue
Forum Ambassador
Joined:
2007/4/20 17:54
From Fresno CA
Posts: 15737
Any chance the system or cylinders were cleaned with an incompatible cleaner that has deteriorated a rubber seal somewhere or water or some other contaminant has gotten into the brake fluid and is gassing and able to be compressed when the fluid temperature increases. As I recall, the brakes with the Hydrovac power unit need to be bled in stages and power unit done in a specific sequence. Any chance something was amiss in the bleeding?

Posted on: 5/31 17:46:07
_________________
Howard
Transfer the post to other applications Transfer


Re: 57 Clipper - Break Issue
Home away from home
Joined:
2018/10/28 16:42
From Bruce, MI
Posts: 146
What appears to be happening is that after the 1st push of the break pedal, the fluid drains backward into the fluid reservoir. Evidently that is why the break booster was bypassed--- I'm putting a 2lb residual valve in the system to stop the drain back.

Any issues by doing that?

Posted on: 6/13 9:13:01
Transfer the post to other applications Transfer


Re: 57 Clipper - Break Issue
Forum Ambassador
Joined:
2007/4/20 17:54
From Fresno CA
Posts: 15737
There should be a residual (check) valve at the end of the master to prevent fluid draining back into the reservoir. When the brakes are applied the master cylinder piston moves a control piston in the booster to start the vacuum assist. The fluid from the master is also passed into the slave cylinder and brake lines to provide initial brake action. As the vacuum starts moving the power piston to apply more power another check valve in the power piston is supposed to trap the fluid in the slave cylinder so the vacuum assist is providing the power. Perhaps one or both of the valves are not working.

No idea of the specs for the master cylinder residual valve but probably 2-5psi. An external residual valve in the line between the master and booster might do the job if the master valve has failed or is missing. I would be careful to keep the valve at a low value so as not to provide so much valve resistance fluid could not easily return to the master and reservoir via spring pressure from the wheels when brakes are released. If not enough fluid is returned brakes would be a candidate for locking up or being extremely sensitive as they were repeatedly applied, each time adding more fluid and filling lines and wheel cylinders.

Here are a couple of scans from the 56 Stude manual. Your 57 Clipper was a facelifted 56 President model so brakes should be the same as the Stude manual details.

Attach file:



jpg  master.jpg (94.46 KB)
209_5ee50c2f9463f.jpg 706X611 px

jpg  power.jpg (473.97 KB)
209_5ee50c3cea986.jpg 802X1799 px

Posted on: 6/13 10:28:03
_________________
Howard
Transfer the post to other applications Transfer


Re: 57 Clipper - Break Issue
Home away from home
Joined:
2018/10/28 16:42
From Bruce, MI
Posts: 146
Excellent. That is great. I will try that!

Posted on: 6/13 12:25:25
Transfer the post to other applications Transfer


Re: 57 Clipper - Break Issue
Home away from home
Joined:
2007/6/28 6:24
From South Hills Pittsburgh Pa
Posts: 454
There is complete manual for 56 Studebaker and 57 Clipper supplement here on Packard info

Posted on: 6/13 13:58:36
Transfer the post to other applications Transfer







[Advanced Search]


Search
Recent Photos
July 4th 2020 Parade Packard (2020/7/4)
July 4th 2020 Parade Packard
1947 packard (2020/7/2)
1947 packard
no title (2020/7/1)
no title
DSC05939.JPG (2020/6/27)
DSC05939.JPG
Anton Kneer (2020/6/13)
Anton Kneer
Random Photo
1956 Clipper Custom
Helping Out
PackardInfo is supported and funded by user donations. If you would to help out by either donating content, or funds to help with the upkeep and hosting of this site please EMAIL ME or click on the donate button.