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#1455816 Tue Jun 21 2022 10:34 AM
Joined: Sep 2010
Posts: 1,408
K
'Bolter
What master cylinder do you use to upgrade a stock 54 gmc with drum brakes. All the imfo I find seems to be for upgrades with dscs on the front .I was thinking a 1967 chev truck master cylinder .Also with drums all around is a proportioning valve required.Thanks Kevin


kevinski 1954 GMC 9300 Welcome to the virtual Garage [stovebolt.com]
KEVINSKI #1455829 Tue Jun 21 2022 12:31 PM
Joined: Mar 2014
Posts: 3,004
J
'Bolter
I can't tell you about the master cylinder. As for the proportioning valve, I've never used one on my 1952 and I still have drum brakes. I considered one back when these valves were getting popular, but a friend who ran a chain of brake repair shops told me not to worry unless I was having trouble and if that was the case to let him see what it needed. He went on to explain the valve wouldn't have been there as it came along after 1952 but unless I was having trouble with rear wheels locking up the system designed by GM would be just fine without anyone trying to re-design it. I've never noticed the rear wheels breaking loose, but I could always see that they might have that tendency. He did also say the rear tires in any pickup should always have good tread and should be kept inflated to the right pressure.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
KEVINSKI #1455838 Tue Jun 21 2022 01:47 PM
Joined: Oct 2021
Posts: 521
O
'Bolter
I don't know that I'd classify a conversion to disc brakes as an upgrade. Properly adjusted drums provide more than adequate stopping power. In many cases stopping distance will increase with the use of discs. That's one reason dump trucks and semis use drums all around.

The only advantage discs have over drums is that they don't overheat under repeated hard braking. I doubt your truck will be subjected to such abuse unless you're auto-crossing it.

Last edited by Otto Skorzeny; Tue Jun 21 2022 01:48 PM.

1939 Packard Standard Eight Coupe
1950 Chevrolet 3100
1956 Cadillac Coupe de Ville
1966 Oldsmobile Toronado
1966 Ford Mustang
1964 Ford Galaxie 500 coupe
1979 Ford F-100
1976 Ford F-150
1995 Ford F-150
KEVINSKI #1455847 Tue Jun 21 2022 03:39 PM
Joined: Sep 2010
Posts: 1,408
K
'Bolter
Not wanting discs just wanting to upgrade the master cylinder .wondering what is used for a master was thinking a 67 truck with drums all around to replace the single master cylinder .


kevinski 1954 GMC 9300 Welcome to the virtual Garage [stovebolt.com]
KEVINSKI #1455851 Tue Jun 21 2022 04:06 PM
Joined: Mar 2010
Posts: 1,382
B
Curmudgeon


"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
KEVINSKI #1455862 Tue Jun 21 2022 04:47 PM
Joined: Oct 2021
Posts: 521
O
'Bolter
Originally Posted by KEVINSKI
Not wanting discs just wanting to upgrade the master cylinder .wondering what is used for a master was thinking a 67 truck with drums all around to replace the single master cylinder .

Aahh... I skim read your post and thought you were doing discs. Sorry.


1939 Packard Standard Eight Coupe
1950 Chevrolet 3100
1956 Cadillac Coupe de Ville
1966 Oldsmobile Toronado
1966 Ford Mustang
1964 Ford Galaxie 500 coupe
1979 Ford F-100
1976 Ford F-150
1995 Ford F-150
KEVINSKI #1455889 Tue Jun 21 2022 09:39 PM
Joined: Sep 2010
Posts: 1,408
K
'Bolter
Thanks buoymaker that helps


kevinski 1954 GMC 9300 Welcome to the virtual Garage [stovebolt.com]

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