displaying posts 1 to 14 of 14

Author Subject: Master Cylinder Change ? Help ?
steve h gti-6

Seasoned Pro

Location: Carterton

Registered: 04 Dec 2006

Posts: 1,583

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Post #1
Is changing the brake master cylinder as easy as it sounds in the Haynes manual ?

A. Bleed brake fluid out of the system
B. Remove the brake fluid resevoir
C. Disconnect the brake pipes off the MS using an 11mm Flaired spanner to stop any rounding of the nuts.
D. Undo the two securing nuts to the servo 13mm i think ?
E. Withdrawl the MS.
F. Refit new MS with new O-Ring without damaging the new MS shaft.
G. Tighten all back up, with new nuts etc
H. Refit fluid resevoir, refill with fresh brake fluid and give it a good bleed through.

Job Done, or is this too easy too be true and im missing something ???????????

I have a Phase 3 99 T Plate GTi-6

________________________________________

"Gotta Love The 6"

According to my wife i think the 6 is the fastest car in the world, perhaps she is right LoL !
Posted 18th Mar 2009 at 19:44
phillipm

Seasoned Pro

Location: Rotherham

Registered: 15 Oct 2006

Posts: 20,607

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Post #2
Pretty much Thumbs up

Just watch the ends of the copper pipes don't twist off due to corrosion on the fittings.

________________________________________

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Posted 18th Mar 2009 at 19:59
steve h gti-6

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Location: Carterton

Registered: 04 Dec 2006

Posts: 1,583

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Post #3
phillipm wrote:
Pretty much Thumbs up

Just watch the ends of the copper pipes don't twist off due to corrosion on the fittings.


Ill be carefull there and take care in what im doing. Would WD40ing them the night before help do you think ?

________________________________________

"Gotta Love The 6"

According to my wife i think the 6 is the fastest car in the world, perhaps she is right LoL !
Posted 18th Mar 2009 at 20:10
Scrompy

Aka Quagmire83

Location: Warrington

Registered: 02 Apr 2007

Posts: 2,900

Status: Offline

Post #4
Theres no need to drain the fluid out of the system.

1. Undo the 2 brake lines on the MC (11mm) use a rag to catch any excess fluid.
2. Undo the 2 bolts holding it to the servo. (13mm)
3. Pull the master cylinder out of the servo and place it upsidedown into a container or onto an old towel.
4. Pull out the sirclip and pin that holds the resovoir to the MC and fit the new MC to the resovoir.
5. Refit to the car and bleed the brakes.

If you drain all the fluid out of the system before doing this as Haynes suggests it will make it a pain in the arse to get all the air out of the brakes.

________________________________________


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Posted 18th Mar 2009 at 21:48
steve h gti-6

Seasoned Pro

Location: Carterton

Registered: 04 Dec 2006

Posts: 1,583

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Post #5
Scrompy wrote:
Theres no need to drain the fluid out of the system.

1. Undo the 2 brake lines on the MC (11mm) use a rag to catch any excess fluid.
2. Undo the 2 bolts holding it to the servo. (13mm)
3. Pull the master cylinder out of the servo and place it upsidedown into a container or onto an old towel.
4. Pull out the sirclip and pin that holds the resovoir to the MC and fit the new MC to the resovoir.
5. Refit to the car and bleed the brakes.

If you drain all the fluid out of the system before doing this as Haynes suggests it will make it a pain in the arse to get all the air out of the brakes.


Ill do that then, as you have clearly done it before

CheersCool

________________________________________

"Gotta Love The 6"

According to my wife i think the 6 is the fastest car in the world, perhaps she is right LoL !
Posted 18th Mar 2009 at 23:13
phillipm

Seasoned Pro

Location: Rotherham

Registered: 15 Oct 2006

Posts: 20,607

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Post #6
It'll take a while to bleed anyway as the master cylinder takes longer to bleed than the lines and calipers anyway.

Best bet is to fill it up and bleed the cylinder before you bolt it on, helps cut down on the amount of time.

