gustycrosswinds Posted May 3, 2021 Share Posted May 3, 2021 Greetings. I am looking to replace my master cylinder. I do most of my shopping on rock auto and they have categorized some of the cylinders based on the rear disc or drum brake. What is going to be the difference of the cylinders if they both will feed either a wheel cylinder or caliper? I will probably go with BECK/ARNLEY 0729761 but that is one of the few that doesn't specify the rear brakes. I have rear drum brakes. Any insight? Thanks! Link to comment Share on other sites More sharing options...
Slartibartfast Posted May 3, 2021 Share Posted May 3, 2021 The difference is the proportioning valve built into the brake master. The prop valve limits pressure to the rear brakes. Disks need more pressure than drums to work properly, so a disk master may feed more pressure to your rear drums than they need, which could lead to them locking up under hard braking. 1 Link to comment Share on other sites More sharing options...
gustycrosswinds Posted May 6, 2021 Author Share Posted May 6, 2021 AH I see. Thank you for that explanation Link to comment Share on other sites More sharing options...
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