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Jul 21st, 2025 | | | | Joined: Sep 2003 Posts: 151 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2003 Posts: 151 | Luckly it was just pulling out of the garage. I don't know and can't figure out what has happened. It is an aftermarket booster,master cylinder and pedal assembly and they have worked for the past year and a half fine.
Here's my check list:
fuild- fine
leaks- none
booster- holding vacum
bleed master cylinder- done, fuild moves, no air
pedal goes to floor, no brakes- yes right away!!!!
This is a disc/drum set-up so I have the proporitioning valve in place.(could have gone bad, it is a used one??)
Any ideas please feel free to help me out on this one.
Thanks
David
Just a firefighter,
Cleverly disguised as a responsible adult
'46 1/2 T Panel
| | | | | Joined: Apr 2005 Posts: 2,066 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,066 | The proportioning valve should have shut off the flow to the front or rear depending on where the failure is so you should not loose everything. I have not seen a proportioning valve cause a total loss of braking. I would suspect an internal failure in the master cylinder. You said you were able to get pressure out of it but I would take a closer look at it.
Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
| | | | | Joined: Oct 2006 Posts: 4,983 Master Gabster | | Master Gabster Joined: Oct 2006 Posts: 4,983 | If it is an after market MC I would think it must have two cylinders. It is scary to think something would cause everything to quit and leave you with no pedal. That would change the term "parking brake" to EMERGENCY BRAKE". 
~Jim
| | | | | Joined: Feb 2000 Posts: 769 Shop Shark | | Shop Shark Joined: Feb 2000 Posts: 769 | It sounds like the MC is bypassing fluid before enough pressure is reached to activate the brakes. The whole idea of a dual system is so there is not a catastrophic loss of brakes. Have you tried plugging the MC ports to see if you have a hard pedal? | | | | | Joined: Sep 2003 Posts: 151 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2003 Posts: 151 | Thanks guys for the help but I think I get the "DUH" award for the week. I forgot about one thing I did. I wanted to raise the pedal off the floor alittle more so I unscrewed the rod under the dash about 15 turns or so. Well what I did was pull it away from the booster diaphragm and thus no brakes at all. The rod was not reaching the MC enough to apply the brakes just enough to bleed it to appear that it was working alright. I fixed the rod and got it longer and where I want it and now have plenty of brakes. Even took my daughter out for a ride tonite
Thanks again
David
Just a firefighter,
Cleverly disguised as a responsible adult
'46 1/2 T Panel
| | | | | Joined: Sep 2007 Posts: 2,644 Shop Shark | | Shop Shark Joined: Sep 2007 Posts: 2,644 | Thanks guys for the help but I think I get the "DUH" award for the week. The Official DUH AWARD Committee has accepted your nomination and you will be receiving your award in the mail shortly. Congratulations. | | | | | Joined: Sep 2006 Posts: 206 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2006 Posts: 206 | Sound's similar to what I did but with the motor.Had 4/8 plug wires reversed.tried for an hour to figure out what happend.my btother show's up (who is NOT a mechanic at all)or so I thought.Found the problem in less than a minute!GRRRRR | | | | | Joined: Oct 2006 Posts: 4,983 Master Gabster | | Master Gabster Joined: Oct 2006 Posts: 4,983 | We've all been there! 
~Jim
| | | | | Joined: May 2004 Posts: 150 Wrench Fetcher | | Wrench Fetcher Joined: May 2004 Posts: 150 | Czechman, your reply made me laugh out loud...scared the cat. | | |
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