 17mm vs 19mm master brake cylinder, pros and cons? |
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| 914 RZ-1 |
 Mar 12 2023, 05:33 PM
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Porsche Padawan  Group: Members Posts: 684 Joined: 17-December 14 From: Santa Clarita, CA Member No.: 18,230 Region Association: Southern California  |
I need a new M/C. Stock is 17mm, but it seems everyone is selling 19mm. I'll get a firmer pedal and less stroke with the 19mm, correct? Is this good or bad or personal preference?
What are the advantages/disadvantages of both? Thanks! -Jeff ----------- |
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| bkrantz |
Mar 13 2023, 08:38 PM
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914 Guru Group: Members Posts: 8,422 Joined: 3-August 19 From: SW Colorado Member No.: 23,343 Region Association: Rocky Mountains 
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At the risk of high-jacking (sorry) what can be done to maximize braking power (real and perception) with the stock system?
As part of my build, I completely overhauled the brakes, with 4 calipers and rear pressure valve rebuilt by PMB, all new lines and hoses, new Porterfield pads, new disks, and a new ATE 19mm MC. I did lots (LOTS! of bleeding) and had a very firm pedal. And I carefully did the bedding procedure that PMB recommends. But the brake power always seemed lacking. I could get one or both front wheels to lock up (barely) if I really stood on the pedal. @Eric_Shea , and others, any comments? |
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Posts in this topic
914 RZ-1 17mm vs 19mm master brake cylinder Mar 12 2023, 05:33 PM
JeffBowlsby
I need a new M/C. Stock is 17mm, but it seems eve... Mar 12 2023, 05:39 PM mepstein 19mm - moves more fluid, less pedal travel. Needs ... Mar 12 2023, 05:42 PM
914 RZ-1
19mm - moves more fluid, less pedal travel. Needs... Mar 12 2023, 07:45 PM Superhawk996
I need a new M/C. Stock is 17mm, but it seems eve... Mar 12 2023, 05:54 PM 914 RZ-1
[quote name='914 RZ-1' post='3064607' date='... Mar 12 2023, 07:50 PM 914werke
19mm - moves more fluid, less pedal travel. Needs... Mar 12 2023, 05:58 PM mepstein Make sure you replace all your soft rubber lines i... Mar 12 2023, 06:15 PM 914 RZ-1
Make sure you replace all your soft rubber lines ... Mar 12 2023, 07:44 PM 914Toy It also depends on which calipers you are using.
... Mar 12 2023, 07:26 PM 914 RZ-1
It also depends on which calipers you are using. ... Mar 12 2023, 07:47 PM 914 RZ-1 Thanks for the replies! I did search this site... Mar 12 2023, 07:43 PM Superhawk996 17mm m/c are indeed hard to come by. NOS pops up ... Mar 12 2023, 08:06 PM 76-914 I installed one of Mark's 19mm when the 17mm w... Mar 12 2023, 08:24 PM Cairo94507 Just because, I have a 23mm master cylinder, 914-6... Mar 13 2023, 08:03 AM mepstein PMB sells Porterfield brake pads. I’ve been real... Mar 13 2023, 08:52 AM Eric_Shea In a "real world" application, the feel ... Mar 13 2023, 01:22 PM mgp4591
In a "real world" application, the feel... Mar 14 2023, 07:07 AM Eric_Shea
At the risk of high-jacking (sorry) what can be d... Mar 14 2023, 10:28 AM bkrantz
At the risk of high-jacking (sorry) what can be ... Mar 14 2023, 08:01 PM 76-914 IMHO, I try to avoid locking up the brakes. You ca... Mar 13 2023, 10:30 PM bkrantz
IMHO, I try to avoid locking up the brakes. You c... Mar 14 2023, 07:59 PM Superhawk996 :agree:
People have become used to overboosted b... Mar 14 2023, 05:55 PM bkrantz
:agree:
People have become used to overboosted ... Mar 14 2023, 08:05 PM 930cabman
:agree:
People have become used to overboosted ... Mar 16 2023, 06:23 AM 914werke In a "real world" application, the feel... Mar 16 2023, 12:08 PM |
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