Wednesday 25th October 2006

Porsche track day coming up

Have a hoon in complete safety this December

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Bedford Autodrome

MotorSport Vision is offering Porsche drivers the chance to experience the ultra safe Bedford Autodrome at its Porsche-only track day. From a Porsche 924 to a 997 -- whatever Porsche you drive, you are welcome to attend.

• Where: Bedford Autodrome's 3.6 mile GT Circuit
• When: Friday 8 December
• Price: £120 per car.

Bedford Autodrome is one of the longest and safest trackday circuits in the country - the huge run off areas make it an ideal venue whether this is your first trackday or your 50th.

• www.motorsportvision.co.uk/porscheph

[porkerborg]

Anyone else up for this or have experience of this, should I have the brake fluid changed before or after, please don't say both!

[theboyfold]

porkerborg said:

Anyone else up for this or have experience of this, should I have the brake fluid changed before or after, please don't say both!

Ideally both!! But it depends on how hard you drive and what type you have in. There are loads of threads debating what type of fluid to use. In my humble Pug I run with Dot 5.1 (don't confuse this with Dot 5), which is better then Dot 4!! I've managed to boil some of the 5.1 off, and it resulted in a softer slower responding peddle, but I just topped it back up and it seemed ok.

As a rule it looks like I'm going to have to change it every 3 or 4 track days as it's getting progressivly worse after each top up...

[richardb.jones]

theboyfold said:

porkerborg said:

Anyone else up for this or have experience of this, should I have the brake fluid changed before or after, please don't say both!

Ideally both!! But it depends on how hard you drive and what type you have in. There are loads of threads debating what type of fluid to use. In my humble Pug I run with Dot 5.1 (don't confuse this with Dot 5), which is better then Dot 4!! I've managed to boil some of the 5.1 off, and it resulted in a softer slower responding peddle, but I just topped it back up and it seemed ok.

As a rule it looks like I'm going to have to change it every 3 or 4 track days as it's getting progressivly worse after each top up...

?

The minimum spec of DOT 5.1 is indeed higher than DOT4 but we all know that a decent DOT4 racing fluid (RBF600 etc) will outperform 5.1 - it's all to do with the dry(new) and wet(used) boiling points.

It is impossible to 'boil' brake fluid off - the only bit that gets hot is the calipar, you can boil the brake fluid of course but that simply creates air bubbles that are compressible in the calipar piston area, hence your soft pedal. By topping up the resevoir you will not reduce the problem - you'll need to bleed the air out of the system - (in the process of bleeding you will lose fluid - maybe that's what you meant ?) If you're losing fluid without bleeding, then I suggest getting it checked out soonest ...

A quick bleed after every track day should suffice, flushing the whole system is overkill IMO ...