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bad master cylinder
#1376847 Sat Sep 12 2020 10:56 PM
Joined: Jun 2007
Posts: 33
gmman4 Offline OP
Wrench Fetcher
i have a 1955 ist series 3100 p/u. it was restored in 2001. bone stock. when driving the truck, to stop or slow down, i have to push the brake pedal hard. there is no grinding. is this a sign of a master cylinder going bad? if the master cylinder is bad, should i replace it with a dual master cylinder? thanks in advance, jim

Re: bad master cylinder
gmman4 #1376849 Sat Sep 12 2020 11:06 PM
Joined: Sep 2001
Posts: 30,478
ace skiver
What procedures do you use to bleed and to adjust the brakes?

Tim []
1954 3106 Carryall Suburban [] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. []
Re: bad master cylinder
gmman4 #1376850 Sat Sep 12 2020 11:10 PM
Joined: Feb 2004
Posts: 21,052
How many wheels are actually trying to stop? It sounds like you've got a couple of wheel cylinders corroded or gummed up, or maybe some collapsed flex lines that are keeping some of the brakes from working. Jack up wheels one at a time and see if you can turn the wheel while a helper applies the brake. Unless it's a daily driver, a lot of oddball stuff can happen to a brake system in 19 years.


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Re: bad master cylinder
gmman4 #1376857 Sun Sep 13 2020 12:37 AM
Joined: Jan 2001
Posts: 5,024
Master Gabster
A lot of the time this problem is a result of the drums being turned oversize and the shoes not being arced to match.

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Re: bad master cylinder
gmman4 #1376930 Sun Sep 13 2020 08:58 PM
Joined: Dec 2014
Posts: 691
Shop Shark
Possibly glazed shoes and drums from excessive heat at some time in its life.

Another possibility is grease or oil contamination on the shoes.

Don't randomly replace parts without first ascertaining what the actual problem is.

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Re: bad master cylinder
gmman4 #1378628 Sun Sep 27 2020 02:44 AM
Joined: Sep 2020
Posts: 1
i too have master cylinder problems on my chevy c60 truck. i have not found a replacement for it as it is 2 different sizes the clutch is 1 1/8 " but the brake is 1 1/4 i can fine dual 1 1/8 and dual 1 1/4 but not the 2 together does any one know if i go with one of the single sizes will it be a problem one way or the other will the 1 1/4 overwelm the clutch or will the 1 1/8 not be enough for the brakes ???

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