 What size master cylinder should I use? |
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| tornik550 |
 Aug 26 2016, 05:20 PM
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#1
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Senior Member  Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None  |
What size master cylinder would be best for my setup? I have wide A calipers up front and 914/6 gt rears?
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| Steve |
Aug 26 2016, 05:23 PM
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#2
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914 Guru Group: Members Posts: 5,613 Joined: 14-June 03 From: Orange County, CA Member No.: 822 Region Association: Southern California 
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19mm
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| porschetub |
Aug 27 2016, 03:09 AM
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#3
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Advanced Member Group: Members Posts: 4,706 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
19mm I have huge calipers installed by PO and 19mm works,besides steve knows ,besides I hate working on brakes so its right first time everytime.
Done a lot of work with VW Golf brake upgrades and never run any thing much bigger than stock,might be me but hear of people going to 23mm (IMG:style_emoticons/default/WTF.gif) |
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| falcor75 |
Aug 27 2016, 03:29 AM
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#4
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Senior Member Group: Members Posts: 1,579 Joined: 22-November 12 From: Sweden Member No.: 15,176 Region Association: Scandinavia
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I have the Brembo AM calipers front and stock ones in the rear combined with the 19 mm MC. I feel the pedal throw is a little long before the brakes really kick in...maybe its something one gets used to? (my pads need bedding in too but but that car isnt road legal yet)
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| Krieger |
Aug 27 2016, 08:32 AM
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#5
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Advanced Member Group: Members Posts: 4,727 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None
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I cannot remember for sure what the wide A was. If it is from the Carrera 84-89 I have the identicle set up front and rear. I selected the 19mm master based on a discussion with Eric Shea. Basically the front and rear pistons diameters are the same as porsche intended so you have the same front to rear bias. The results are nothing short of amazing. Stopping power is awesome. Perfect pedal travel to modulate the braking. Excellent pedal feel.
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| tornik550 |
Aug 27 2016, 08:48 AM
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#6
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Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
QUOTE(Krieger @ Aug 27 2016, 10:32 AM)  I cannot remember for sure what the wide A was. If it is from the Carrera 84-89 I have the identicle set up front and rear. I selected the 19mm master based on a discussion with Eric Shea. Basically the front and rear pistons diameters are the same as porsche intended so you have the same front to rear bias. The results are nothing short of amazing. Stopping power is awesome. Perfect pedal travel to modulate the braking. Excellent pedal feel. Yes the wide A is from the 84-89 911. It sounds like you have the same setup as me. It feels like my pedal is a little spongy even though I have bled my brakes several times. I will try again. This may sound odd however I do not know what size of master cylinder I have. I installed a new master cylinder a few years back when I had a stock setup. I do not remember what size I installed. Is there a quick and easy way to differentiate a 17mm or 19mm mc while it is installed? |
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| VaccaRabite |
Aug 27 2016, 10:02 AM
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#7
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En Garde! Group: Admin Posts: 13,465 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
You have air trapped somewhere.
Your breaks should be rock hard when properly bled. |
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| GeorgeRud |
Aug 27 2016, 10:11 AM
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#8
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Advanced Member Group: Members Posts: 3,725 Joined: 27-July 05 From: Chicagoland Member No.: 4,482 Region Association: Upper MidWest |
I find that a drive on some bumpy roads after a brake bleeding seems to help get rid of those pesky air bubbles. Sure, you have to bleed the brakes twice, but the pedal does firm up nicely.
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