Welcome to 911UK
The only place for Porsche, 911uk is the definitive enthusiast and resource site for the Porsche 911.
Registration is fast, simple and absolutely free, so join up today for full access to the site and benefit from latest member offers.

Porsche Classifieds
Sell Your Porsche on 911uk
Create a Free Classified Advert
Search Ads
Classified Adverts FAQ
Trade Classified Information
Buyer & Seller Fraud Protection
Consumer Rights Act
Pre Purchase Inspection (PPI)
Porsche Car Sourcing
Porsche Cars Wanted
Official Porsche Centre Reviews
Model
Stock
Porsche 911
992 : 2019- 0
991 : 2011- 21
997 : 2004- 61
996 : 1997-2005 32
993 : 1993-1998 4
964 : 1989-1993 0
Carrera 3.2 : 1983-1989 2
Carrera SC : 1977-1983 1
930 Turbo : 1975-1989 1
Early 911 : 1964-1977 1
Porsche Other Models
Classic : 1950-1965 0
Boxster : 1997- 26
Cayman : 2005- 20
Cayenne : 2003- 5
Macan : 2014- 3
Panamera : 2009- 0
912-914-924-928-944-968 0
959 - CarreraGT - RaceCar 0
Car Parts For Sale & Wanted
Other Items For Sale & Wanted
Wheels Tyres For Sale & Wanted
Number Plates For Sale Wanted

Porsche Services
Porsche Body Shop Repair
Paint Protection & Wrapping
Porsche Classic Insurance
Porsche Classic Parts
Porsche Classic Restoration
Porsche Design Collection
Porsche Engine Gearbox Rebuild
Porsche Heritage & History
Porsche News
Porsche Picture Gallery
Win a New Porsche 911

Porsche Parts
Body Parts, Body Styling
Brakes, Clearance
Electrical, Exhausts
Engine Cooling, Engine Electrical
Engine Rebuild, Heating Cooling
Interior Incar, Lighting
Rubber Seals, Service Parts
Steering, Suspension
Transmission, Workshop Tools
Early 911, 911 - 930, 928 - 968
964 - 993, 996 - 997, Boxster
Cayman, Cayenne, Panamera

Porsche Model Range
911 [992] 2018-Current
Porsche 911 [992]
911 [991] 2011-2019
Porsche 911 [991]
911 [997] 2004-2012
Porsche 911 [997]
911 [GT] GT1-GT2-GT3
Porsche 911 [GT]
911 [996] 1997-2005
Porsche 911 [996]
911 [993] 1993-1998
Porsche 911 [993]
911 [RS] RS-RSR
Porsche 911 [RS]
911 [964] 1989-1993
Porsche 911 [964]
911 3.2 1983-1989
Porsche 911 3.2 Carrera
911 SC 1977-1983
Porsche 911 SC
911 [Early] 1964-1977
Porsche 911 [Early]
Boxster & Cayman
Porsche Boxster & Cayman
Cayenne & Panamera
Porsche Cayenne & Panamera

911uk Site Partners

Post new topic   Reply to topic
Author Message
NedHan79
Hockenheim


Joined: 08 Nov 2018
Posts: 714



PostPosted: Tue Jan 07, 2020 10:56 pm    Post subject: 997 gt3 brake master cylinder upgrade Reply with quote

Is there any point in opting for the larger 27mm 997 gt3 brake master cylinder? I’m pretty much re-piping the whole car so bleedings not gona be an issue. I’ve found that trw make the part and can be bought from AUTODOC for £76 iirc. Thats if I can figure out how to bypass the registration part that brings up my c2s details.lol.

Any one done this?
The rest of the brake set up is standard btw. Atm at least
_________________
#modified996mk1
 
  
View user's profile Send private message
   
skinny_monkey
Nürburgring


Joined: 16 Sep 2014
Posts: 472



PostPosted: Tue Jan 07, 2020 11:17 pm    Post subject: Reply with quote

Depends what you're looking for. It will (afaik) give you a stiffer pedal / less movement for a given brake pressure.

I think you'll probably need some new pipes made up out of the m/c.

BTW, i've heard of this being done with the 996 gt3 m/c but not the 997 but i could well be wrong. In fact, i have a GT3 M/C waiting to go on (well it's the equivalent TRW, i think it was the same as some Audi)

Last edited by skinny_monkey on Wed Jan 08, 2020 1:33 pm; edited 1 time in total
 
  
View user's profile Send private message
   
NedHan79
Hockenheim


Joined: 08 Nov 2018
Posts: 714



PostPosted: Wed Jan 08, 2020 6:22 am    Post subject: Reply with quote

On a quick google I get 997 results coming up first. I’ve always found the brakes disappointing so this is the first logical step seeing as I have the car in bits and the rest of the pipes off
_________________
#modified996mk1
 
  
View user's profile Send private message
   
crash7
Hockenheim


Joined: 28 May 2011
Posts: 688



PostPosted: Wed Jan 08, 2020 9:55 am    Post subject: Reply with quote

Yes it can be done, as Skinny says you will get shorter pedal travel. - You will need a custom brake pipe made.

