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Username Post: Master Cylinder Replacement        (Topic#352392)
eplantage 
Frequent Contributor
Posts: 2119

Loc: Southern MN
Reg: 03-15-04
08-08-18 09:53 AM - Post#2742339    

I'm finally going through the brakes on my '50 sedan delivery. The wheel cylinders were not functioning. I'm replacing those and I'm probably going to replace the master cylinder as well. The '49-52 had a 1" bore and the '53-54 a 7/8" bore. Would it make that much of a difference if I went with the 7/8" bore? The car does have the Bendix brakes from the '51 that gave up it's frame.I imagine the 7/8" bore would provide greater brake line pressure with less effort. Thanks.

Age: 64 at the moment
1950 Chevrolet Sedan Delivery
1953 BelAir Convertible Project
2002 Heritage Springer FLSTSI
1930 Model A Standard Coupe


 

Chevs of the 40s

raycow 
Honored Member
Posts: 27789
raycow
Loc: San Francisco, CA
Reg: 11-26-02
08-08-18 10:33 AM - Post#2742342    
    In response to eplantage

The 7/8" bore will noticeably reduce the pedal effort required to stop the car. You won't get this benefit for free, however. The price you pay is increased pedal travel.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
Keith_Knox 
Moderator and "16th Year" Gold Supporting Member
Posts: 5983
Keith_Knox
Age: 77
Loc: Napa, Ca USA
Reg: 04-02-00
08-08-18 07:24 PM - Post#2742400    
    In response to eplantage

I think I would go with a duel master cylinder if you are going to change it out.

29-41, 42-48, 49-54 Moderator
1948 Chevy Fleetmaster Coupe Purchased 6/2010. Stock with rebuilt 52 216 installed May 1966.
1946 Chevy 1/2 ton pickup, stock. Purchased 11/18/17.
1962 Ranchero Purchased 4/2017 221 V8 Auto. Sold 9/20/18
2013 F150


 
2blu52 
"17th Year" Silver Supporting Member
Posts: 18588
2blu52
Age: 85
Loc: Montana
Reg: 03-12-02
08-09-18 07:48 AM - Post#2742461    
    In response to Keith_Knox

  • Keith_Knox Said:
I think I would go with a duel master cylinder if you are going to change it out.


That would remove part of the anticipation of driving an old car. Nothing much more exciting that to hit the brake pedal and have it travel to the floor. Might add a little traffic or a good down hill stretch of road to that.


"PEACE IS THAT GLORIUS MOMENT IN HISTORY WHEN EVERY ONE STANDS AROUND RELOADING"

THOMAS JEFFERSON


 
raycow 
Honored Member
Posts: 27789
raycow
Loc: San Francisco, CA
Reg: 11-26-02
08-09-18 09:01 AM - Post#2742471    
    In response to 2blu52

I have experienced that "excitement" twice in my life, due to a hose failure in both cases. The first time was before dual chamber masters existed as a regular production item. The second time was after, and that one made a believer out of me. Now, all of my projects get a dual MC before they go out on the street.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
2blu52 
"17th Year" Silver Supporting Member
Posts: 18588
2blu52
Age: 85
Loc: Montana
Reg: 03-12-02
08-09-18 02:00 PM - Post#2742512    
    In response to raycow

Coming home fro a week fly fishing with a friend we topped McDonald Pass at 6,000 feet, at that time a twisty two lane road. Less than 100 miles later I stepped on the brakes on my 74 Dodge 4X4 and blew the left front brake line. Dual master cylinders saved the day. It was the second time that particular hose had failed.

"PEACE IS THAT GLORIUS MOMENT IN HISTORY WHEN EVERY ONE STANDS AROUND RELOADING"

THOMAS JEFFERSON


 
Bel Air kiwi 
"3rd Year" Silver Supporting Member
Posts: 4374
Bel Air kiwi
Loc: New Zealand
Reg: 04-24-14
08-09-18 03:08 PM - Post#2742519    
    In response to 2blu52

Hi Guys, Bendix brakes were offered first with the 1" bore master and then later the 7/8" with the wheel cylinders remaining the same. vehicles were otherwise quite similar

However what I can't confirm is if the pedal levering ratio was the same for both. If 53-4 had the same pedal assembly by part number as the earlies that would confirm this.

Otherwise, normally pedal travel v feel is a combination of bore size/wheel cylinder size/ and pedal ratio. Change any of these and it changes the outcome. There is no free lunch here, gain one loose somewhere else.

I too have had a total loss of brakes due to a rear axle "C" clip failure. Brakes were in mint condition but totally failed due to lack of a brake drum.

I am very comfortable that none of my classics with good stock brakes stops as well as most modern cars, and that is the traffic I have to drive in.

My choice would be to go dual-master, if it wasn't a museum car.
All sizes are available. Remeber if its underfloor it needs RLP valves like the single had.

If I was staying drum/drum, either Bendix or Huck, I would sneak a small booster underfloor. The little ones don't do a lot but they do add a positive increase in line pressure which can increase stopping power and/or reduce the pedal pressure required in normal driving. Normally these little boosters will give a ratio of about 1.3:1 which is good for drums.


Cheers Kiwi

48 3100 RHD, 51 Deluxe 4DR RHD, 51 Bel Air parts car, 52 Bel Air P-Glide LHD. Others 23T, 32 Tudor, 58 Edsel pacer 4DR HDT, 79 F250 351C RHD. 69,70,82 Capri. No mobile, no TV, and no Jap cars.

"They made a desert and called it peace." Tacitus


 
Gene_Schneider 
Ultra Senior Member
Posts: 12169

Loc: Wisconsin..USA
Reg: 09-27-02
08-10-18 07:48 PM - Post#2742664    
    In response to Bel Air kiwi

I installed the 7/8" M/cyl on my 1950. Brakes require a little less pressure but pedal travel (with the same adjustment) is a bit farther. nothing I can not live with.

ChevGene 1934 Master sedan 1939 Master DeLuxe Town Sedan 1950 Styline DeLuxe Power Glide 1957 Nomad 283 PG 1963 Corvair Convertible


 

Chevs of the 40s

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