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Author Subject: Odd brake pedal feel
Chr1sch

Seasoned Pro

Location: Worcester

Registered: 02 Aug 2014

Posts: 1,025

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Post #1
Hi Gents

After all my praising of the newly revitalized brake setup (HiSpec Billet 300's, Tarox Discs, DS2500's, Braided Hoses and Blue wotsit fluid) following my trackday last week i've started the car up and the first inch of brake pedal travel is totally floppy - i mean its dead travel.

If i then push harder it stops like a rocket as normal, however its not safe having such a dead zone! Have i just boiled the fluid? (i cant see any leaks etc) or could it be servo related or something?

Posted 27th Feb 2015 at 11:06
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Chr1sch

Seasoned Pro

Location: Worcester

Registered: 02 Aug 2014

Posts: 1,025

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Post #2
Bled then and still feel off, annoyingly the one rear calliper nipple has snapped off so I guess it could be that?!
Posted 28th Feb 2015 at 19:23
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devere

Senior User

Location: Saxtead

Registered: 16 Dec 2008

Posts: 810

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Post #3
I changed to a bigger master cylinder when I fitted my ap 4 pots. Removed any slack in the pedal that was brought on by the bigger calipers.
Posted 28th Feb 2015 at 19:31
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Chr1sch

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Location: Worcester

Registered: 02 Aug 2014

Posts: 1,025

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Post #4
Interesting what did you change to?
Posted 28th Feb 2015 at 23:27
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devere

Senior User

Location: Saxtead

Registered: 16 Dec 2008

Posts: 810

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Post #5
Master cylinder from a vw transporter. If I remember rightly it is 25.4mm compared to about 23mm the standard 6 master cylinder.

The only real difference fitment wise, is that the ports are on the opposite side, so the brake lines need extending.

Bearing in mind tho, I had no abs. So this was a 2 port cylinder rather than a 4.
Posted 28th Feb 2015 at 23:35
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fatlapit

Seasoned Pro

Location: STOCKSFIELD

Registered: 02 Nov 2010

Posts: 3,040

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Post #6
strange i run aps and standard mc mines fine

if u replace all the copper with braided u can get a wierd pedal

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Posted 1st Mar 2015 at 00:17
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bigbadbowen

Seasoned Pro

Location: Winchester

Registered: 21 Nov 2003

Posts: 13,753

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Post #7
Chr1sch wrote:
Hi Gents

After all my praising of the newly revitalized brake setup (HiSpec Billet 300's, Tarox Discs, DS2500's, Braided Hoses and Blue wotsit fluid) following my trackday last week i've started the car up and the first inch of brake pedal travel is totally floppy - i mean its dead travel.

If i then push harder it stops like a rocket as normal, however its not safe having such a dead zone! Have i just boiled the fluid? (i cant see any leaks etc) or could it be servo related or something?



Sounds like air in the system to me Yes
Posted 1st Mar 2015 at 01:53
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RetroPug

Seasoned Pro

Location: Leicestershire

Registered: 15 Jan 2013

Posts: 2,473

Status: Offline
Post #8
bigbadbowen wrote:
Chr1sch wrote:
Hi Gents

After all my praising of the newly revitalized brake setup (HiSpec Billet 300's, Tarox Discs, DS2500's, Braided Hoses and Blue wotsit fluid) following my trackday last week i've started the car up and the first inch of brake pedal travel is totally floppy - i mean its dead travel.

If i then push harder it stops like a rocket as normal, however its not safe having such a dead zone! Have i just boiled the fluid? (i cant see any leaks etc) or could it be servo related or something?



Sounds like air in the system to me Yes


Agreed, I'd try re-bleeding first.

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Posted 1st Mar 2015 at 07:23
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armzsc6

Seasoned Pro

Location: Crowborough

Registered: 22 Mar 2008

Posts: 3,445

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Post #9
Yup, everyone moans about a poor pedal when fitting 4 pots.... I tend to moan about their poor bleeding lol mines spot on.

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Posted 1st Mar 2015 at 09:02
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Chr1sch

Seasoned Pro

Location: Worcester

Registered: 02 Aug 2014

Posts: 1,025

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Post #10
haha well I guess i need to get the rear calipers refurbished first and re-bleed before worrying much more....

It still stops on a dime when pushed hard
Posted 1st Mar 2015 at 12:42
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devere

Senior User

Location: Saxtead

Registered: 16 Dec 2008

Posts: 810

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Post #11
I bled my 4 pots on a regular basis after events to refresh the fluid at the caliper. Always bled them correctly. Its just a fact I had a better pedal with the bigger master cylinder. Someone else also had an improvement also. Different calipers and different effects im sure. But some things work for one person and not for another.
Posted 1st Mar 2015 at 12:54
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adam b

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Location: The Nam

Registered: 24 Jan 2006

Posts: 12,828

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Post #12
Depends on the piston size in the calipers Smile

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Posted 1st Mar 2015 at 14:31
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Niall

Seasoned Pro

Location: Epsom

Registered: 06 Jun 2012

Posts: 1,941

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Post #13
Yeah 4 pots can be a bit of a bas**rd to bleed. When i first fitted my Hispecs, i think it took 3 or 4 attempts before it felt spot on.
I found though with my Hispecs, i had a long pedal travel yet went to the brembos with a gti6 MC and its fine!
Posted 1st Mar 2015 at 17:09
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