________________________________________

- Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM me
Email me!
Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces.
Posted 18th Mar 2009 at 23:17
smegal

Seasoned Pro

Location: Leeds

Registered: 26 Dec 2005

Posts: 5,940

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Post #7
Check your rear bleed nipples turn first.

________________________________________

Ex SC-6

Now in a Megane R26
Posted 18th Mar 2009 at 23:19
lotek

Seasoned Pro

Location: Berkshire

Registered: 04 Dec 2007

Posts: 6,107

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Post #8
smegal wrote:
Check your rear bleed nipples turn first.




X 2 im 70% sure they wont
Posted 18th Mar 2009 at 23:23
steve h gti-6

Seasoned Pro

Location: Carterton

Registered: 04 Dec 2006

Posts: 1,583

Status: Offline

Post #9
lotek wrote:
smegal wrote:
Check your rear bleed nipples turn first.




X 2 im 70% sure they wont


They are all fine as i did a bleed last week while un-seizing the rear calipers. I thought after that and a good bleed, it would be back to being 100%.....NOT.....Sad

So i tested the Vacuum Servo Unit and the Vacuum Servo Check valve and they operatre as they should do, it could only be one thing left...The MS. Got a new OE Pug one sitting around so may as well just change the whole thing over together with a new O-Ring.

Never rains but it pours with a 6LOL

________________________________________

"Gotta Love The 6"

According to my wife i think the 6 is the fastest car in the world, perhaps she is right LoL !
Posted 19th Mar 2009 at 01:38
buzzbrightyear

Seasoned Pro

Location: hiding all receipts for car

Registered: 09 Jul 2008

Posts: 11,901

Status: Offline

Post #10
does anybody know a part number for the seal that seals the reservoir to the master cylinder as pug are trying to sell me a master cylinder for it!!!

________________________________________

andrew315rawson@live.co.uk
Moonstone phase 7 gti6
My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1
Posted 7th Jan 2010 at 19:53
rikky 🦔

Location: cheshire

Registered: 28 Feb 2004

Posts: 26,795

Status: Offline

Post #11
http://www.306gti6.com/forum/showthread.php?id=115878&page=1

you can't buy the seal on it's own from pug

i bet brakeparts could get one

________________________________________

306 rallye reproduction decals (full sets/individual decals) | 306 b-pillar textured vinyl weatherstrips
306 slam panel esso stickers | 306 yellow / orange / pension fund red side door badges
gti6 inlet manifold badges | 306 rear boot badges (p2/p3)
winner of Extraction of toys from prams with outstanding vigour award 2009 [source: gti6 owners club]
Posted 7th Jan 2010 at 20:02
buzzbrightyear

Seasoned Pro

Location: hiding all receipts for car

Registered: 09 Jul 2008

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Post #12
thanks for the link matey.

________________________________________

andrew315rawson@live.co.uk
Moonstone phase 7 gti6
My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1
Posted 7th Jan 2010 at 20:04
rikky 🦔

Location: cheshire

Registered: 28 Feb 2004

Posts: 26,795

Status: Offline

Post #13
oh you f*cking bas**rd, look what i found:

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=270353269572

20quid though, new MC is only 60ish...

edit> that's the wrong diameter Hmm but i bet they could get the gti6 ones..

that's for ATE not Bosch but nothing on mine is leaking except what looks like the bigger seal that goes on the back of the MC

edit2> rang them again [biggred] and they do the kit i am after for

________________________________________

306 rallye reproduction decals (full sets/individual decals) | 306 b-pillar textured vinyl weatherstrips
306 slam panel esso stickers | 306 yellow / orange / pension fund red side door badges
gti6 inlet manifold badges | 306 rear boot badges (p2/p3)
winner of Extraction of toys from prams with outstanding vigour award 2009 [source: gti6 owners club]
Posted 7th Jan 2010 at 20:45
buzzbrightyear

Seasoned Pro

Location: hiding all receipts for car

Registered: 09 Jul 2008

Posts: 11,901

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Post #14
mines fine, i just noticed it weeping before under the reservoir

________________________________________

andrew315rawson@live.co.uk
Moonstone phase 7 gti6
My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1
Posted 7th Jan 2010 at 20:54

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