Does your car have PSM? If so it wont like the GT3 master cylinder and will constantly be in fault mode.

It can be rectified by adding a brake bias valve to reduce the flow to the rear calipers.
 
  
View user's profile Send private message
   
NedHan79
Hockenheim


Joined: 08 Nov 2018
Posts: 714



PostPosted: Wed Jan 08, 2020 10:21 am    Post subject: Reply with quote

Hi crash. No psm. Mines an early car so it’s pretty basic. Making a new pipe wouldn’t be any bother at al so I’ll maybe get one and give it a go. This would be the time to do it
_________________
#modified996mk1
 
  
View user's profile Send private message
   
RXBoxster
Monza


Joined: 31 Jul 2015
Posts: 239
Location: Preston - Lancashire


PostPosted: Wed Jan 08, 2020 10:29 am    Post subject: Reply with quote

It will just make it harder to press the pedal,
 
  
View user's profile Send private message
   
Stuart
General
General


Joined: 16 Sep 2007
Posts: 5088
Location: Waterworld

2004 Porsche 996 GT3 Mk2

PostPosted: Wed Jan 08, 2020 1:09 pm    Post subject: Reply with quote

I fitted the 997 master cylinder to my 996.2GT3, firmer brake feel, more confidence, easier to H&T. It's a known 'upgrade' for the 996GT3. I bought part number TRW PMN166
 
  
View user's profile Send private message
   
skinny_monkey
Nürburgring


Joined: 16 Sep 2014
Posts: 472



PostPosted: Wed Jan 08, 2020 1:38 pm    Post subject: Reply with quote

NedHan79 wrote:
On a quick google I get 997 results coming up first. I’ve always found the brakes disappointing so this is the first logical step seeing as I have the car in bits and the rest of the pipes off

In what way do you find the brakes disappointing? If it's that they feel lifeless / wooden / need a hard shove (all common comments) then the gt3 m/c will make all these things worse.
 
  
View user's profile Send private message
   
NXI20
Paul Ricard


Joined: 02 Feb 2008
Posts: 3398
Location: South Bucks

2004 Porsche 996 GT3 Mk2

PostPosted: Wed Jan 08, 2020 2:29 pm    Post subject: Reply with quote

The MC / brake piston size ratio will be wrong if you're using the standard 4-pot calipers on the front. The bigger master cylinder piston size works OK on the 6-pot calipers (more fluid needed to move all 6 pistons) but I suspect you'll just wind up with a really hard pedal that's difficult to modulate and lacks feel.
_________________
Nick

2004 GT3 CS in Atlas Grey with too many mods to list!
1995 993 GT2 recreation in Polar Silver
2010 GT3 CS in Riviera Blue Smile
 
  
View user's profile Send private message
   
NedHan79
Hockenheim


Joined: 08 Nov 2018
Posts: 714



PostPosted: Wed Jan 08, 2020 11:00 pm    Post subject: Reply with quote

All very interesting points. I’ve never had any faith in the brakes but that’s maybe more down to old Tyres and lack of grip.

I had just started to get the hang of heel and toe just before I took the car off the road. Had thought the master cylinder would have helped me get on with it Question
_________________
#modified996mk1
 
  
View user's profile Send private message
   
Chris_in_the_UK
Estoril


Joined: 19 Mar 2014
Posts: 3595
Location: Harrogate


PostPosted: Wed Jan 08, 2020 11:42 pm    Post subject: Reply with quote

Known (good) modification for 6 pot front brakes - done it on my Cayman which has PCCB's.

Better pedal feel and proportionate braking.
_________________
2006 Cayman S PCCB's
 
  
View user's profile Send private message
   
RXBoxster
Monza


Joined: 31 Jul 2015
Posts: 239
Location: Preston - Lancashire


PostPosted: Thu Jan 09, 2020 9:41 am    Post subject: Reply with quote

You could always put a bias box in there, and have some properly adjustable brakes Smile
 
  
View user's profile Send private message
   
NedHan79
Hockenheim


Joined: 08 Nov 2018
Posts: 714



PostPosted: Thu Jan 09, 2020 10:26 am    Post subject: Reply with quote

Think I’ll stick with the gt3 item Very Happy
_________________
#modified996mk1
 
  
View user's profile Send private message
   
Display posts from previous:   
Post new topic   Reply to topic   All times are GMT - 12 Hours
Page 1 of 1

 
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You can attach files in this forum
You can download files in this forum
You cannot post calendar events in this forum